同流热污水排放的三维数学模型及计算方法

3-D Mathematical Modelling and Its Calculational Method for Heated Water Jets in Co flowing Stream

重点给出了描述同轴单孔热浮力射流流动的三维数学模型和相应的计算方法，考虑了浮力对热排放的影响，最后结合典型且有效的试验资料进行计算，两者的对比表明，该模型和计算方法是可行的、有效的．从计算的表面压强分布看，采用“刚盖假定”来描述自由表面的边界条件，可以满足工程计算的要求．

Heat water jets in a co flowing stream is basic and important flow pattern in environmental engineering.The 3 dimensional mathematical model and its calculational method for this kind flow is given in this paper,and the buoyancy effect is considered in this mathematic model.This model and its numerical method is used to calculated the flow of thermal pollution in the steady state.Through the comparison between the calculated and experimental data,the method presented in this paper is feasible and effective.From the results of surface pressure,it can be meet the need for engineering simulation to use“rigid lid approximation”to describe the water surface.