Y形进气道流场数值研究

Y形进气道在两侧进气布局的单发轻型战斗机和教练机上应用较为普遍。由于流动的复杂．不易对其内部的流动进行实测．为此本文基于Favre平均的N-S方程和B／L代数湍流模型．采用了Jameson格式和矩阵人工粘性耗散，对某型亚声速飞机的Y形进气道流场进行了数值模拟。提出了一种解决网格块之间插值问题的处理方法．研究了进气道两侧管道气流的掺混作用及二次涡．得出了进气道内外流场的马赫数、压力和速度分布，以及进气道的性能随反压和攻角的变化曲线。研究结果可为进气道的设计提供一定的参考。

Numerical Computation for a Bifurcated Y-Inlet

Y-inlet is often used in combat aircraft with single-e n gine and training plane for its advantageous characteristics in aerodynamics and stealth. As a result of the complexity of the flow, experimental study is diffi cult and requires an elaborate experimental set-up. So computational fluid dyna mi cs(CFD) analysis is needed. Based on Favre-averaged three-dimensional compress ible Navier-Stokes equations and Baldwin-Lomax algebraic turbulence model, the Jameson scheme and matrix artificial dissipation of the flow dynamics viscosity are used for the simulation of a bifurcated Y-inlet flow field. An interpolati on method for data transmission between grid blocks is presented. The mixing of th e flows from the left and the right ducts is studied and the secondary vortices generated by them are also obtained. The characteristics of the flow field are d iscussed and the contour maps of Mach number and velocity distribution are descr ibed. Result can be referenced for the design of inlets.