考虑滑流影响的埋入式进气道气动特性分析与流动控制研究

研究滑流对埋入式进气道性能的影响机理对于发动机的稳定性具有重要意义。针对某型涡桨发动机 滑油散热器进排气道系统,基于 CFD技术建立系统的螺旋桨滑流与滑油散热器内流一体化数值模拟方法,进 行考虑滑流影响的滑油散热系统埋入式进气道气动设计仿真分析;针对埋入式进气道由于吸入边界层低能气 流导致通过散热器流量低的问题,设计4组涡流发生器进行主动流动控制。结果表明:滑流使得进气道中的气 流偏离,难以形成稳定漩涡,容易发生流动分离;而合理设计的涡流发生器可以有效改善埋入式进气道内流场 特性,并使通过散热器的流量提高12%。

Submerged inlet design by considering the influence propeller slipstream flow

To investigate the mechanism of the propeller slipstream influence on the aerodynamic performance of the submerged inlet, a systematical numerical method is developed to simulating the slipstream and inner flow of oil radiator for a certain turboprop aircraft. The aerodynamic characteristic of the submerged inlet of the oil radiator within the propeller slipstream is deeply analyzed. Moreover, several vortex generators are designed to control the flow around inlet of the oil radiator to increase the flow rate affected by the inhaled low energy flow of the boundary layer in the inlet. The results indicate that, the calculating data agree well with those of test by using the numerical method, and the reasonable vortex generator can effectively improve the flow of the submerged inlet by increasing the flow rate with 12%.