CN108397237B - Composite winglet - Google Patents
Composite winglet Download PDFInfo
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- CN108397237B CN108397237B CN201810052579.4A CN201810052579A CN108397237B CN 108397237 B CN108397237 B CN 108397237B CN 201810052579 A CN201810052579 A CN 201810052579A CN 108397237 B CN108397237 B CN 108397237B
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- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 230000000694 effects Effects 0.000 claims description 13
- 230000000903 blocking effect Effects 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 230000002401 inhibitory effect Effects 0.000 abstract description 10
- 238000007789 sealing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 239000008358 core component Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/305—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the pressure side of a rotor blade
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/306—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the suction side of a rotor blade
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a composite winglet, which structurally comprises a winglet arranged on the suction side of the top end of a blade, and a plurality of splitter boxes arranged on the surface of the top end of the blade; the tip surface includes both portions of the winglet and the top of the original blade. According to the invention, while the function of inhibiting clearance leakage by a conventional winglet is kept, the flow which is crossed with the flow direction of the leakage flow on the blade top is formed by the splitter box additionally arranged on the surface of the blade top, so that the leakage flow which directly crosses the blade top from the pressure surface side is reduced, and meanwhile, the leakage flow is split into a plurality of strands by the splitter boxes with different outlet angles, a plurality of leakage vortexes with lower strength are formed in the channel, and the mixing loss of the leakage flow and the low-energy flow on the suction surface side is reduced, thereby improving the performance of the impeller.
Description
Technical Field
The invention relates to a composite winglet which is mainly arranged at the top end of a rotor blade and used for inhibiting leakage flow from the pressure surface of the blade to the suction surface side of the blade in a blade top clearance area so as to improve the mechanical performance of an impeller; belongs to the technical field of impeller machinery.
Background
The impeller machine is an important mechanical device, is widely applied to the fields of aerospace navigation, energy power and the like, is a core component of equipment such as an aircraft engine, a gas turbine, a supercharger, a centrifugal pump and the like, and the performance of the impeller machine limits the overall performance of the equipment; in impeller machinery, a certain radial clearance exists between a rotor blade and a casing of the rotor blade so as to contain the radial tensile deformation of the blade caused by centrifugal load and thermal load when the impeller works, but leakage from a pressure surface side of the blade to a suction surface side is caused at the same time, so that the pressure difference between two sides of the blade is reduced, the work capacity of the impeller is reduced, and the leakage flow is mixed with low-energy flow on the suction surface side of the blade to cause obvious mixing loss, which all cause the obvious reduction of the performance of the impeller; taking an axial-flow turbine in a conventional aviation turbine engine as an example, at present, the loss caused by blade tip leakage accounts for more than 1/3 of the flow loss of a turbine stage, the clearance size is increased by 1% for each increase of the blade height, the turbine efficiency is reduced by 1.5%, and the oil consumption rate of the engine is increased by 3%, so that a proper clearance leakage flow inhibition measure is sought, the axial-flow turbine has an important significance for improving the performance of impeller machinery, and is one of research hotspots in the field of the impeller machinery at present.
Researchers provide various inhibiting measures aiming at leakage flow of a blade top gap, and the inhibiting measures are in the forms of a sealing labyrinth, a blade tip winglet, blade top treatment, a casing treatment, unsteady excitation and the like; the sealing labyrinth has a good sealing effect, but the structure is more complex, the manufacturing cost is high, and therefore the sealing labyrinth is more applied to early aero-engines; the processing case and the unsteady excitation need huge additional equipment (additional pipelines, power supplies and the like), the sealing effect is poor, and the practical applicability is not strong; the structure of the winglet and the blade top treatment is relatively simplified, and more attempts and applications are made on the aeroengine, but the leakage restraining effect of the winglet and the blade top treatment is not as effective as the labyrinth sealing effect.
The winglet is a common measure for inhibiting blade tip leakage, and the main working principle is that the driving pressure difference at two sides of a clearance area is reduced by increasing the length of a flow channel of the blade tip clearance area, and the flow resistance at the position is increased, so that the leakage flow in the clearance area is reduced, and the leakage loss is reduced; meanwhile, researchers also find that winglets arranged on the suction surface of the blade can push the leakage flow to the middle of a channel far away from the surface of the blade, so that the interaction between the leakage flow and low-energy flow on the suction surface side is reduced, the flow loss can be reduced, and the performance of the impeller is improved.
