CN104594956A - Structure for improving air film cooling efficiency of downstream wall surface of slotted air film hole - Google Patents
Structure for improving air film cooling efficiency of downstream wall surface of slotted air film hole Download PDFInfo
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- CN104594956A CN104594956A CN201510069092.3A CN201510069092A CN104594956A CN 104594956 A CN104594956 A CN 104594956A CN 201510069092 A CN201510069092 A CN 201510069092A CN 104594956 A CN104594956 A CN 104594956A
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Abstract
The invention relates to a structure for improving the air film cooling efficiency of a downstream wall surface of a slotted air film hole. The structure comprises an air film hole, a transverse slot and a wall surface, wherein the transverse slot is formed in the upstream area of the wall surface; the air film hole is positioned in the transverse slot. The structure is characterized in that a bump is arranged on the downstream area of the wall surface, is symmetrically arranged by taking a straight line passing through the center of an outlet of the air film hole and perpendicular to the wall surface as an axis, and is provided with an air inlet in the direction leading to the air film hole and an air outlet in the opposite direction, wherein the profile of the side, back on to the air film hole, of the bump is a back pressure profile, and the profile of the side, leading to the air film hole, of the bump is a windward profile; the back pressure profile is a profile protruded towards the downstream of the wall surface; the length of the air inlet is 2 to 5 times the aperture of the air film hole, and is 1.5 to 4 times that of the air outlet; the ratio of the distance between the air inlet of the bump to the center of the outlet of the air film hole to the aperture of the air film hole is 10 to 30; the ratio of the height of the bump to the aperture of the air film hole is 0.25 to 3.
Description
Technical field
The present invention relates to gas turbine heat transfer and cooling technology field, be specifically related to a kind of structure improving fluting air film hole downstream wall gas film cooling efficiency.
Background technique
Gas turbine is widely used in fields such as aviation, generating, chemical industry, energy and power engireering, effectively can increase the thermal efficiency and the power stage of gas turbine by improving turbine rotor inlet temperature.Current advanced combustion gas turbine inlet temperature has exceeded 2000K, than fusing point more than the height 400K of high-pressure turbine blade metallic material, solves high temperature and brings the way of problem mainly develop high performance heat resistant alloy and adopt advanced cooling technology.The technical progress of metal current material aspect does not catch up with the increase trend of engine turbine inlet temperature far away, therefore still needs to take corresponding cooling method to protect hot-end component.In the cooling system of existing gas turbine blades, gaseous film control is the cooling technology of most application prospect.
Adopt the air film cooling technology of the fluting film hole structure of arranged downstream projection, existing being just developed improves the protection of gas turbine turbine blade wall cooling.Now there are some researches show that fluting film hole structure has good gaseous film control performance.Fluting air film hole can reduce the momentum of air film hole outlet port cooling blast, improves gas film cooling efficiency, reduces surface film thermal conductance, and then reduces surface heat flow ratio.After fluting, the sensitivity of cooling effectiveness to air blowing ratio decreases.It is the average gas film cooling efficiency adopting rational structure increase raising horizontal and vertical for the key issue improving discrete holes downstream cooling effect.The method that prior art adopts mainly contains following two focus: one is based on transversal slotting structure, the object improving cooling effect is reached by adopting transversal slotting structure, two is the projections of arranging certain structure on the wall of downstream, increases the horizontal area coverage of air film and cool the effect being attached at wall by the projection of certain altitude.The Chinese patent being 200710017790.4 as number of patent application discloses a kind of grooving gaseous film cooling hole, but this Cooling Holes is to the horizontal cooling protection limited use in downstream, and during operating mode when air blowing ratio is greater than 1.0, cooling effect obviously declines.Number of patent application be 201010106756.6 Chinese patent disclose a kind of structure improving cooling efficiency of gas film of discrete hole; its deficiency is that this structure does not consider the superposition of gaseous film control transversal slotting to cooling; the structure of the projection of arranged downstream not still one; and close to air film hole; the inhibition that such convection current movable property is raw certain; the simultaneously protruding effect of raising makes to be exposed among high-temperature gas in the certain limit of protruding downstream, does not produce protective action to cooling air.
Summary of the invention
For the deficiencies in the prior art, the technical problem that quasi-solution of the present invention is determined is, provides a kind of structure improving fluting air film hole downstream wall gas film cooling efficiency.This structure is in order to improve the transverse direction of discrete holes gaseous film control and to open up to film overcast ability, Strengthening Hole downstream central region Film Cooling, obviously can promote the gas film cooling efficiency of gas turbine blade wall downstream area, be applicable to the air film cooling technology of all types of discrete holes distribution form with notching construction.
