论文部分内容阅读
在反压条件下,对椭圆形等直隔离段进行了全三维数值仿真研究.结果表明:在对称的几何条件和边界条件以及均匀来流条件下,当来流马赫数较小时,流场与激波串结构基本对称;当来流马赫数较大(大于2)时,流场与激波串结构出现明显不对称现象,并且随着来流马赫数增大,这种不对称现象加剧.椭圆形隔离段抗反压能力随着长短半轴比减小逐渐增强,出口马赫数和温升比基本不受长短半轴比影响.不同来流马赫数下,当隔离段承受最大反压时,出口马赫数变化不大.
Under the condition of back pressure, the full three-dimensional numerical simulation of elliptical equivalent isolating sections is carried out. The results show that under the condition of symmetric geometry and boundary conditions and uniform flow, when the Mach number is small, The shock wave structure is basically symmetrical. When Mach Mach number is larger (greater than 2), the flow field and shock train structure appear obvious asymmetry, and this asymmetry aggravates with the increase of Mach number. The anti-backpressure capability of the elliptical isolation section gradually increases with the decrease of the ratio of the length to the length of the semi-axial section, and the Mach-number and the temperature rise at the exit are basically unaffected by the ratio of the length to the length of the semi-axial section. , The change of Mach number has not changed much.