内乘波式进气道内收缩基本流场研究

内收缩基本流场的设计直接决定了内乘波式进气道最终性能.编制二维轴对称特征线法程序,实现了来流马赫数6条件下的内收缩锥基本流场计算.提出以两道曲激波将内收缩锥流场划分为三个区域,反射激波与基本流场的交点所在平面流量平均参数作为内收缩锥基本流场的性能评价参数.分析发现,内收缩锥基本流场流动特征与平面二维流动和外锥流动存在显著不同,该类流场流动损失与二维平面流动相当,但压缩能力强.内锥角、中心体半径比两个几何参数对流场性能的影响具有相似规律,给出了相应表达式,从而为内乘波式进气道的设计提供了依据.

Investigation of internal compression flowfield for internal waverider-derived inlet

The performance of internal waverider-derived inlet is directly decided by the design of internal compression flowfield.In this paper,the 2D asymmetric method of characteristics(MOC) algorithm was applied to determine the internal compression flowfield in Mach 6 upstream.The flowfield was suggested to be divided into three parts by the two shocks and the mass averaged performance parameters on the exit plane were used for evaluation.The analysis result showed that the flow characteristic of internal compression flowfield is completely different from that of the 2D planar flow,which had better compression ability when the flow loss was almost the same.The two geometry parameters'(internal turning angle and radius ratio) effect on the performance was also analysized and some similarity principle was found,which will lead the design of internal compression flowfield and then the internal waverider-derived inlet.