关键词: 航空发动机, 高负荷压气机, 自适应康达喷气, 流动控制, 总压损失

Abstract:

Future development of aeroengines requires continuous increase in the compressor stage load， which will result in strong secondary flows such as corner separation and boundary layer flow separation in the compressor. In this paper， a new Adaptive Coanda Jet Control （ACJC） technology is proposed to intelligently and efficiently restrain the flow separation in the compressor and improve the diffusion capacity of the compressor， and the stable and efficient operation range of the highly loaded compressor is dramatically broadened. To construct the ACJC system and verify its control effect in a highly loaded compressor， we first employ a highly loaded compressor stator cascade constructed based on the Zierke & Deutsch airfoil to investigate the ACJC system， with the diffusion factor of 0.66 at the design point. Then， the variance analysis method， principal component analysis method and neural network algorithm are adopted to establish the incidence angle prediction model and the optimal injection mass flow rate prediction model of the Coanda jet flap. Finally， an experimental platform based on the ACJC system is built to verify the effectiveness and accuracy of flow separation control for the highly loaded cascade. The experimental results indicate that the ACJC system can accurately predict the incidence angle and adjust the Coanda jet mass flow rate in real time at different incidence angles and different incoming Mach numbers. In addition， compared to the cascade without the ACJC system at the incidence angel of 5°， the total pressure loss coefficient is reduced by 11.5%， 9.8% and 8.0% for incoming Mach numbers of 0.4， 0.5 and 0.6， respectively.

Key words: aeroengine, highly loaded compressor, adaptive Coanda jet, flow control, total pressure loss