基于数值试验的水轮机改造新方法

A new approach for retrofit of hydraulic turbines with numerical simulation

传统的水轮机改造方法是针对水电站水轮机中拟改造的过流部件和实际运行条件,采用类似新电站设计的多方案设计和模型试验进行性能对比来论证改造方案和验证设计.在水轮机改造过程中,因受到了已有流道的限制,其过流部件与新建电站的设计思路有很大的差异.根据水轮机改造中过流部件设计的特点,基于数字化设计与试验的思想,对全流道进行联合的三维粘性流动数值模拟.在数值模拟的基础上进行性能预测,以数值试验取代模型性能试验,提出一套基于数值试验的水轮机改造技术,并简介该技术在水电站水轮机改造中的实际应用情况.

The traditional way of the retrofit of hydraulic turbines is to demonstrate and verify the modification plan and the design of the flow passage in the hydraulic turbine to be modified and its actual operation condition with the method similar to the design of a new hydro-power station,that is to say,the design is to be made with the comparison of several alternatives and the model tests concerned.However,there are big differences in the design concepts between the flow passage in the turbine of a new hydro-power station and the flow passage in an existing one that is to be retrofitted,as the latter is restricted by the existing flow passage.In accordance with the design features of the flow passage in the turbine to be retrofitted,a numerical simulations of 3D viscous flow inside the full flow passage of the hydraulic turbine to be retrofitted is made based on the concepts of the digital design and the numerical simulation,and then a technology based on the numerical simulation for the retrofit of hydraulic turbine is put forward by means of estimating the performances of the retrofitted hydraulic turbine with the numerical simulations and replacing modeling test with the numerical tests.Furthermore,the actual application case of this approach is briefly described herein as well.