The winglet is a thin sheet structure which is similar to the blade profile of the blade but is wider, and is arranged at the top of the blade, and in the current technical scheme, the winglet is arranged on the suction surface side and the pressure surface side, and is also arranged on the suction surface side and the pressure surface side simultaneously; the length of a flow channel of a blade top clearance area is increased by the wider blade top, so that the flow resistance in the area is increased, and the pressure difference at two sides of the clearance flow channel is reduced, namely the driving force of leakage flow is reduced, so that the leakage flow and the leakage loss are reduced by the principle; the increase in winglet width is effective in reducing leakage flow, but causes additional frictional losses, so that an excessive winglet width does not contribute to the improvement in impeller performance; under the condition of smaller winglet width, the simple flow channel structure has a not very obvious effect of inhibiting leakage loss, and the current research result shows that the winglet can improve the efficiency of the impeller by an amplitude of no more than 1%; however, winglets have simple structures and lower cost, and are particularly suitable for small-sized aeroengines, gas turbines and other equipment with smaller size and power, so that a scheme of the winglets with simple and reliable structures and obvious suppression effects is developed, and the winglets are very valuable for reducing tip clearance leakage and improving the performance of impellers.
Disclosure of Invention
The invention provides a composite winglet, aiming at better inhibiting the tip clearance leakage of impeller machinery.
The technical solution of the invention is as follows: a composite winglet structurally comprises a winglet arranged on the suction side surface side of the top end of a blade, and a plurality of splitter boxes arranged on the surface of the top end of the blade; the tip surface includes both portions of the winglet and the top of the original blade.
The invention has the advantages that: according to the composite winglet provided by the invention, the function of inhibiting clearance leakage of the conventional winglet is kept, meanwhile, the flow which is crossed with the flow direction of the leakage flow of the blade top is formed by the splitter box additionally arranged on the surface of the blade top, the leakage flow which directly crosses the blade top from the pressure surface side is reduced, meanwhile, the leakage flow is split into a plurality of strands through the plurality of splitter boxes with different outlet angles, a plurality of leakage vortexes with lower strength are formed in the channel, and the mixing loss of the leakage flow and the low-energy flow at the suction surface side is reduced, so that the performance of the impeller is improved.
Drawings
FIG. 1 is a schematic view of a composite winglet configuration with a splitter box.
FIG. 2 is a schematic view of the position and direction of the grooves of the splitter box on the top surface of the blade.
Fig. 3 is a schematic diagram of the conventional leakage flow blockage by the jet flow in the diversion trench.
FIG. 4 is a schematic diagram of injection entrainment of jet flow in the splitter box to the air flow in the gap area and plugging of conventional leakage flow.
FIG. 5 is a schematic illustration of a conventional winglet scheme leakage flow compared to a winglet leakage flow with a splitter box.
Detailed Description
A composite winglet structurally comprises a winglet arranged on the suction side surface side of the top end of a blade, and a plurality of splitter boxes arranged on the surface of the top end of the blade; the tip surface includes both portions of the winglet and the top of the original blade.
The original blade refers to a rotor blade in impeller machinery.
The composite winglet with the splitter box can be used for better inhibiting the leakage of a blade top gap of the impeller machinery.
The splitter box is the recess form.
The composite winglet is arranged on the suction side of the top end of a rotor blade in the impeller machinery; the width of the composite winglet is 3% -8% of the height of the rotor blade, the height of the composite winglet is 2% -5% of the height of the rotor blade, and 3-5 splitter boxes are arranged on the top surface of the blade within the range of 15% -80% of the chord length of the rotor blade.
The trend of the splitter box and the camber line of the local blade form an included angle of 30-45 degrees; when the impeller normally works, high-pressure gas on the pressure surface side of the impeller at the inlet of the splitter box flows to the suction surface side through the splitter boxes, jet flow with a certain speed is formed in the splitter box, the flow direction of the jet flow forms a certain included angle with the flow direction of a conventional leakage flow, and equivalently, a plurality of blocking belts are formed in a main area generating the leakage flow (as shown in figure 3); at the position without the splitter groove on the surface of the blade top, high-pressure gas on the pressure surface side still passes through the blade top under the driving of pressure difference to flow to the suction surface side, but meets jet flow in the splitter groove in the midway, and the jet flow has certain blocking effect on the leakage flow, so that the leakage flow of the part is reduced, and the leakage loss caused by the reduction is reduced.
