跨超声速风洞大开角段设计技术研究

摘要

跨超声速风洞大开角段设计技术研究对于提高大开角段的安全性能与改进稳定段入口气流质量有着重大意义.由于影响大开角段性能的参数较多,完全通过试验方法进行设计的成本过高.本文通过数值模拟方法,结合适当的边界条件,对不同参数的大开角段进行了模拟,从数值模拟的结果可以看到,孔板开孔率和扩开角对大开角段性能有显著影响,通过比较得出了较为合理的参数匹配.这表明本文所用的方法用于大开角段气动设计是可行的,这为数值模拟方法应用于风洞部段气动设计创造了一定的条件.%Design technology of transonic wind tunnel's wide angle diffuser(WAD) plays an important role in the improvement of the diffuser's security.This paper is about study of the design technology of transonic wind tunnel's WAD.It presents the control equations and boundary conditions for numerical simulation.Then the details of numerical results are given.In the last, conclusions about wide angle diffuser are listed that angle of diffuser and open - area ratio of perforated plate which could significantly reduce or eliminate steady separation must be exactly set.These parameters inside the WAD could produce a more uniform velocity profile entering setting chamber.Conclusions state the importance and feasibility of CFD in aero dynamical design of wind tunnel.