径流式氨水混合工质透平热力设计和数值模拟

Thermodynamic Design and Numerical Simulation of a Radial-flow Turbine for Ammonia-Water Mixture

为了更好地研究氨水混合工质透平,提升Kalina循环系统整体性能,对径流式氨水混合工质透平进行了一维热力学设计,并使用BladeGen、TurboGrid和ANSYS CFX软件进行三维数值模拟;将一维和三维建模方法分别与参考文献案例进行对比验证,并比较了透平一维热力计算与三维模型数值模拟的结果。结果表明:径流式氨水混合工质透平的性能通过热力设计模型估算,可大幅降低计算成本;透平一维热力计算与三维模型数值模拟得到的参数基本一致,所得透平等熵效率分别为84.67%和88.75%;工质在透平流道内流动均匀且无明显旋涡。

To better understand the ammonia-water mixed working fluid turbine and improve the circulatory system and overall performance of the Kalina system,a one-dimensional thermodynamic design of the turbine was conduced.The BladeGen,TurboGrid and ANSYS CFX software were used for three-dimensional model numerical simulations.One-and three-dimensional methods were compared with the case in the reference,then the results of one-dimensional thermodynamic calculation and three-dimensional model numerical simulation of the turbine were compared.Results show that the performance of the radial-flow ammonia-water mixture turbine can be accurately estimated using the thermal design model,which could greatly reduce the calculation cost.The parameters of the turbine obtained by one-dimensional thermodynamic calculation and three-dimensional model simulation are basically the same,and the isentropic efficiencies of the two methods are 84.67%and 88.75%respectively.In the flow path,the fluid flow presents smoothly and uniformly working while in absence of any vortex.