The depth of the splitter box is 50% -80% of the thickness of the composite winglet; the blade top surface splitter box is in a runner shape with a large inlet and a small outlet, so that jet flow in the splitter box forms accelerated flow under the driving of pressure difference, the jet flow is ensured to have larger kinetic energy at the outlet and can be far away from the suction surface of the blade, and the mixing loss of low-energy flow at the side of the suction surface is reduced; meanwhile, the high flow rate of the jet flow in the diversion groove is kept, a certain injection effect can be formed on other fluid in the gap area outside the diversion groove, a part of the air flow is involved in the jet flow of the diversion groove, the jet flow strength is strengthened, a better blocking effect is formed on the leakage flow without the diversion groove, and the leakage loss is reduced (as shown in figure 4).
The outlets of different splitter boxes in the plurality of splitter boxes respectively form different included angles of 0-60 degrees with the horizontal plane in the radial direction (as shown by an angle beta 1 in figure 5, namely the included angle between the outlet plane of each splitter box and the horizontal plane is different), thus, after the gas flow in each groove is accelerated, a plurality of jet flows with different directions are formed at the outlet and are respectively sprayed into different height positions of the blade channel, because the downstream leakage flow and the upstream leakage vortex are not at the same radial height, the upstream leakage vortex cannot form stronger entrainment effect on the downstream leakage flow, so that the speed of the increase is slow, and finally, a plurality of leakage vortexes with smaller flow and weaker strength are formed at different spatial positions of the blade passage (as shown in figure 5), the small leakage vortexes with weak strength disappear quickly under the strong washing of the main flow, so that the mixing loss is small, and the performance of the impeller is improved.
According to research results of conventional winglets, the leakage flow of the top clearance mainly occurs in the range of 15% -80% of the chord length of the blade, the leakage flow of the top clearance and the low-energy flow on the side of the blade are mixed with each other to form a strong leakage vortex, so that large flow loss is caused, the winglets are additionally arranged on the suction surface to push the leakage flow to the middle of the channel, and the mixing loss of the leakage flow and the low-energy flow on the side of the suction surface is reduced; meanwhile, the increase of the width of the winglet can increase the flow resistance of the gap area and effectively reduce the leakage amount, but the friction loss of the gap area can be increased at the same time to offset the gain caused by the reduction of the leakage flow; therefore, in order to ensure the inhibition effect of the winglet and reduce the additional friction loss caused by adding the winglet, the width of the winglet is set to be 3% -8% of the height of the blade, the height of the winglet is set to be 2% -5% of the height of the blade, in order to effectively inhibit the leakage flow of the blade top gap, 3-5 splitter boxes are arranged on the surface of the blade top within the range of 15% -80% of the chord length of the blade, and the splitter boxes are utilized to form several strong jet flows which are intersected with the flow direction of the leakage flow at the blade top, so that the leakage flow leaking from the pressure surface to the suction surface is blocked, and the leakage flow of the part is reduced.
In general, leakage flow of a normal blade tip flows from a pressure surface to a suction surface side across the blade tip under the driving of pressure difference on two sides of the blade, and the flow direction of the leakage flow is basically vertical to a mean camber line of the blade, in order to utilize jet flow in the splitter box to form a good blocking effect on the leakage flow leaking from the pressure surface to the suction surface side, the flow direction in the splitter box is required to be crossed with the flow direction of the normal leakage flow, so that the trend of the splitter box (namely, the central line of the splitter box) and the mean camber line of the local blade form an included angle of 30-45 degrees (as shown by an angle alpha 1 in figure 2, namely, the included angle between the local tangent line of the central line of the splitter box and the local tangent line of the mean camber line of the; when the impeller normally works, high-pressure gas on the pressure surface side of the impeller at the inlet of the splitter box flows to the suction surface side through the splitter boxes, jet flow with a certain speed is formed in the splitter box, the flow direction of the jet flow forms a certain included angle with the flow direction of a conventional leakage flow, and equivalently, a plurality of blocking belts are formed in a main area generating the leakage flow (as shown in figure 3); at the position without the splitter groove on the surface of the blade top, high-pressure gas on the pressure surface side still passes through the blade top under the driving of pressure difference to flow to the suction surface side, but meets jet flow in the splitter groove in the midway, and the jet flow has certain blocking effect on the leakage flow, so that the leakage flow of the part is reduced, and the leakage loss caused by the reduction is reduced.
