中文摘要：

各种热电、核电厂排出的热污（废）水在直接进入环境流体之前，以多孔口浮射流的形式释放污水，并确保污水在排污口快速混合非常重要。精确地了解和预测多孔浮射流的特性与混合状况有很重要的意义。针对同向流动环境中多圆形孔口热水排放的情况，采用雷诺应力模型进行数值模拟，得到了不同流速比和不同射流温度下的流场和温度场、浮射流的轨迹线、轴线上温度和速度的衰减规律，并且分析了不同相对孔间距、流速比和射流温度对流场中流速和温度的影响。

英文摘要：

Before the thermal effluent released from thermal or nuclear power plants enters ambient water, it is important to ensure that high initial mixing could be achieved in the vicinity of discharging multi-ports in the form of buoyant jets. Therefore, definite understanding and predictions of the behaviour of buoyant jets and their mixing characteristics are of great significance. With reference to Reynolds stress model （RSM）, the buoyant jets of thermal effluent in co-flowing water were simulated. The velocity and temperature fields, buoyant jet trajectories, and the decline in temperature and velocity along the axis were obtained in the condition of different velocity ratios and different jet temperatures, meanwhile the effects of different relative spacing between ports, velocity ratios and jet temperatures on the current velocities and temperatures in the flow field were analysed.