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用于空天往返的组合循环发动机工作马赫数范围宽,为此提出了一种采用双通道调节的变几何进气道设计方案:用一道隔板将进气道内压段分为上下2个通道,低马赫数时,上下2个通道同时进气,高马赫数时,通过旋转外压段最后一道压缩面关闭下通道后,仅上通道进气,从而实现进气道压缩角和收缩比的大范围调节。研究表明,该变几何进气道在Ma=2.2~7.0范围内具有较高的总压恢复系数,尤其是具有很高的流量系数,且大部分区间出口马赫数合适,该变几何进气道方案调节过程简单、可靠,容易实现。
For a wide range of combined cycle engine Mach number for space shuttle, a variable geometry inlet design with dual-channel adjustment is proposed. A partition is used to divide the internal pressure section into two upper and lower channels , Low Mach number, the upper and lower two channels at the same time intake, high Mach number, by rotating the outer surface of the last compression section of the lower channel closed, only the upper channel intake, inlet compression angle and contraction ratio Wide range of regulation. The results show that the variable geometry inlet has a higher total pressure recovery coefficient in the range of Ma = 2.2 ~ 7.0, especially with a high flow coefficient, and the outlet Mach number is suitable for most of the interval. The variable geometry inlet Regulation process is simple, reliable and easy to implement.