一种提高后掠侧压式进气道流量系数的有效措施

在一种双楔顶压、侧板中置的常规后掠侧压式进气道基础上通过减小顶板第二压缩角,引入圆弧压缩面设计了一种具有较高流量系数的进气道.利用Fluent商业计算软件对比研究了该进气道与常规进气道在Ma=6和Ma=4下的流动特征及性能.研究发现,新的改进措施能在几乎不降低进气道总压恢复系数的前提下大幅度提高流量系数:在Ma=6来流条件下,改进后的进气道流量系数为0.87,比常规进气道提高14.5%;在Ma=4来流条件下,流量系数为0.69,提高了19%.

An efficient method for increasing mass flow capture ratio of a three-dimensional sidewall compression scramjet inlet

For a typical backward-sweep sidewall compression scramjet inlet with two ramps and mid-located sidewalls,a modified inlet with higher mass flow capture ratio was designed by reducing the second ramp angle and using circular arc compression surface.The flow filed was numerically simulated and comparisons were made between the modified inlet and the typical one at the free stream Mach number of 6 and 4.Numerical results indicate that most of the performance parameters of the modified inlet are obviously improved and the mass flow capture ratio is greatly increased by using the new method.At Mach 6 incoming condition,the mass capture ratio of the modified inlet was 0.87,which was 14.5 percent higher than that of the typical one;at Mach 4 incoming condition,the mass flow capture ratio was 0.69,19% percent higher than that of the typical one.