前缘水平投影可控的乘波体设计方法研究

结合流线追踪技术和密切面混合函数提出了一种前缘水平投影可控的乘波体设计方法,并完成了前缘水平投影为超椭圆的乘波体(Waverider-F)和超椭圆前缘转超椭圆后缘的乘波体(Waverider-FT)设计。二者具有较高的容积效率,前缘对应的轴向投影近似为余弦曲线。通过数值仿真验证了设计方法的有效性,设计点时Waverider-F的乘波特性良好且保持了基准流场的特点,Waverider-FT前部完全乘波,后部两侧诱导激波使流场变形且形成高压区,接力点时二者的乘波特性也较好。另外,二者具有较高的升阻比和预压缩效率,设计点时无粘升阻比分别为3.46和2.88。与Waverider-F相比,Waverider-FT的升力、阻力和出口增压比都明显增加,而升阻比、俯仰力矩和出口总压恢复系数降低。有粘条件下,设计点的升阻比由2.91降为2.41,对应的出口总压恢复系数降低了5.8%。

Design method of waverider with controlled horizontal projection of leading edge

A design method of waverider with controlled horizontal projection of leading edge is proposed in combination with streamline tracing technique and blend function of osculating plane, with which the waveriders with hyper elliptic horizontal projection of leading edge ( Waverider-F) and with hyper elliptic leading edge to hyper elliptic trailing edge transition ( Waverider-FT ) are de-signed. Both of them are of high volume ratio and their corresponding axial projection of leading edges is approximate to cosine curve. The effectiveness of the design method was validated by numerical sim-ulation. For design point, Waverider-F has good waverider characteristics and keeps the feature of ref-erence flow field. The forepart of Waverider-FT is a complete waverider, but the flow field is transfig-ured by both sides′induced shock of rear part and exists high pressure region. Their waverider charac-teristics are also good at relay point. Moreover, they are of high lift-drag ratio and pre-compression ef-ficiency. Under inviscid condition, their life-drag ratios are 3. 46 and 2. 88 for design point. In com-parison with Waverider-F, the lift force, drag force and exit compression ratio of Waverider-FT are significantly increased, and the lift-drag ratio, pitching moment and exit total pressure recovery coef-ficient are decreased. Under viscous condition, the lift-drag ratio at the design point decreases from 2. 91 to 2. 41 , its corresponding exit total pressure recovery coefficient reduces 5. 8%.