带多孔板的APU进气系统气动性能实验

Experiment on aerodynamic performance of APU air inlet system with perforated plate

利用实验方法对一类带多孔板的辅助动力装置(APU)进气系统气动性能进行了研究.实验结果表明:两出口的总压恢复系数和总压畸变指数均随流量的增加不断降低.总压恢复系数在定总流量时略微下降,在定配比时几乎线性下降.总压畸变在周向上主要受多孔板无孔区影响,径向上主要受流道曲率影响.随开孔率增加,总压恢复系数不断增加.动力端不同开孔率下,总压畸变以径向畸变为主,负载端在小开孔率时以周向畸变为主,大开孔率时径向畸变成为主要因素.

The aerodynamic performance of a kind of air inlet system with perforated plate used in auxiliary power units （APU） was investigated experimentally. The experimen tal results show that with the increase of mass flow rate, the outlet total pressure recovery coefficient and total pressure distortion coefficient decrease. The total pressure recovery co efficient decreases slightly in the fixed total mass flow rate case, but decreases linearly in the fixed proportion case. The total pressure distortion is mainly influenced by the imperforate area of the whole perforated plate in the circumferential direction and the flow passage curva ture in the radial direction. With the increase of orifice ratio, the outlet total pressure recov ery coefficient increases accordingly. The total pressure distortion of power section is mainly influenced radially in different orifice ratios; the distortion of load section is mainly influ enced circumferentially in small orifice ratio and radially in large orifice ratio.