Abstract:In order to study the influence of the volute configurations on the radial force of the hydraulic turbine, the XWT 500-18 type hydraulic turbine in a chemical plant was selected as the research object. The SST k-ε turbulent model and the boundary layer grid were used to simulate hydraulic turbine with various volutes of single volute, double volute,in which the same impeller was adopted.The performance characteristics, pressure distribution and radial force of the hydraulic turbine with two different volutes were compared and analyzed according to the simulated results. The results show that the head and shaft power of single volute turbine are close to those of double volute turbine in all conditions. There is no advantage of performance in double volute turbine. The distribution of static pressure near the inlet of double volute impeller is not more uniform than that of single volute impeller due to the existence of the diaphragm. The radial force of the optimal point of the single volute turbine is the minimum which is half as large as that of double volute turbine. The radial force of the double volute turbine is higher than that of the single volute turbine overall while its balance is poorer. The direction and spiral angle of two kinds of turbines change greatly at small flow rates while its range is smaller at big flow rates. The results of the analysis can provide the reference of the understanding of the radial force and volute design in hydraulic turbine.
杨军虎, 李泰龙. 蜗壳结构对液力透平径向力的影响[J]. 排灌机械工程学报, 2015, 33(8): 651-655.
Yang Junhu, Li Tailong. Influence of volute configurations on radial force of hydraulic turbine. Journal of Drainage and Irrigation Machinery Engin, 2015, 33(8): 651-655.
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