论文部分内容阅读
为了生成虚拟飞行仿真中的微下击暴流风场,本文提出了一种基于涡环原理的工程化非对称时变微下击暴流模型。考虑了空气粘性的作用,建立了有限粘性涡核模型,解决了诱导速度在涡核内分布不连续的问题。采用湍流自由射流理论求解涡环中心轴处诱导速度,避免了奇异值的产生。考虑造成涡环运动的因素,建立了随时间变化的非定常涡环模型。仿真结果表明:与解析法相比,本文采用的数值方法所耗机时短(仅需0.3871s),所得结果与解析法结果完全一致,计算结果精确;且得出的微下击暴流风场的分布与真实情况类似,可满足实时飞行仿真的需要。本文结果可为虚拟飞行实验提供一定的理论参考。
In order to generate micro-downburst wind field in virtual flight simulation, an engineering asymmetric time-varying micro-dropburst model based on vortex ring principle is proposed in this paper. Considering the effect of air viscosity, a finite viscous vortex core model is established, which solves the problem of the discontinuous distribution of induced velocity in the vortex core. The turbulent free jet theory is used to solve the induced velocity at the central axis of vortex ring and avoid the generation of singular values. Considering the factors that cause the vortex ring motion, an unsteady vortex ring model is established over time. The simulation results show that compared with the analytical method, the numerical method proposed in this paper consumes very short time (only 0.3871s), the results obtained are in good agreement with the analytical results, and the calculation results are accurate. The micro-blowout wind field Distribution and the real situation is similar to meet the needs of real-time flight simulation. The results of this paper can provide some theoretical reference for the virtual flight experiment.