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| Optimization analysis of vaned-diffuser of boiler water circulating pump based on orthogonal experiment |
| DUAN Xiaohui*, KONG Fanyu, ZHAO Ruijie, LIU Yingying, TAN Qianyan |
| National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract Orthogonal experiments were used to optimize the vaned diffuser of a boiler water circulating pump in the paper. The inletvane angle, diffusion angle, and throat area were selected as three factors in orthogonal experimental design. Each factor was subject to three levels, resulting in nine experimental designs. Fluid dynamics in every experimental design was calculated and analyzed by using CFD method. The performances of nine experimental designs were compared each other and a range analysis was conducted on the performances of nine experimental designs. The results showed that selected design factors played an important but different role in determining the characteristics of the pump.The three factors are in a rank such as inlet blade angel>throat area>diffusion angle to influence the pump characteristics from the most important to the least important.Specially, the inlet blade angle has a greater influence on the head than on the efficiency, however, the rest have an equal influence on both the head and the efficiency. According to the results of orthogonal experimental designs, the optimal design should be 16.2° inlet blade angle, 8° diffusion angle and 37×50 mm2 throat area.Since the predicted performance of the pump with original diffuser was in agreement with the measurement, the simulation data of nine experimental designs are accurate.It can be concluded that orthogonal experimental design method is applicable in the design of vaned-diffuser of boiler water circulating pump. By adjusting the primary and secondary important factors, the pump performance can be improved to provide areliable support toboiler water circulation in thermal power plants.
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Received: 02 August 2016
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