The present invention solve the technical problem adopted technological scheme: provide a kind of structure improving fluting air film hole downstream wall gas film cooling efficiency, comprise air film hole, transversal slotting and wall, transversal slotting is opened in wall upstream region, air film hole is positioned on transversal slotting, it is characterized in that the downstream area of described wall is provided with projection; Described projection is to cross air film hole export center and straight line perpendicular to wall is arranged for axisymmetric, the direction that projection is met to air film hole is suction port, opposite direction is air outlet, the described side molded line thrown one's back out to air film hole is back pressure molded line, the side molded line of meeting to air film hole is molded line windward, and described back pressure molded line is the molded line protruded to wall downstream direction; The length of described suction port is 2-5 times of the aperture of air film hole, and the length of suction port is 1.5-4 times of the length of air outlet; The protruding distance of suction port distance air film hole export center and the ratio in the aperture of air film hole are 10-30; The ratio in the height of described projection and the aperture of air film hole is 0.25-3.
Compared with prior art, the present invention adopts the method based on arranged downstream a pair arc convex of the air film hole of transversal slotting, namely each projection is made up of two arcs of symmetry, replace the projection of integrative-structure in prior art, first by this structure, horizontal forced collection effect is carried out to gaseous film control gas, improve the cooling effect of protruding upstream and inside, cooling air obtains sudden expansion after flowing out projection, and then the region cooling air coverage effect of rear raised portion is promoted further.The projection that the present invention adopts can not produce and cause rear raised portion region to lose cooling protection owing to raising cooling air; simultaneously; because projection is broken into layout; larger flow losses can not be produced; and enhance horizontal cooling effect; and also there is cooling effect when air blowing ratio is greater than 1.0, the cooling protection of gas turbine blade surface and end wall can be widely used in.In addition, the present invention also has the features such as beautiful shape, structure is simple, enforcement is convenient, with low cost, is more suitable for commercial Application.
Accompanying drawing explanation
Fig. 1 the present invention improves the overall structure schematic diagram of the structure of fluting air film hole downstream wall gas film cooling efficiency;
Fig. 2 the present invention improves the plan structure schematic diagram of a kind of embodiment of structure of fluting air film hole downstream wall gas film cooling efficiency;
Fig. 3 the present invention improves the main TV structure schematic diagram of a kind of embodiment of structure of fluting air film hole downstream wall gas film cooling efficiency;
Fig. 4 of the present invention protruding 3 improves the principle schematic of gas film cooling efficiency;
When Fig. 5 air blowing ratio is 0.5, temperature of zero dimension of the present invention is the contour surface profile diagram of 0.6;
When Fig. 6 air blowing ratio is 0.5, temperature of zero dimension of the present invention is the contour surface profile diagram of 0.2;
Fig. 7 air blowing ratio is 0.5, the cooling effectiveness distribution map of middle section, air film hole downstream, and wherein, Fig. 7 a air blowing ratio is 0.5, without time protruding, and the cooling effectiveness distribution map of middle section, air film hole downstream; Fig. 7 b air blowing ratio is 0.5, when having projection, the cooling effectiveness distribution map of middle section, air film hole downstream;
Fig. 8 air blowing ratio is 0.5, when wall sheet material is aluminium, and the coupling gas film cooling efficiency distribution map of middle section, air film hole downstream of the present invention;
The structure protrusions 3 that Fig. 9 the present invention improves fluting air film hole downstream wall gas film cooling efficiency is the plan structure schematic diagram of a kind of embodiment of prism-type;
The structure protrusions 3 that Figure 10 the present invention improves fluting air film hole downstream wall gas film cooling efficiency is the plan structure schematic diagram of a kind of embodiment of half bracket type topological resemblance structure;
In figure, 1-air film hole, 2-transversal slotting (or groove), 3-projection, the outlet of 4-wall, 11-air film hole, 31-back pressure molded line, 32-molded line, 33-suction port, 34-air outlet windward.
Embodiment:
Below in conjunction with embodiment and accompanying drawing, the present invention will be further described, but do not limit the protection domain to the claims in the present invention with this.
