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为了探究前体构型对进气道气动特性的影响,在相同的压缩角度及几何长度下,设计了升力体前体和类乘波体前体两种构型方案。就不同构型对前体/进气道气动特性的影响开展了三维数值模拟研究,并与进气道二维流动进行了对比分析。结果显示,相比于进气道二维流动,三维升力体和类乘波体前体构型在设计状态和不同来流攻角下均存在一定的横向压力梯度,导致进气道流量捕获能力降低,与二维流动差异较大,前者流量系数下降20.3%,后者下降9.0%。相比较而言,类乘波体前体在流量捕获能力及升阻比等方面性能更优。增大类乘波体前体宽度比和前缘角度,可以减小前体横向压力梯度,提高前体/进气道的流量捕获能力,前者提高了升阻比,而后者则降低了升阻比。
In order to explore the influence of the precursor configuration on the aerodynamic characteristics of the inlet, two configurations of lift precursors and precursors were designed under the same compression angle and geometric length. Three-dimensional numerical simulation of the influence of different configurations on the aerodynamic characteristics of the precursor / air intake was carried out and compared with the two-dimensional flow in the air intake. The results show that compared with the two-dimensional flow inlets, there are some lateral pressure gradients in the three-dimensional lift-body and quasi-wavy precursor configurations at design state and at different angles of attack, resulting in the ability of intake flow trapping Lower, and two-dimensional flow difference is larger, the former flow coefficient decreased 20.3%, the latter decreased 9.0%. In comparison, the precursors of wave multiplication precursors have better performance in terms of flow capture capability and lift-drag ratio. Increasing the width-wise precursor ratio and the leading edge angle of the precursors can reduce the lateral pressure gradient of the precursors and improve the capacity of the precursor / inlet traps. The former increases the lift-drag ratio while the latter reduces the lift-drag ratio.