温排水模型试验中变态率对流场和温度场的影响

Impact from distortion ration on flow field and temperature field in thermal effluent model test

通过设计一系列温排水模型试验,研究不同模型几何变态率对典型环境流条件下流场和温度场的影响。结果表明:变态率ε的增大(ε≤3)对典型流场的纵向流速以及水流特征点分布均有所影响,但都没有改变原有工况(ε=1)的流态特征和分布结构。随着变态率ε增大(ε≤3),温排水向上游发生偏转,表面温度场温升包络面积逐渐变大,主流区垂向温度分布规律基本没有发生变化,但垂向温度梯度加大,热水层厚度趋向变薄。

Through a series of thermal effluent model tests, the impacts from the geometric distortion ratios of various models on the flow field and temperature field under the condition of the typical environmental flow. The result shows that the increase of the distortion ratioε （ε≤3 ） has a certain impact on both the longitudinal velocity and the distribution of feature point of flow, but the characteristics of flow pattern and the distribution structure under the original working condition are not changed by the impact. Along with the increase of the distortion ratio ε（ε≤3）, the thermal effluent is deflected to the upstream and then the tempera- ture rising envelope area of the surface temperature field gradually becomes larger. Meanwhile, the law of the vertical tempera- ture distribution of the main flow region has basically no any change, but the vertical temperature gradient increases and the layer thickness of the hot water is inclined to be more thinner as well.