The structure that the present invention improves fluting air film hole downstream wall gas film cooling efficiency (is called for short structure, see Fig. 1-10) comprise air film hole 1, transversal slotting 2, projection 3 and wall 4, transversal slotting 2 is opened in wall 4 upstream region, air film hole 1 is positioned on transversal slotting 2, is provided with protruding 3 at the downstream area of wall 4; Described protruding 3 to cross the center of air film hole outlet 11 and the straight line perpendicular to wall 4 is arranged for axisymmetric, protruding 3 directions of meeting to air film hole are front portion, front portion is suction port 33, opposite direction is air outlet 34, the side molded line of described protruding 3 air film holes is dorsad back pressure molded line 32, the side molded line of meeting to air film hole 1 is molded line 31 windward, and described back pressure molded line 32 be the molded line to wall downstream direction protrusion; The length w of described suction port 33 is 2-5 times of the aperture d of air film hole 1, and the length of suction port 33 is 1.5-4 times of the length of air outlet 34; The ratio L/d that the suction port 33 of projection 3 exports the centre distance L of the 11 and aperture d of air film hole 1 apart from air film hole is 10-30; The ratio of the aperture d of the described height H of protruding 3 and air film hole 1 is 0.25-3.
Of the present inventionly be further characterized in that the described X of protruding 3 is 1.0-4.0 to the ratio of length w1 and Y-direction length w2.
Of the present inventionly be further characterized in that described protruding 3 is two arcs.
Of the present invention be further characterized in that described in windward molded line 31 be straight line or the camber line to wall downstream direction projection.
Of the present inventionly be further characterized in that described protruding 3 is half bracket type, prism-type or topological resemblance structure.
Of the present invention be further characterized in that described in the spacing b of molded line and back pressure molded line be windward adjustable.
Of the present inventionly be further characterized in that the groove width c of described transversal slotting 2 is 2-6 with the ratio of the aperture d of air film hole 1, the groove depth s of transversal slotting 2 is 0.2-1 with the ratio of the aperture d of air film hole 1.
Of the present inventionly be further characterized in that described air film hole 1 is for cylindrical, cone shape hole, rectangular opening, trapezoidal hole, dust-pan shaped hole or Console hole.
Of the present inventionly be further characterized in that described air film hole 1 angle β is with respect to the horizontal plane 15 °-60 °, the ratio e/d of the lateral length e of described wall 4 and the aperture d of air film hole 1 is 3-10.
The basic principle (see Fig. 4) that protrusions 3 of the present invention can improve air film hole downstream wall gas film cooling efficiency is: adopt the method arranging projection 3 in the downstream of air film hole 1, be arranged symmetrically with two projections that this projection 3 is separated in being, protruding shape can be arc can be also stepped shaft or helical type, but the overall trend that will ensure the back pressure molded line 32 of protruding 3 protrudes to wall downstream direction.First carry out horizontal forced collection effect by this projection 3 pairs of gaseous film control gas, part cooling air a is stopped by protruding 3, the cooling effect of upstream and inside is obviously promoted, and cooling total air flow g flows out protruding 3 rear portions and obtains sudden expansion, and the region cooling air coverage effect of rear raised portion is promoted further.Flow through the cooling air centrally alignment downstream flow of protruding 3, cooling air m spreads to both sides and has larger vorticity simultaneously, forms new diffusion effect.
In the present invention, air film hole 1 is horizontal arranged in rows, can be cylindrical or non-cylindrical profiled holes, as cone shape hole, rectangular opening, trapezoidal hole, dust-pan shaped hole, Console hole etc., the ratio e/d of the lateral length e of wall 4 and the aperture d of air film hole 1 is 3-10, and air film hole 1 angle β is with respect to the horizontal plane between 15 °-60 °; Be applicable to the surface of any favorable pressure gradient, comprise the curved surfaces such as various concave surface and convex surface, when its gaseous film control air blowing ratio is between 0.25-1.5, cooling effect is remarkable.
