内埋武器舱关键气动及声学问题研究

以风洞试验为手段，在高速风洞中对内埋武器舱关键气动问题进行了深入研究。利用静态压力测量、脉动压力测量、网格测力等测试手段，获取了典型弹舱流场静压分布特性、气动声学特性以及武器分离特性。研究结果表明：舱内静压分布变化明显，可以此定义弹舱流场类型；开式弹舱流场气动声学环境恶劣，总声压级强度可达170dB 以上，且频谱曲线上存在多个明显的能量尖峰；武器从舱内分离过程中可能产生较大的抬头力矩，影响机/弹安全分离；在弹舱前缘施以流动控制能降低舱内静压梯度、抑制气动噪声，且有利于改善武器分离特性。

Investigation on key aerodynamic and aeroacoustic problems of internal weapons bay

An experimental investigation was conducted in a high speed wind tunnel to ex-plore key aerodynamic and aeroacoustic problems of internal weapons bay.Steady pressure meas-urement,fluctuation pressure measurement and grid measurement were applied to obtain detailed characteristics of static pressure,fluctuating pressure and internal weapon aerodynamic in this experiment.Results indicated that flow types of internal weapons bay can be defined by the static pressure distributions on its floor.Aeroacoustic environment for open cavity flow is much worse than closed cavity flow,and the maximum sound pressure level can reach up to more than 170dB. Several tones of different modes can be found in the internal weapons bay sound pressure spectra. Internal weapon may occur large positive pitching moment during separating from the bay,and positive pitching moment is harmful to safe separation between fighter plane and weapons.Re-sults also indicated that mass-injection at the fore-edge of internal weapons bay can reduce static pressure gradient,suppress the intensity of noise and improve internal weapon’s aerodynamic separation characteristics.