【摘要】 本文旨次论述了具有自由边界的二维层流或湍流吹吸气流的数值计算方法。本文将具有速度梯度和气体能自由进出同一开口面上的边界称为“自由边界”。借助于自由边界的帮助可方便地确立出吹出气流和吸入气流流量的最佳组合即能方便地求出最小流量比。通过气流显示实验验证,本文提出的计算方法是十分成功和有效的。更多还原

【Abstract】 In this paper,the push-pull flow is assumed to be incompressible,two-dimensional,isothermal,laminar or turbulent.By introducing stream function and vorticity ω,and by transforming Navier-Stokes equation into stream function equation and vorticity transportation equation,the problem of lamilar flow is solved.The Navier-Stokes equation is solved with time-mean computation and the problem of turbulent flow is solved with one-equation model.The comparison between the computational results and the experimental data confirms the accuracy of the computation and the feasibility of the numerical analogue of the computer,In this paper,the numerical method for the flow passing freely through an open side is discussed for the first time.The boundary of an open side which permits the inlet and outlet flows with gradients of velocity simultaneously pass through it is called Free Boundary.With the concept of free boundary,the optimum combination of inlet and outlet flows can be easily determined,and so the minimum ratio of flow.更多还原