The depth of the splitter box arranged on the surface of the blade top is 50% -80% of the thickness of the winglet, and is equal to or slightly larger than the height of the blade top gap (the blade top gap of a conventional impeller is about 1% -2% of the height of the blade), so that the strength of jet flow in the splitter box can be equal to or slightly larger than the strength of conventional leakage flow, and the plugging effect can be really achieved; because leakage flow is often mixed with low-energy flow on the suction surface side of the blade top after flowing into an adjacent blade channel to cause loss, research shows that the leakage flow is pushed to the middle of the channel and is far away from the surface of the blade, and the mixing loss of the leakage flow can be reduced, so that the splitter box on the blade top is designed into a flow channel shape with a large inlet and a small outlet, jet flow in the splitter box forms accelerated flow under the driving of pressure difference, the jet flow is ensured to have larger kinetic energy at the outlet and can be far away from the suction surface of the blade, and the mixing loss with the low-energy flow on the suction surface side is reduced; meanwhile, the high flow rate of the jet flow in the diversion groove is kept, a certain injection effect can be formed on other fluid in the gap area outside the diversion groove, a part of the air flow is involved in the jet flow of the diversion groove, the jet flow strength is strengthened, a better blocking effect is formed on the leakage flow without the diversion groove, and the leakage loss is reduced (as shown in figure 4); the groove depth is 50-80% of the thickness of the winglet, so that the groove depth is equal to or slightly larger than the height of a blade top clearance area, the flow in the groove has larger kinetic energy, and the obvious plugging effect on the conventional leakage flow is ensured; meanwhile, the inlet section of the splitter box is larger than the outlet section, so that airflow is sprayed out in the box in an accelerated manner, the ejection effect can be formed on the airflow in the clearance area outside the box, the flowing strength of the part of the airflow is enhanced, the part of the airflow can be pushed to the middle of the blade channel, the part of the airflow is far away from the surface of the suction surface of the blade, and the mixing loss of leakage flow and low-energy flow on the side of the suction surface of the blade top is reduced.
In a conventional winglet, the flow direction of leakage flow at the top of a blade on the suction surface side is basically parallel to the plane of the top of the blade, the track of the leakage flow entering a main flow channel is approximately parabolic, and the leakage flow along the flow direction to each suction surface side is basically at the same radial height position, so that the leakage vortex formed at the upstream continuously sucks the leakage flow at the downstream, the strength of the leakage vortex is continuously enhanced, and large mixing loss is generated with low energy flow at the suction surface side and the main flow; in the invention, outlets of the splitter boxes arranged on the top surface of the blade form different included angles of 0-60 degrees with the horizontal plane in the radial direction (as shown by an angle beta 1 in figure 5, namely the included angle between the outlet plane of the splitter box and the horizontal plane), thus, after the airflow in each diversion trench is accelerated, a plurality of jet flows with different directions are formed at the outlet and are respectively sprayed into different height positions of the blade channel, because the downstream leakage flow and the upstream leakage vortex are not at the same radial height, the upstream leakage vortex cannot form stronger entrainment effect on the downstream leakage flow, so that the speed of the increase is slow, and finally, a plurality of leakage vortexes with smaller flow and weaker strength are formed at different spatial positions of the blade passage (as shown in figure 5), the small leakage vortexes with weak strength disappear quickly under the strong flushing of the main flow, so that the mixing loss is small, and the performance of the impeller is improved; the airflow in the splitter box is accelerated to form a plurality of jet flows in different directions at the outlet, the original large blade top clearance leakage flow is split into a plurality of small flows in the space, and the mixing loss of the leakage flow, the low energy flow on the suction surface side of the blade top and the main flow area is reduced.
The invention provides a composite winglet technology for inhibiting leakage flow in a blade top clearance area of a blade and improving mechanical efficiency of an impeller, wherein a winglet is arranged on the suction surface side of the top of the blade, 3-5 splitter boxes are arranged on the surface of the top of the blade along the flow direction, high-pressure gas on the pressure surface side is introduced into the suction surface side through the splitter boxes, and meanwhile, the fluid in the clearance area is sucked and ejected at high speed along different angles at an outlet on the suction surface side, a large leakage flow is split into a plurality of small flows, and the leakage flow is far away from the suction surface side of the top of the blade, so that the mixing loss of the leakage flow and low-energy flow near the suction surface is reduced, and the efficiency of the impeller.