The present invention has the air film hole 1 arranged downstream projection 3 of groove (i.e. transversal slotting 2), be conducive to the gaseous film control coverage density improving center region, there is the effect of collecting and gathering near wall cooling air, protruding 3 rear portions have the phenomenon of sudden expansion simultaneously, improve the cooling effect in downstream with this further.This structure focus on protruding 3 height and the shape of Elongation (w1/w2), windward molded line 31 and back pressure molded line 32, the suction port 33 of protruding 3 export distance L, suction port length w and air outlet 34 length at 11 centers to air film hole, above parameter to cooling fluid to the flow direction of downstream wall, open up to the cooling effectiveness vertical with space, and vorticity size and turbulence intensity play vital effect.According to main flow reynolds number Re, Secondary Flow flow velocity and need the exhibition of cooling protection to the requirement with lateral separation; the ratio H/d of the protruding height H of 3 and the aperture d of air film hole 1 should between 0.25-3; when air blowing ratio is larger simultaneously, height H can correspondingly increase, otherwise reduces the height H of protruding 3.The height H of protruding 3 need meet following design principle: first, if cooling air need be met to downstream exhibition to the requirement spreading and spread with transverse direction simultaneously, also the surface of the projection 3 in downstream to be avoided to be exposed in high temperature main flow simultaneously, height H can be made to be no more than locality impact height that air film hole 1 sprays, otherwise will the horizontal coverage effect of cooling air be affected; The second, if laterally (i.e. Y-direction) air film hole hole trestle column is less, only need concentrates and improve air film hole 1 downstream central region cooling effect, then the height H that can arrange protruding 3 exceedes locality impact that air film hole 1 sprays highly; 3rd, the height of protruding 3 depends on the covering cooling effect of downstream cooling air, if be furnished with again air film hole arrange along flowing in very little region, downstream, then should reduce the height H of the projection 3 of downstream air film hole; 4th, the height H of protruding 3 depends on upstream fluid speed (comprising the flow velocity of main flow reynolds' number and Secondary Flow cooling air), and the height H of protruding 3 increases according to its flow velocity and needs to reduce.
Embodiment 1
In the present embodiment, this structure (see Fig. 1-3) comprises air film hole 1, transversal slotting 2, projection 3 and wall 4, projection 3 is positioned at the downstream direction of wall 4, protruding 3 is two and half bracket type circular arcs, two circular arcs are to cross air film hole and export 11 centers and straight line perpendicular to wall 4 is arranged for axisymmetric, protruding 3 directions of meeting to air film hole 1 are front portion, front portion is suction port 33, opposite direction is air outlet 34, the side molded line of described protruding 3 air film holes is dorsad back pressure molded line 32, the side molded line of meeting to air film hole 1 is molded line 31 windward, back pressure molded line 32 and windward molded line 31 are circular arc line.In figs. 2 and 3, three flow directions represent with coordinate X, Y, Z respectively, X is for flowing to, X positive axis is downstream direction, Y is laterally, Z is vertical walls direction, the aperture of air film hole 1 represents with d, and air film hole 1 angle is with respect to the horizontal plane β, and air film hole exports 11 centers and represents with L with the distance of protruding suction port 33, the lateral length of wall 4 is e, b is the spacing of molded line 31 and back pressure molded line 32 windward, definite value or variate, and b is certain value in the present embodiment, namely half bracket type circular arc has uniform thickness, and the less cooling effect of this thickness is better.The groove width of transversal slotting 2 and groove depth represent with c, s respectively.The height of protruding 3 is H, and the length of protruding suction port 33 is w, and the X of protruding 3 is w1 to length, and protruding Y-direction length is w2, w1/w2 can strengthen the congregational rate of cooling air when being less ratio, and then significantly strengthens cooling effect.
In the present embodiment, air film hole 1 is cylindrical, and air film hole 1 angle β is with respect to the horizontal plane 30 °, and the ratio of the lateral length e of described wall 4 and the aperture d of air film hole is 7, and the length w of suction port 33 is 3 times of the aperture d of air film hole 1.The length of suction port 33 is 2 times of the length of air outlet 34; The ratio L/d that the suction port of projection 3 exports the aperture d of 11 centre distance L and air film hole 1 apart from air film hole is 15; The X of protruding 3 is 1.5 to the ratio of length w1 and Y-direction length w2, and the ratio of the projection height H of 3 and the aperture d of air film hole 1 is 1.The groove width c of transversal slotting 2 is 3 with the ratio of the aperture d of air film hole 1, and the groove depth s of transversal slotting 2 is 0.5 with the ratio of the aperture d of air film hole 1.
