CN208803876U - A kind of leading edge end wall - Google Patents
A kind of leading edge end wall Download PDFInfo
- Publication number
- CN208803876U CN208803876U CN201821181024.1U CN201821181024U CN208803876U CN 208803876 U CN208803876 U CN 208803876U CN 201821181024 U CN201821181024 U CN 201821181024U CN 208803876 U CN208803876 U CN 208803876U
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- CN
- China
- Prior art keywords
- leading edge
- wall body
- wall
- end wall
- leaf grating
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Abstract
The utility model provides a kind of leading edge end wall, is set in leaf grating leading edge, inhibits the generation of Secondary Flow in the up-front stagnation region of leaf grating for having the function that edge wall angle comprising: keeping the continuous wall body of surface curvature.The height of wall body gradually rises along the rear end of leading edge locus to the wall body of wall body, and height is up to 9mm.The length of wall body is 37mm.The inclination angle of wall body is 14.7 °.A kind of leading edge endwall structure of the utility model is simple, and it is convenient to construct, and can effectively inhibit the horse shoe vortex of Secondary Flow and the generation in strong angle whirlpool, and can be effectively improved the fluid flow effect of leaf grating leading edge locus.
Description
Technical field
The utility model relates to a kind of end walls, and in particular to a kind of leading edge end wall.
Background technique
It is inconsistent with main flow direction since the effect of circumferential direction, radial-axial barometric gradient can be generated in turbine cascade end
Secondary Flow.The presence of Secondary Flow makes proximal end wall position generate biggish secondary flow loss, accounts for the 30%-50% of total losses.Meanwhile
The presence of Secondary Flow can also make leaf grating outlet flow angle occur to bring the bigger angle of attack to damage for next stage with deficient deflection partially
It loses, turbine flowing deteriorates.Secondary Flow is made of the vortex structure of a series of complex, wherein generated in the leading edge stagnation region of leaf grating
Horse shoe vortex is particularly important.Leading edge stagnation region is the generation position of entire Secondary Flow, and the improvement of the position flow regime can also make
Obtaining the secondary flow structure of runner is inhibited.In order to inhibit the generation of leading edge locus stagnation region Secondary Flow, edge wall angle is designed to obtain
Extensive use can reduce Turbulent Kinetic and horse shoe vortex by artificially constructing between leaf grating leading edge and wall angle wall corner structure
Intensity, but since the curvature between edge wall angle and end wall is discontinuous but also leading edge stagnation fluid is along the angular downstream of edge wall
Development process in link position occur flowing angle acute variation, and link position generate the biggish angle whirlpool of intensity.
The presence in two angles whirlpool will bring the deterioration of angular region local location flowing and heat transfer, can make the heat transfer enhancing of wall angle two sides, and make
The gaseous film control for obtaining the position is affected.It is therefore desirable to a kind of leading edge end wall for being able to solve the above problem.
Utility model content
The utility model is to carry out to solve the above-mentioned problems, and it is an object of the present invention to provide a kind of leading edge end wall.
The utility model provides a kind of leading edge end wall, is set in leaf grating leading edge, for having the function that edge wall angle
To inhibit the generation of Secondary Flow in the up-front stagnation region of leaf grating comprising: keeping the continuous wall body of surface curvature.
In a kind of leading edge end wall provided by the utility model, it can also have the following features: wherein, the height of wall body
Rear end along leading edge locus to the wall body of wall body gradually rises, and height is up to 9mm.
In a kind of leading edge end wall provided by the utility model, it can also have the following features: wherein, the length of wall body
For 37mm.
In a kind of leading edge end wall provided by the utility model, it can also have the following features: wherein, the inclination angle of wall body
It is 14.7 °.
The action and effect of utility model
A kind of leading edge end wall according to involved in the utility model, because leading edge end wall is by being designed as the sample at edge wall angle
Formula plays the role of edge wall angle, thus it is possible to inhibit the generation of Secondary Flow in the leading edge stagnation region of leaf grating, reduces Secondary Flow
The intensity of middle horse shoe vortex；Because of the continual curvature on wall body surface, thus it is possible to inhibit the generation in strong angle whirlpool, reduce because of strong angle
Caused by whirlpool the drawbacks of heat transfer enhancing；Because the leading edge end wall for being designed as edge wall angle pattern can be effectively by leaf grating leading edge position
The low energy fluid in the interbed of side is set to dredge to leading edge two sides so that the reflux of leading edge locus disappears, thus it is possible to effectively change
The flow effect of kind leaf grating leading edge locus.Therefore a kind of leading edge end wall of the utility model can effectively inhibit Secondary Flow and strong
The generation in angle whirlpool, and effectively improve the flow effect of leaf grating leading edge locus.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of leading edge end wall in the embodiments of the present invention；
Fig. 2 is a kind of vertical view contour map of leading edge end wall in the embodiments of the present invention；
Fig. 3 is a kind of A-A sectional view of leading edge end wall in the embodiments of the present invention；
Fig. 4 is a kind of B-B sectional view of leading edge end wall in the embodiments of the present invention；
Fig. 5 is the up-front streamline distribution figure of leaf grating original in the embodiments of the present invention；
End wall control point distribution map in Fig. 6 the embodiments of the present invention when a kind of moulding construction of leading edge end wall；
Fig. 7 is the up-front Eddy Distribution schematic diagram of leaf grating original in the embodiments of the present invention；
Fig. 8 is the leaf grating leading edge vortex distribution schematic diagram that edge wall angle is used in the embodiments of the present invention；
Fig. 9 is the leaf grating leading edge vortex distribution schematic diagram that leading edge end wall is used in the embodiments of the present invention；
Figure 10 is the up-front streamline distribution figure of leaf grating that leading edge end wall is used in the embodiments of the present invention；
Specific embodiment
In order to be easy to understand technological means of the utility model and effect, with reference to embodiments and attached drawing
The utility model is specifically addressed.
