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

Research on Aerodynamic Performance Simulation and Flow Control on the Submerged Inlet by Considering the Influence Propeller Slipstream Flow

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%。

It is of great significance to investigate the mechanism of the propeller slipstream influence on the aerodynamic performance of the submerged inlet to keep the stability of the engine.A systematical numerical computational fluid dynamics(CFD)method is established to simulate the slipstream and inner flow of oil radiator for a certain turboprop aircraft.The simulation analysis is performed for the aerodynamic characteristic of the submerged inlet of the oil radiator within the propeller slipstream.Moreover,four 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 show that:within the influence of the propeller slipstream,the flow in the submerged inlet is deviated and can hardly generate stable vortex.However,the reasonable vortex generator can effectively improve the flow of the submerged inlet by increasing the flow rate with 12%.