Adopt the structure in the present embodiment, carry out Film Cooling experiment when air blowing ratio is 0.5.The contour surface profile diagram that Fig. 5 is temperature of zero dimension when being 0.6, clearly demonstrates the coverage area of gaseous film control when this projection 3 obtains higher temperature of zero dimension (value is 0.6) in Fig. 5.First cooling blast flows into groove 2, stronger temperature of zero dimension area of influence follows the flow trace of cooling air, the last one cooling effect band is there is in air film hole 1 downstream, and spread to downstream by protruding 3, there is the high-energy surface of cooling action simultaneously in channel wall 4 plate, show that this structure can provide the savings of cooling capacity extremely strong in plate.Be not communicated with due to of the present invention protruding 3, but occur in pairs, therefore the flow resistance produced is less, is conducive to cooling air and spreads to downstream.The contour surface profile diagram that Fig. 6 is temperature of zero dimension when being 0.2; clearly show in Fig. 6 that cooling air diffusion zone is larger; no longer only follow cooling air flow trace; transverse area scope is also increased; make air film hole downstream very large regions obtain cooling protection; though flowing slightly raises up after flowing through protruding 3; but the cooling air in region attaches wall 4 successful between air film hole 1 downstream to protruding 3; simultaneously owing to obtaining the diffusion of protruding 3 rear portion sudden expansions; cooling coverage area expands further, has good cooling effect.Comprehensive analysis Fig. 5 and Fig. 6, clearly can find the downstream wall cooled region that this structure not only can provide larger, and make adjacent wall inner product store larger cooling capacity.Fig. 5 shows the higher situation of temperature of zero dimension isopleth, and make the larger cooling capacity of the savings in wall, Fig. 6 shows the lower situation of temperature of zero dimension isopleth, and this structure has larger transverse direction cooling diffusion.
Adopt the structure in the present embodiment, but do not arrange protruding 3, the cooling effectiveness of middle section, air film hole downstream is studied (see Fig. 7 a) when air blowing ratio is 0.5, middle section herein generally represents: the Normal plane on wall center line, also can be regarded as perpendicular to wall direction, be projected in the plane that the straight line on wall overlaps with wall center line.With very high cooling capacity when cooling air flows out from air film hole 1 in figure 7 a, arrive downstream wall gas film cooling efficiency through groove structure (transversal slotting 2) sharply to decline, temperature isopleth is 0.6, shows that the structure itself only with transversal slotting has certain cooling capacity.Adopt the structure in the present embodiment, air film hole 1 downstream is provided with protruding 3, studies the cooling effectiveness (see Fig. 7 b) of middle section, air film hole downstream when air blowing ratio is 0.5.Can know from Fig. 7 b and find out that cooling air is after priority effluent gases fenestra and groove, downstream wall releases cooling twice ability, compared to Fig. 7 a, obtain larger cooling energy core, namely temperature isopleth occurs 0.65, the higher cooling effect of temperature isopleth numerical value is better, isopleth is closeer also shows that cooling capacity is put aside, and it is better at horizontal direction diffusion effect, also stronger downstream diffusion and cooling capacity is just had, make to occur a cooling layer near near wall, near the impact of this cooling layer, the surface temperature of wall, adds wall cooling effect.Therefore, comparison diagram 7 and prior art known, only adopt transversal slotting or only adopt protruding structure itself to have certain cooling effect, and projection 3 and groove 2 are combined use time, temperature of zero dimension isopleth improves 0.05, and the temperature of zero dimension isopleth obtained is denser, illustrate the present invention in terms of existing technologies cooling effect be significantly improved, and lateral diffusion Be very effective.
Adopt the structure of the present embodiment, air blowing ratio is 0.5, when wall 4 is sheet material aluminium, and cooling effectiveness distribution (see Fig. 8) of research middle section, air film hole 1 downstream.Fig. 8 is clear to be illustrated in actual applications, when the material considering sheet material is metallic aluminium, after the gaseous film control invigoration effect of protruding 3 is combined with metal heat-conducting ability, significantly improves the Film Cooling in extremely protruding 3 intervals, air film hole 1 downstream.Cooling air, after effluent gases fenestra 1, carries maximum cooling capacity in groove, and the cooling capacity flowing to cooling air during air film hole 1 downstream surface declines very soon.After this, new high-octane cooling zone is obtained nearby at downstream wall, there is a coolant core (region of 0.8 appears in temperature isopleth), isopleth is more frequent shows that lateral diffusion effect is able to remarkable enhancing, temperature dimensionless isopleth 0.8,0.75,0.7 has been there is successively between from air film hole to projection, this shows when in conjunction with actual metal wall structure, this architecture provides stronger cooling effect, the capacity of heat transmission is enhanced, and convection heat exchange ability obtains declining (object of air film cooling technology).Meanwhile, the cooling capacity of cooling air maintains the initial ability of air film hole exit position, and defines special cooling protective layer near the near wall of downstream, and this cooling protective layer spreads to the position at protruding 3 places always.The effect of gathering of the collection cooling air due to protruding 3 obviously; cooling air is made to obtain enrichment in wall area; especially the downstream central region representated by middle section obtains stronger cooling protection; make the cooling effect of near wall improve 23% (temperature dimensionless number is from 0.65 to 0.8) further in conjunction with the structure of the present invention after the metal heat-conducting ability in practical application, hinge structure achieves comparatively much progress.
