Effects of Geometric Parameters on Performance of Rectangular Submerged Inlet for Aircraft

To improve the comfortability and safety of aircraft,the demand of rectangular submerged inlets(RSIs)with low resistance is proposed to increase the inlet flow rate of ram air. A theoretical model is built to numerically analyze the effects of geometric parameters on the inlet mass flow rate of RSIs. The geometric parameters in question here encompass the aspect ratio of 2—4,the ramp angle of 6°—7°,the characteristic parameter of the throat of 0.20 —0.30,the ramp length of 939—1 337 mm,and the cone angle of 0° —3°. Simulation results demonstrate that the mass flow rate(MFR)is positively correlated with the aspect ratio,ramp angle,ramp length,and cone angle,and negatively correlated with characteristic parameter of the throat. Within the range of the geometric parameters considered,the RSI with the aspect ratio of 3,the ramp angle of 6°,the characteristic parameter of the throat of 0.20,the ramp length of 1 337 mm,and the cone angle of 3° obtains the largest MFR value of about 2.251 kg/s.

帆片结构张满度变化对环帆伞气动性能的影响

该文以某型环帆伞为研究对象,基于稳降状态下环帆伞的气动外形建立了伞衣绕流流场数值模型,通过对不同帆片排气方向下环帆伞尾流、伞衣缝射流和伞衣表面压力等进行研究,分析帆片结构对环帆伞减速及稳定性能的影响及其原理,在此基础上探究了张满度变化对环帆伞气动性能的影响。结果表明:向上排气结构环帆伞受通过月牙缝顺流气柱的作用,轴向阻力减小,但偏离平衡位置时伞衣获得恢复力矩,因此与向下排气伞衣相比,阻力系数减小,稳定性增强;随着帆片结构张满度的增加,向上排气伞衣阻力系数增大,向下排气伞衣阻力系数减小;2种排气方向的环帆伞均存在稳定性能最优的张满度值。研究结果对改进环帆伞设计提供了一定的理论参考。