Claims (1)
1. A composite winglet is characterized in that the composite winglet is arranged on the suction surface side of the top end of a rotor blade in impeller machinery, and a plurality of splitter boxes are arranged on the surface of the top of the rotor blade; the tip surface includes two portions, a winglet and an original blade tip;
the shunting groove is groove-shaped;
the width of the composite winglet is 3% -8% of the height of the rotor blade, the height of the composite winglet is 2% -5% of the height of the rotor blade, and 3-5 splitter boxes are arranged on the top surface of the blade within the range of 15% -80% of the chord length of the rotor blade;
the trend of the splitter box and the camber line of the local rotor blade form an included angle of 30-45 degrees; when the impeller normally works, high-pressure gas on the pressure surface side of the impeller at the inlet of the splitter box flows to the suction surface side through the splitter box, jet flow with a certain speed is formed in the splitter box, the flow direction of the jet flow forms a certain included angle with the flow direction of conventional leakage flow, and equivalently, a plurality of blocking zones are formed in a main area generating the leakage flow; at the position without the diversion groove on the surface of the blade top, high-pressure gas on the pressure surface side still passes over the blade top under the driving of pressure difference and flows to the suction surface side, but meets jet flow in the diversion groove in the midway, and the jet flow has certain blocking effect on the leakage flow, so that the leakage flow of the part is reduced, and the leakage loss caused by the reduction is reduced;
the depth of the splitter box is 50% -80% of the thickness of the composite winglet; the splitter box is in a flow channel shape with a large inlet and a small outlet, so that jet flow in the splitter box forms accelerated flow under the driving of pressure difference, the jet flow is ensured to have larger kinetic energy at the outlet and can be far away from the suction surface of the blade, and the mixing loss of low-energy flow at the side of the suction surface is reduced; meanwhile, the high flow rate of the jet flow in the diversion groove is kept, a certain injection effect can be formed on other fluid in the gap area outside the diversion groove, a part of air flow is involved in the jet flow of the diversion groove, the jet flow strength is strengthened, a better blocking effect is formed on the leakage flow without the diversion groove, and the leakage loss is reduced;
the outlets of different splitter boxes in the plurality of splitter boxes respectively form different included angles of 0-60 degrees with the horizontal plane in the radial direction, so that airflow in each splitter box can form a plurality of jet flows in different directions at the outlets after accelerating, the jet flows are respectively sprayed into different height positions of the blade channel, and because the downstream leakage flow and the upstream leakage vortex are not at the same radial height, the upstream leakage vortex cannot form entrainment on the downstream leakage flow, so that the increase speed of the upstream leakage vortex is slow, and finally, a plurality of leakage vortices with small flow and weak strength are formed at different spatial positions of the blade channel, and the small leakage vortices with weak strength can disappear quickly under the strong flushing of the main flow, so that the mixing loss is small, and the performance of the impeller is improved.
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| CN201810052579.4A CN108397237B (en) | 2018-01-19 | 2018-01-19 | Composite winglet |
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| CN201810052579.4A CN108397237B (en) | 2018-01-19 | 2018-01-19 | Composite winglet |
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| CN108397237B true CN108397237B (en) | 2020-11-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109162956B (en) * | 2018-09-13 | 2020-11-03 | 清华大学 | T-shaped blade top for inhibiting leakage vortex of blade top gap in pump and pump with T-shaped blade top |
| CN111255730B (en) * | 2020-01-15 | 2021-03-16 | 武汉大学 | Flange-groove combined type blade tip gap leakage vortex cavitation suppressor |
| CN111536073A (en) * | 2020-05-25 | 2020-08-14 | 浙江理工大学 | Centrifugal pump semi-open impeller with gap channel arranged on blade top |
| CN112832878B (en) * | 2020-12-31 | 2022-10-25 | 南昌航空大学 | Unsteady casing processing structure for turbine leakage flow control |
| CN114876693B (en) * | 2022-06-13 | 2024-03-22 | 西安理工大学 | Through-flow turbine device with curved groove |
| CN115977999A (en) * | 2023-01-12 | 2023-04-18 | 山东科技大学 | Subsonic compressor, rotor blade and flow stability expansion control method |
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| US9260972B2 (en) * | 2012-07-03 | 2016-02-16 | United Technologies Corporation | Tip leakage flow directionality control |
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