论文部分内容阅读
利用计算流体力学方法建立了模拟龙卷风的装置模型,通过查阅相关文献中关于龙卷风在平面上的速度型,拟合成函数关系式后在三维CFD程序中设置速度初场以及相关的边界条件,之后匹配不同的初始温度场进行了关于龙卷风维持和发展的一系列数值模拟。重现并利用漩涡管的Ranque-Hilsch效应以及汇流换热原理分析了本文中两种不同的温度型对龙卷风内部流场变量随时间推移所发生的变化,同时揭示了龙卷风产生并维持下去的一种可能性,即冷热气流汇流换热生成温度场可能是产生和维持龙卷风的直接原因,并在此基础上提出使龙卷风削弱甚至消亡的方法,即破坏温度场。
A device model of simulated tornado was established by using computational fluid dynamics (CFD). By referring to the velocity profile of the tornado on the plane in related literatures, the velocity initial field and the related boundary conditions were set in the 3D CFD program after fitting the function formula. A series of numerical simulations on the maintenance and development of tornadoes were made to match different initial temperature fields. The Ranque-Hilsch effect of eddy-current tubes and the principle of confluence heat exchange were used to reproduce and analyze the changes of the internal flow field variables in the tornado over time with the two different temperature types in this paper. Meanwhile, the tornado generated and maintained The possibility that the temperature field generated by the exchange of cold and hot air flow may be the direct cause of the generation and maintenance of a tornado, and on this basis, a method of weakening or even extinguishing a tornado is proposed, namely, the destruction of the temperature field.