Fig. 1 is a kind of structural schematic diagram of leading edge end wall in the embodiments of the present invention.
As shown in Figure 1, a kind of leading edge end wall 100 in the embodiments of the present invention, is set in leaf grating leading edge 200, use
In the generation for having the function that Secondary Flow in stagnation region of the edge wall angle to inhibit leaf grating leading edge 200, comprising: keep surface curvature
Continuous wall body.
Wall body is directly designed to the pattern at edge wall angle or keep with edge wall angle the connection of continual curvature.
Fig. 2 is a kind of vertical view contour map of leading edge end wall in the embodiments of the present invention, and Fig. 3 is the utility model
A kind of A-A sectional view of leading edge end wall in embodiment, Fig. 4 are that a kind of B-B of leading edge end wall is cutd open in the embodiments of the present invention
Face figure.
As shown in Fig. 2, Fig. 3 and Fig. 4, the height of wall body gradually rises along the rear end of leading edge locus to the wall body of wall body,
Height is up to 9mm.
The length of wall body is 37mm.
The inclination angle of wall body is 14.7 °.
A kind of construction process of the leading edge end wall of the present embodiment:
Fig. 5 is the up-front streamline distribution figure of leaf grating original in the embodiments of the present invention, the reality of Fig. 6 the utility model
Apply the end wall control point distribution map when moulding construction of a kind of leading edge end wall in example.
The position for determining the leading edge stagnation point of saddle point and leaf grating according to the streamline distribution figure in Fig. 5 first, further according to saddle
Point establishes a dot matrix with 5 × 6 control point with the position of leading edge stagnation point, as shown in fig. 6, leading edge stagnation point and preceding
The trisection point of close saddle point between edge stagnation point and the line of saddle point is the controllable point for being able to carry out height lifting, this two
One is equipped between a controllable point with control point, the rising height with control point is that the rising height of controllable point is average
Value, remaining point is the not changed fixed control point of height, using 30 points in dot matrix as benchmark, and by two
The rising height of controllable point carries out end wall moulding by Kriging agent model on nurbs surface as Optimal Parameters
A kind of leading edge end wall 100 of the present embodiment is obtained after optimization.
The action and effect of embodiment
Fig. 7 is the up-front Eddy Distribution schematic diagram of leaf grating original in the embodiments of the present invention, and Fig. 8 is that this is practical new
The leaf grating leading edge vortex distribution schematic diagram at edge wall angle is used in the embodiment of type, Fig. 9 is made in the embodiments of the present invention
With the leaf grating leading edge vortex distribution schematic diagram of leading edge end wall.
Two horse shoe vortexes are generated from Fig. 7, Fig. 8 and Fig. 9 it is found that rolling in Fig. 7 in leaf grating edge fluid, in Fig. 8
It is substantially reduced using the intensity of two horse shoe vortexes of leaf grating edge at edge wall angle, but produces two at edge wall angle
Strong angle whirlpool, and be substantially reduced in Fig. 9 using the intensity of two horse shoe vortexes of the leaf grating edge of leading edge end wall, and inhibit
The generation in the angle edge wall Jiao Chu whirlpool.
Figure 10 is the up-front streamline distribution figure of leaf grating that leading edge end wall is used in the embodiments of the present invention.
From Fig. 5 and Figure 10 it is found that producing separation by the fluid of leaf grating edge in Fig. 5, and flowed back
Phenomenon, and fluid along leading edge end wall flows to the up-front two sides of leaf grating in Figure 10, fluid is without segregation phenomenon, and backflow phenomenon disappears
It loses.
In conclusion a kind of leading edge endwall structure of the present embodiment is simple, it is convenient to construct, and can effectively inhibit Secondary Flow
Horse shoe vortex and strong angle whirlpool generation, and the fluid flow effect of leaf grating leading edge locus can be effectively improved.
Above embodiment is the preferred case of the utility model, is not intended to limit the protection scope of the utility model.
Claims (4)
1. a kind of leading edge end wall, is set in leaf grating leading edge, inhibit leaf grating up-front stagnant for having the function that edge wall angle
Only in area Secondary Flow generation comprising: keep the continuous wall body of surface curvature.
2. a kind of leading edge end wall according to claim 1, it is characterised in that:
Wherein, the height of the wall body gradually rises along the rear end of leading edge locus to the wall body of the wall body, the height
Up to 9mm.
3. a kind of leading edge end wall according to claim 1, it is characterised in that:
Wherein, the length of the wall body is 37mm.
4. a kind of leading edge end wall according to claim 1, it is characterised in that:
Wherein, the inclination angle of the wall body is 14.7 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821181024.1U CN208803876U (en) | 2018-07-25 | 2018-07-25 | A kind of leading edge end wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821181024.1U CN208803876U (en) | 2018-07-25 | 2018-07-25 | A kind of leading edge end wall |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208803876U true CN208803876U (en) | 2019-04-30 |
Family
ID=66228674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821181024.1U Expired - Fee Related CN208803876U (en) | 2018-07-25 | 2018-07-25 | A kind of leading edge end wall |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208803876U (en) |
-
2018
- 2018-07-25 CN CN201821181024.1U patent/CN208803876U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190430 Termination date: 20200725 |