冲压发动机进气道和掺混段节流特性数值研究

Numerical study of the throttle characteristicabout the ramjet inlet and mixing section

关键词:  冲压喷气发动机  进气道  掺混段  节流特性  内外流场  一体化数值模拟

Key words:  Ramjet engine  Inlet  Mixing section  Throttle  Inner and outer flow  Integrated computational simulation

摘要:

为了研究冲压发动机进气道和掺混段节流特性及其内部的复杂流动,以同试验进行对比,采用二阶迎风隐式TVD格式,内外流分区求解可压缩N S方程,数值模拟弹体,进气道和掺混段一体化通气模型复杂流场。进气道为"X"型布局二元双楔平面压缩混压式进气道,掺混段为圆形截面。计算了掺混段出口反压比pt pt∞=3 5～5 5,总压恢复系数σ,流量系数φ及流场情况。同风洞试验结果比较表明:计算结果较为合理。通过对计算结果的分析,定性讨论了该冲压发动机的节流特性和掺混段内部复杂流动状况。

Abstract:

To investigate the characters of the throttle about the ramjet inlet and mixing section,while to compare with the experimental results, the second order upwind implicit TVD schemes were used to solve the compressible N-S equations for integrated simulating the complex inner and outer flowfields about the missile body, ramjet inlet and mixing section.The 2-D inlets with two compression plane were configured in "X" type. The mixing section is circle.The total pressure recovery coefficient　σ,the coefficient of the flux φ and the flowfields were presented, where the pressure ratio between mixing section exit and free stream p_t/p_t∞=3.5～5.5.The present results were compared with the experimental results.The complex flowfields were discussed.