论文部分内容阅读
为减少冷却塔内小型混流式水轮机生产工艺过程的复杂性和较高的制造成本,以水动风机冷却塔内流量为3 000t/h的小型混流式水轮机为研究对象进行结构设计。通过CFD对设计后的水轮机模型进行全流道三维定常湍流数值模拟,数值模拟中采用单方程Spalart-Allmars湍流模型,假定水流为不可压缩流体,不考虑能量方程,仅将质量守恒和动量守恒作为控制方程。结果表明,所设计的小型混流式水轮机整体流态较好,水力性能稳定,在设计转速149r/min时,流量和出力均达到了驱动冷却塔内风机的要求,且水轮机效率较高。
In order to reduce the complexity and high manufacturing cost of the small Francis turbine in the cooling tower, the design of a small Francis turbine with a flow rate of 3000 t / h in the cooling tower of the hydrodynamic fan was taken as the research object. The full-channel three-dimensional steady turbulent numerical simulation of a full-channel hydraulic turbine model is carried out by CFD. The single-equation Spalart-Allmars turbulence model is adopted in the numerical simulation. The flow is an incompressible fluid and the mass conservation and momentum conservation are not considered Control equations. The results show that the designed small Francis turbine has good overall flow and stable hydraulic performance. The flow rate and output reach the requirements of fans in driving cooling tower at the design speed of 149r / min, and the turbine efficiency is high.