泡状入流条件下离心泵喘振特性试验研究

doi:10.3901/JME.2022.10.289

机械工程学报 ›› 2022, Vol. 58 ›› Issue (10): 289-297.doi: 10.3901/JME.2022.10.289

• 可再生能源与工程热物理 • 上一篇下一篇

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泡状入流条件下离心泵喘振特性试验研究

贺登辉¹, 张振铎¹, 常壮¹, 郭鹏程¹, 白博峰²

1. 西安理工大学省部共建西北旱区生态水利国家重点实验室西安 710048;
2. 西安交通大学动力工程多相流国家重点试验西安 710049

收稿日期:2021-04-24 修回日期:2021-12-10 出版日期:2022-05-20 发布日期:2022-07-07
通讯作者: 贺登辉(通信作者)，男，1986年出生，博士，副教授，硕士研究生导师。主要从事流体机械多相流动及测试的研究。E-mail：hedenghui@xaut.edu.cn
基金资助:
国家自然科学基金(51839010,51709227)、陕西省自然科学基础研究计划(2019JQ-116)、陕西省教育厅青年创新团队建设科研计划(21JP087)和陕西高校青年科技创新团队(2020-29)资助项目。

Experimental Investigation on Surging Characteristics of Centrifugal Pump under Bubble Inflow Conditions

HE Denghui¹, ZHANG Zhenduo¹, CHANG Zhuang¹, GUO Pengcheng¹, BAI Bofeng²

1. State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi'an 710048;
2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049

Received:2021-04-24 Revised:2021-12-10 Online:2022-05-20 Published:2022-07-07

摘要/Abstract

摘要： 设计离心泵全流道可视化试验装置,结合高速摄像技术研究泡状入流条件下离心泵的喘振特性,揭示叶轮内气液相分布与泵喘振的关联机制,分析入口体积含气率、液相流量和转速对泵喘振特性的影响,并基于研究对象和试验结果,对比几个典型泵喘振临界体积含气率预测关联式。结果表明,离心泵的喘振主要受泵内气液两相分布影响,当叶轮内流型由气囊流转变为分离流时,泵发生喘振现象;入口体积含气率增加直接导致泵发生喘振,入口体积含气率的变化影响叶轮内流型,进而影响泵的性能;离心泵喘振条件下,通过合理调节液相流量来改变泵内流型,可以减轻泵的喘振;增加转速可以延缓叶轮内气液分离,推迟泵喘振现象发生,增加泵的携气能力,进而改善泵的性能。已有的喘振预测模型获得的临界体积含气率与试验结果相比尚存在一定的偏差,目前仍然缺乏针对蜗壳式离心泵的喘振预测模型。

关键词: 泡状流, 离心泵, 喘振, 压升, 效率

Abstract: A centrifugal pump is designed to obtain the flow in the whole impeller channel. The surging characteristics of the centrifugal pump are investigated by employing the high-speed camera technology. The correlative mechanism between the gas and liquid distribution in the impeller and the pump surging is discussed; then the effects of the inlet gas volume fraction, the liquid flow rate and the rotating speed on the pump surging characteristics are analyzed. Finally, several typical pump surging prediction correlations to predict the critical gas volume rate are compared based on the present test data. The results show that the centrifugal pump surging is mainly affected by the gas-liquid two-phase distribution in the impeller. The pump surging occurs when flow pattern in impeller transforms from gas-pocket flow to separate flow. The increase of inlet gas volume fraction is directly responsible for the pump surging phenomenon by affecting the flow pattern in the impeller, thus affects the pump performance. Under the condition of surging of centrifugal pump, the surging can be alleviated by reasonably adjusting the liquid flow rate to change the flow pattern of pump. In addition, the gas-liquid separation in the impeller is delayed by increasing the rotational speed and thus delays the pump surging occurrence, which increases the gas pumping ability. Consequently, the pump performance is improved. The critical gas volume fraction obtained by the existing surging prediction models are deviated with the experimental results. Thus, a surging prediction model for the volute centrifugal pump is urgently needed.

Key words: bubble flow, centrifugal pump, surging, pressure increment, efficiency

中图分类号:

TK72

贺登辉, 张振铎, 常壮, 郭鹏程, 白博峰. 泡状入流条件下离心泵喘振特性试验研究[J]. 机械工程学报, 2022, 58(10): 289-297.

HE Denghui, ZHANG Zhenduo, CHANG Zhuang, GUO Pengcheng, BAI Bofeng. Experimental Investigation on Surging Characteristics of Centrifugal Pump under Bubble Inflow Conditions[J]. Journal of Mechanical Engineering, 2022, 58(10): 289-297.

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泡状入流条件下离心泵喘振特性试验研究

Experimental Investigation on Surging Characteristics of Centrifugal Pump under Bubble Inflow Conditions

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