Embodiment 2
Identical with embodiment 1 of the position of each several part and annexation in the described structure of the present embodiment.The present embodiment protrusions 3 is two helical type projections, two helical type projections are to cross air film hole and export 11 centers and straight line perpendicular to wall 4 is arranged for axisymmetric, protruding 3 directions of meeting to air film hole 1 are front portion, front portion is suction port 33, opposite direction is air outlet 34, the side molded line of described protruding 3 air film holes is dorsad back pressure molded line 32, the side molded line of meeting to air film hole 1 is molded line 31 windward, back pressure molded line 32 is helical and protrudes to wall downstream, molded line 31 is circular arc line and protrudes to wall downstream windward, the spacing of molded line 31 and back pressure molded line 32 is adjustable windward, reduce gradually to air outlet 34 end spacing near suction port 33 end, namely the thickness of helical type projection gradually changes.
In the present embodiment, air film hole 1 is cylindrical, air film hole 1 angle β is with respect to the horizontal plane 15 °, the ratio of the lateral length e of described wall 4 and the aperture d of air film hole is 3, and the length w of suction port is 2 times of the aperture d of air film hole 1, and the length of suction port 33 is 1.5 times of the length of air outlet 34; The ratio L/d that protruding suction port 33 exports the distance L at 11 centers and the aperture d of air film hole 1 apart from air film hole is 10; The X of protruding 3 is 1.0 to the ratio of length w1 and Y-direction length w2, and the ratio of the projection height H of 3 and the aperture d of air film hole 1 is 0.25.The groove width c of transversal slotting 2 is 2 with the ratio of the aperture d of air film hole 1, and the groove depth s of transversal slotting 2 is 0.25 with the ratio of the aperture d of air film hole 1.
Embodiment 3
Identical with embodiment 1 of the position of each several part and annexation in the described structure of the present embodiment.The present embodiment protrusions 3 is two prism-type circular arcs (see Fig. 9), two circular arcs are to cross air film hole and export 11 centers and straight line perpendicular to wall 4 is arranged for axisymmetric, protruding 3 directions of meeting to air film hole 1 are front portion, front portion is suction port 33, opposite direction is air outlet 34, the side molded line of described protruding 3 air film holes is dorsad back pressure molded line 32, the side molded line of meeting to air film hole 1 is molded line 31 windward, back pressure molded line 32 is the camber line to wall downstream direction projection, molded line 31 is straight line windward, the spacing of molded line 31 and back pressure molded line 32 is the value of change windward, namely the two ends of prism-type circular arc all linearly.
In the present embodiment, air film hole 1 is cylindrical, air film hole 1 angle β is with respect to the horizontal plane 60 °, the ratio of the lateral length e of described wall 4 and the aperture d of air film hole is 10, and the length w of suction port is 3 times of the aperture d of air film hole 1, and the length of suction port 33 is 3 times of the length of air outlet 34; The ratio L/d that the suction port of projection 3 exports the distance L at 11 centers and the aperture d of air film hole 1 apart from air film hole is 20; The X of protruding 3 is 1.0 to the ratio of length w1 and Y-direction length w2, and the ratio of the projection height H of 3 and the aperture d of air film hole 1 is 0.25.The groove width c of transversal slotting 2 is 6 with the ratio of the aperture d of air film hole 1, and the groove depth s of transversal slotting 2 is 1 with the ratio of the aperture d of air film hole 1.
