水泵叶轮的出口宽度对森林消防泵的性能有着极大的影响,根据水泵的外部特性要求,通过数值计算获得叶轮出口宽度。在保证叶轮的进出口安装角、进出口直径等其他参数不变的情况下,对叶轮的出口宽度设置参数变化,应用PRO/E软件进行叶轮的改型设计,使叶轮的出口宽度分别为8、10、12 mm,依次对各出口宽度进行计算流体动力学(CFD)数值模拟,以获得大流量、高扬程离心泵叶轮的最优出口宽度。实验表明:当叶轮出口宽度为8、12 mm时,叶轮内部流速与压力都没有达到最佳状态; 而当出口宽度为10 mm时,叶轮内部流场的速度最高可达40 m/s,最大压力可达2.0×105 Pa左右,且压力和速度分布均匀,此时最优运行工况效率为91.72%。通过离心泵野外试验验证,叶轮出口宽度为10 mm时的扬程与流量都达到了设定目标。
Abstract
Exit width of impeller has a vital impact on the performance of forestry fire pump.The optimum exit width of impeller was determined through numerical calculation in this paper. The exit width of impeller was optimized by means of PRO/E while the inlet and outlet blade angle, inlet and outlet diameter and other parameters kept unchanged. The exit width of impeller was set 8, 10 and 12 mm and then the performance of the forestry fire pump was simulated with respect to different exit widths of impeller by means of CFD(computational fluid dynamics),in an effort to obtain the optimal exit width for large head and large flow pump. It was calculated that exit width of impeller of 10 mm was the optimum dimension, with which the velocity and pressure fields of inner fluid were well distributed and can reach as high as 40 m/s and 2.0×105 Pa, and the optimum working efficiency could reach 91.72%. Experimental test in field confirmed pump with exit width of impeller of 10 mm could meet the requirement in terms of the head and the flow.
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基金
收稿日期:2014-07-05 修回日期:2015-06-02
基金项目:国家林业公益性行业科研专项项目(201304405),江苏省青蓝工程项目
第一作者:汪东(83184424@qq.com),博士生,副教授。
引文格式:汪东,周瑞琼,郑楠,等. 叶轮出口宽度对森林消防泵性能的影响及其优化[J]. 南京林业大学学报(自然科学版),2016,40(2):190-194.
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