Self-circulation treatment casing for simultaneously improving stator corner region flowing

Abstract

The invention relates to multistage axial flow air compressor treatment casings, and discloses a self-circulation treatment casing for simultaneously improving stator corner region flowing. The self-circulation treatment casing comprises a target rotor blade, a downstream stator blade, a casing body and an air guide pipe structure located in the casing body. A flow guide cavity structure penetrating the whole circumferential direction is arranged at the position, on the front edge of a target rotor blade tip, in the casing body. Flow guide cavity outlet front guide vanes used for adjusting the jet flow direction are circumferentially and evenly arranged on the front edge of a flow guide cavity outlet, and the outlet directions of the guide vanes are consistent with the pre-rotating direction of the target rotor blade tip. According to the characteristic of stage-by-stage pressurization of a multistage air compressor, self-adaptive suction and jet flow are formed under the action of differential pressure of a downstream stator blade combined suction groove and the flow guide cavity outlet of the target rotor blade tip; separated flowing of a stator three-dimensional corner region of the air compressor is effectively restrained, and meanwhile moving blade rotating stall is prevented from happening too early through circumferentially-even jet flow with the pre-rotating direction consistent with that of the rotor blade tip; the rotor blade rotating stability and margin are increased; and the stable work condition range of the air compressor is widened.

Description

technical field [0001] The invention relates to a self-circulation processing casing of a multistage axial flow compressor, in particular to a self-circulation processing casing which simultaneously improves the flow in the corner area of ​​a stator. Background technique [0002] The compressor is the core component of the aviation gas turbine engine. It is composed of multi-stage rotors and stators arranged in a staggered order. Its function is to increase the gas pressure rise; in the flow inside the compressor, due to the small flow space, the reverse pressure of the fluid The gradient effect is strong, and it has a complex vortex structure; the corner separation structure located at the stator end zone and the leakage flow structure located at the rotor tip are the main secondary flow structures inside the compressor, and are the main causes of flow loss and blockage inside the compressor. The source has a vital impact on the performance of the compressor's pressure rati...

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Problems solved by technology

[0002] The compressor is the core component of the aviation gas turbine engine. It is composed of multi-stage rotors and stators arranged in a staggered order. Its function is to increase the gas pressure rise; in the flow inside the compressor, due to the small flow space, the reverse pressure of the fluid The gradient effect is strong, and it has a complex vortex structure; the corner separation structure located at the stator end zone and the leakage flow structure located at the rotor tip are the main secondary flow structures inside the compressor, and are the main causes of flow loss and blockage inside the compressor. The source has a vital impact on the performance of the compressor's pressure ratio, efficiency, and margin. In severe cases, it will cause the stall and surge of the compressor, which will bring disastrous consequences; after decades of research, many scientific research works Researchers have had a deep understanding of the compressor stator corner flow and rotor blade tip flow, but due to the limitations of space and the complexity of the flow, it has not been well realized based on the existing research results. Effective control of the flow in the compressor; in particular, making full use of the characteristics of the step-by-step pressurization of the flow in the compressor, through a certain self-circulation adjustment mechanism, while using and improving the flow structure that is not conducive to performance, to achieve the purpose of improving the performance of the compressor

[0003] For the compressor stator, the flow congestion caused by three-dimensional corner separation / stall makes the performance of the compressor drop sharply; the development of modern aero-engines puts forward higher requirements on the performance of the compressor, especially the increase of single-stage load and more Wide effective working range is required; however, with the increase of compressor load, the degree of three-dimensional angular separation increases sharply, and the range of effective working angle of attack decreases sharply; at present, the flow control technology for compressor stator angular separation and stall , from whether additional energy is introduced, it can be mainly divided into two categories: active control technology and passive control technology: active control technology mainly includes plasma excitation, boundary layer suction technology, synthetic jet, etc.; passive control technology mainly includes vortex generator , wing knife, end wall shape, etc.; the boundary layer suction technology in the active control technology has the characteristics of wide adaptability and obvious benefits, but it needs to introduce additional energy, which is not easy to realize in engineering; the existing traditional passive control technology does not have Adaptive, the range of effective working conditions is often limited, and it cannot solve the problem of corner separation of the next generation of high-load compressors in engineering

[0004] For the compressor rotor, the tip leakage flow has an important influence on the stable working state of the compressor. The rotation stall problem caused by the overflow of the rotor leading edge is the key to restricting the stable operation of the engine; The introduction of jet flow can effectively improve the leakage flow of the rotor tip, increase the stall margin of the rotor, and achieve a better stability expansion effect; the traditional air blowing technology of the rotor tip is mostly active control, which requires additional energy, which is not conducive to engineering Realization; there is also a scheme of self-flowing casing, but its jet outlets are distributed in an intermittent array along the circumferential direction, which cannot form a uniform jet flow in the circumferential direction, which interferes with the stability of the flow

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