Embodiment 4
Identical with embodiment 1 of the position of each several part and annexation in the described structure of the present embodiment.The present embodiment protrusions 3 is the arc (see Figure 10) of two topological resemblance, two arcs are to cross air film hole and export 11 centers and straight line perpendicular to wall 4 is arranged for axisymmetric, protruding 3 directions of meeting to air film hole 1 are front portion, front portion is suction port 33, opposite direction is air outlet 34, the side molded line of described protruding 3 air film holes is dorsad back pressure molded line 32, the side molded line of meeting to air film hole 1 is molded line 31 windward, back pressure molded line 32 and windward molded line 31 are the camber line to wall downstream direction projection, the spacing of molded line 31 and back pressure molded line 32 is the value of change windward, become large gradually along the negative half axle direction spacing of Y-axis, namely one end of the arc of topological resemblance linearly, the other end is an end face.
In the present embodiment, air film hole 1 is cone shape hole, air film hole 1 angle β is with respect to the horizontal plane 45 °, the ratio of the lateral length e of described wall 4 and the aperture d of air film hole is 5, and the length w of suction port is 5 times of the aperture d of air film hole 1, and the length of suction port is 4 times of the length of air outlet; The ratio L/d that the suction port of projection 3 exports the distance L at 11 centers and the aperture d of air film hole 1 apart from air film hole is 30; The X of protruding 3 is 2.0 to the ratio of length w1 and Y-direction length w2, and the ratio of the projection height H of 3 and the aperture d of air film hole 1 is 3.The groove width c of transversal slotting 2 is 6 with the ratio of the aperture d of air film hole 1, and the groove depth s of transversal slotting 2 is 1 with the ratio of the aperture d of air film hole 1.
The present invention is when topological resemblance, and protruding 3 shapes can have multiple change, and the air film that different distortion obtains laterally is distinguished to area coverage and gas film cooling efficiency all to some extent with exhibition, but is all better than the situation without protruding 3 generally.In concrete enforcement, the multiple geometric parameter of protruding 3 and transversal slotting 2 can be changed according to demand, to meet actual industrial needs.
The present invention does not address part and is applicable to prior art.
Claims (9)
1. one kind is improved the structure of fluting air film hole downstream wall gas film cooling efficiency, comprise air film hole, transversal slotting and wall, transversal slotting is opened in wall upstream region, and air film hole is positioned on transversal slotting, it is characterized in that the downstream area of described wall is provided with projection; Described projection is to cross air film hole export center and straight line perpendicular to wall is arranged for axisymmetric, the direction that projection is met to air film hole is suction port, opposite direction is air outlet, the described side molded line thrown one's back out to air film hole is back pressure molded line, the side molded line of meeting to air film hole is molded line windward, and described back pressure molded line is the molded line protruded to wall downstream direction; The length of described suction port is 2-5 times of the aperture of air film hole, and the length of suction port is 1.5-4 times of the length of air outlet; The protruding distance of suction port distance air film hole export center and the ratio in the aperture of air film hole are 10-30; The ratio in the height of described projection and the aperture of air film hole is 0.25-3.
2. the structure improving fluting air film hole downstream wall gas film cooling efficiency according to claim 1, is characterized in that the X of described projection is 1.0-4.0 to the ratio of length and Y-direction length.
3. the structure improving fluting air film hole downstream wall gas film cooling efficiency according to claim 1, is characterized in that described projection is two arcs.
4. the structure improving fluting air film hole downstream wall gas film cooling efficiency according to claim 1, described in it is characterized in that, molded line is straight line or the camber line to wall downstream direction projection windward.
5. the structure improving fluting air film hole downstream wall gas film cooling efficiency according to claim 4, is characterized in that described projection is half bracket type or prism-type.
6. the structure improving fluting air film hole downstream wall gas film cooling efficiency according to claim 1, described in it is characterized in that, the spacing of molded line and back pressure molded line is adjustable windward.
7., according to the structure of claim 1-6 arbitrary described raising fluting air film hole downstream wall gas film cooling efficiency, it is characterized in that the groove width of described transversal slotting and the ratio in air film aperture are 2-6, the groove depth of transversal slotting and the ratio in air film aperture are 0.2-1.
8. the structure improving fluting air film hole downstream wall gas film cooling efficiency according to claim 7, is characterized in that described air film hole is cylindrical, cone shape hole, rectangular opening, trapezoidal hole, dust-pan shaped hole or Console hole.
