Casing processing device for axial flow air compressor based on synthetic jet

Abstract

The invention discloses a casing processing device for an axial flow air compressor based on synthetic jet. The casing processing device is characterized in that a T-shaped groove is formed in a wallsurface of a casing for assembling a synthetic jet generator; the synthetic jet generator is located on an upstream of the front edge of a rotor blade; a flow field is subjected to periodical excitation by the synthetic jet generator, so that energy is injected to the flow field; low-energy fluids in boundary layers around a jet hole can be absorbed through a pumping process of the periodical excitation; kinetic energy of fluids around the jet hole can be improved through a jet process; a vortex structure formed by the periodical excitation spreads to the downstream along with a main flow, sothat mass and momentum exchange between the main flow and low-energy fluids in a separation zone is intensified; the energy of the low-energy zone fluids is increased, and the separation zone is weakened. At a certain synthetic jet frequency, disturbance applied to the flow field by the jet generator is coupled with unsteady disturbance of a blade tip leaking flow, so that unsteadiness of the blade tip leaking flow is weakened. The flowing environment of the rotor blade tip of the air compressor is improved; loss is reduced; and the stable working range of the air compressor is widened.

Description

technical field [0001] The invention relates to the technical field of turbomachinery, in particular to a casing treatment device for an axial flow compressor based on a synthetic jet. Background technique [0002] Synthetic jet is a jet method that combines suction and jet periodically. Based on the theory of vortex motion, synthetic jet technology is increasingly used as a means of flow control. At present, great progress has been made in the research and application of synthetic jets in improving airfoil lift, delaying wing stall, enhancing fuel mixing in aero-engine combustors, and controlling separation of turbine cascades. However, in compressors, synthetic jets Jet technology has not found practical application. The casing treatment is an important means to improve the stability of the compressor. Among them, air injection and suction are the two main casing treatment methods. Although the traditional air injection and suction have achieved certain results in the ex...

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Problems solved by technology

At present, great progress has been made in the research and application of synthetic jets in improving airfoil lift, delaying wing stall, enhancing fuel mixing in aero-engine combustors, and controlling separation of turbine cascades. However, in compressors, synthetic jets Jet technology has not been used in practice

The casing treatment is an important means to improve the stability of the compressor. Among them, air injection and suction are the two main casing treatment methods. Although the traditional air injection and suction have achieved certain results in the expansion and stability of the compressor, but Both of these two methods must connect the compressor with the outside world, which increases the complexity of the equipment and greatly limits its application range, so that it eliminates the feasibility of its application on aero-engines

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