| 混流泵瞬态启动性能及空化流场可视化试验 |
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| 引用本文： | 邹俊杰,潘强,张德胜.混流泵瞬态启动性能及空化流场可视化试验[J].排灌机械工程学报,2022,40(3):250-257. |
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| 作者姓名： | 邹俊杰 潘强 张德胜 |
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| 作者单位： | 1. 江苏航运职业技术学院轮机工程学院, 江苏 南通 226010; 2. 江苏大学国家水泵及系统工程技术研究中心, 江苏 镇江212013 |
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| 摘 要： | 为解决泵喷系统以及潜艇武器大型化和稳定化发展中的混流泵瞬态启动特性和诱导空化问题,结合混流泵外特性试验和高速摄影可视化技术,研究泵瞬态启动性能和空化流场特性.结果表明:在无空化启动时,启动时间和启动流量不影响混流泵的稳态性能,泵流量、转速和扬程同时刻达到稳态峰值,具有较好的同步性,泵扬程在启动初期具有明显的滞后性,设计流量下,启动扬程滞后时间约为启动时间的50%;在空化启动条件下,混流泵叶顶间隙最先出现空化,随着启动时间的增加,空泡云发展出“长条状”形状,随着进口压力的降低或进口流量的增大,空泡云逐渐呈现出“三角状”,最终发展到堵塞流道.通过高速摄影试验捕捉不同启动条件下混流泵流道内的空化形态演变,发现缩短启动时间、减小启动流量、增加泵进口启动压力是抑制启动空化发生的有效途径.
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| 关 键 词： | 混流泵 瞬态启动 流场 空化 可视化试验 |
| 收稿时间： | 2021-05-11 |
Transient start-up performance of mixed-flow pump and experimental study on visualization of cavitation flow field |
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| ZOU Junjie,PAN Qiang,ZHANG Desheng.Transient start-up performance of mixed-flow pump and experimental study on visualization of cavitation flow field[J].Journal of Drainage and Irrigation Machinery Engineering,2022,40(3):250-257. |
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| Authors: | ZOU Junjie PAN Qiang ZHANG Desheng |
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| Institution: | 1. School of Marine Engineering, Jiangsu Shipping Vocational and Technical College, Nantong, Jiangsu 226010, China; 2. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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| Abstract: | The transient start-up characteristics and induced cavitation instability of mixed-flow pump are the urgent problems that should be solved in the development of pump-jet system and submarine weapon towards large-scale and stabilization. The transient start-up performance and cavitation flow field characteristics of a mixed-flow pump were studied by means of pump external characteristic test and high-speed photography visualization technology. The results show that the start-up duration and flow rate do not affect the pump performance at steady operating condition if there is no cavitation appears during the start-up process. The pump flow rate, speed and head reach the steady-state peak at the same time, which showing a good synchronicity under different starting conditions. However, the variation of pump head during the early stage of start-up lags behind the shaft speed and flow rate, and the retardation time of head is 50% of the start-up period at design flow rate. Under the condition of cavitation start-up, the cavitation inception first appears at the tip clearance of mixed-flow pump. With the increase of start-up time, the cavitation could develops into a ″long strip″ shape. With the decrease of inlet pressure or increase of inlet flow, the cavitation could gradually presents a triangle-shaped, and finally blocks the channel between impeller blades. Based on the evolution of cavitation morphology in the flow passage of mixed flow pump under different starting conditions is captured through high-speed photography experiment. It is found that shortening start-up duration, reducing the start-up flow rate and increasing start-up pressure at the pump inlet are the effective ways to suppress the occurrence of start-up cavitation. |
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| Keywords: | mixed-flow pump transient start-up flow field cavitation visualization experiment |
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