9. the structure improving fluting air film hole downstream wall gas film cooling efficiency according to claim 8, it is characterized in that described air film hole angle is with respect to the horizontal plane 15 °-60 °, the ratio in the lateral length of described wall and the aperture of air film hole is 3-10.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105240055A (en) * | 2015-10-27 | 2016-01-13 | 河北工业大学 | Cover structure for improving cooling efficiency of horizontal gas film on downstream of open slotted hole |
| CN105401983A (en) * | 2015-12-24 | 2016-03-16 | 河北工业大学 | Upstream structure for improving outer cooling effect of component |
| CN105822355A (en) * | 2016-04-12 | 2016-08-03 | 河北工业大学 | Novel air film cooling slotting structure |
| CN108643975A (en) * | 2018-03-22 | 2018-10-12 | 南京航空航天大学 | A kind of structure improving gas film cooling efficiency using memorial alloy |
| CN108729953A (en) * | 2018-04-24 | 2018-11-02 | 哈尔滨工程大学 | A kind of turbine in end wall air film hole upstream arrangement crescent dune boss structure |
| CN113006879A (en) * | 2021-03-19 | 2021-06-22 | 西北工业大学 | Aeroengine turbine film cooling hole with vortex generator |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5779438A (en) * | 1996-03-30 | 1998-07-14 | Abb Research Ltd. | Arrangement for and method of cooling a wall surrounded on one side by hot gas |
| US20050123401A1 (en) * | 2003-06-30 | 2005-06-09 | General Electric Company | Component and turbine assembly with film cooling |
| CN101042056A (en) * | 2007-04-30 | 2007-09-26 | 西安交通大学 | Grooving gaseous film cooling hole |
| US20080138209A1 (en) * | 2006-12-11 | 2008-06-12 | United Technologies Corporation | High aspect ratio blade main core modifications for peripheral serpentine microcircuits |
| CN102140964A (en) * | 2010-02-03 | 2011-08-03 | 中国科学院工程热物理研究所 | Structure for improving cooling efficiency of gas film of discrete hole |
| CN103967531A (en) * | 2013-02-01 | 2014-08-06 | 西门子公司 | Film-cooled turbine blade for fluid machinery |
| CN204457880U (en) * | 2015-02-10 | 2015-07-08 | 河北工业大学 | A kind of structure improving fluting air film hole downstream wall gas film cooling efficiency |
-
2015
- 2015-02-10 CN CN201510069092.3A patent/CN104594956B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5779438A (en) * | 1996-03-30 | 1998-07-14 | Abb Research Ltd. | Arrangement for and method of cooling a wall surrounded on one side by hot gas |
| US20050123401A1 (en) * | 2003-06-30 | 2005-06-09 | General Electric Company | Component and turbine assembly with film cooling |
| US20080138209A1 (en) * | 2006-12-11 | 2008-06-12 | United Technologies Corporation | High aspect ratio blade main core modifications for peripheral serpentine microcircuits |
| CN101042056A (en) * | 2007-04-30 | 2007-09-26 | 西安交通大学 | Grooving gaseous film cooling hole |
| CN102140964A (en) * | 2010-02-03 | 2011-08-03 | 中国科学院工程热物理研究所 | Structure for improving cooling efficiency of gas film of discrete hole |
| CN103967531A (en) * | 2013-02-01 | 2014-08-06 | 西门子公司 | Film-cooled turbine blade for fluid machinery |
| CN204457880U (en) * | 2015-02-10 | 2015-07-08 | 河北工业大学 | A kind of structure improving fluting air film hole downstream wall gas film cooling efficiency |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105240055A (en) * | 2015-10-27 | 2016-01-13 | 河北工业大学 | Cover structure for improving cooling efficiency of horizontal gas film on downstream of open slotted hole |
| CN105401983A (en) * | 2015-12-24 | 2016-03-16 | 河北工业大学 | Upstream structure for improving outer cooling effect of component |
| CN105822355A (en) * | 2016-04-12 | 2016-08-03 | 河北工业大学 | Novel air film cooling slotting structure |
| CN105822355B (en) * | 2016-04-12 | 2017-08-29 | 河北工业大学 | A kind of New Gas Film cools down notching construction |
| CN108643975A (en) * | 2018-03-22 | 2018-10-12 | 南京航空航天大学 | A kind of structure improving gas film cooling efficiency using memorial alloy |
| CN108729953A (en) * | 2018-04-24 | 2018-11-02 | 哈尔滨工程大学 | A kind of turbine in end wall air film hole upstream arrangement crescent dune boss structure |
| CN113006879A (en) * | 2021-03-19 | 2021-06-22 | 西北工业大学 | Aeroengine turbine film cooling hole with vortex generator |
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