| 原型与模型泵装置压力脉动的相似性 |
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| 引用本文： | 许哲,刘雪芹,许雪梅,梁云辉,郑源,仲子夜,万景红,戴启璠.原型与模型泵装置压力脉动的相似性[J].排灌机械工程学报,2023,41(3):224-230. |
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| 作者姓名： | 许哲 刘雪芹 许雪梅 梁云辉 郑源 仲子夜 万景红 戴启璠 |
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| 作者单位： | 1. 河海大学水利水电学院, 江苏 南京 210098; 2. 江苏省水利勘测设计研究院有限公司, 江苏 扬州 225000; 3. 江苏省灌溉总渠管理处, 江苏 淮安 223200 |
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| 摘 要： | 为研究原型与模型泵装置压力脉动的相似性,根据相似性理论推导了原型与模型泵压力脉动幅值的相似性变换假设,并采用数值模拟的方法进行验证.以淮安四站为研究对象,采用CFX对原型与模型轴流泵装置进行数值计算,对泵段的压力脉动结果进行时域及频域分析.采用流量进口边界条件及自由出流边界条件,湍流模型采用SST k-ω模型.基于高精度水力机械试验台进行水泵工况的模型试验,验证了数值计算方法的可靠性.研究结果表明:叶轮域进口处压力脉动的主频皆为叶频,而叶轮域出口处监测点的压力脉动主频为叶频或导叶频;原型与模型泵装置相应监测点处的压力脉动的主频保持一致,且对应监测点处主频幅值亦保持一致;在一定程度上数值计算结果验证了原型与模型泵压力脉动幅值的相似性假设,尤其当原型与模型泵机组满足力学相似且两者的nD值保持一致时,对应压力脉动的幅值亦保持一致.
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| 关 键 词： | 原型 模型泵 相似定律 压力脉动 主频 数值计算 |
| 收稿时间： | 2021-08-18 |
Similarity of pressure fluctuation between prototype and model pumps |
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| XU Zhe,LIU Xueqin,XU Xuemei,LIANG Yunhui,ZHENG Yuan,ZHONG Ziye,WAN Jinghong,DAI Qifan.Similarity of pressure fluctuation between prototype and model pumps[J].Journal of Drainage and Irrigation Machinery Engineering,2023,41(3):224-230. |
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| Authors: | XU Zhe LIU Xueqin XU Xuemei LIANG Yunhui ZHENG Yuan ZHONG Ziye WAN Jinghong DAI Qifan |
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| Institution: | 1. College of Water Conservancy and Hydropower, Hohai University, Nanjing, Jiangsu 210098, China; 2. Jiangsu Water Conservancy Survey and Design Institute Co., Ltd., Yangzhou, Jiangsu 225000, China; 3. Jiangsu Province General Irrigation Canal Management, Huai′an, Jiangsu 223200, China |
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| Abstract: | In order to study the similarity of the pressure pulsation between the prototype and model pump device, the similarity transformation hypothesis of pressure pulsation amplitude of the prototype and model was derived based on the similarity theory, and the hypothesis was verified by numerical simulation. Taking the Huai′an Fourth Station as the research object, the prototype and model axial-flow pump devices were numerically calculated using CFX, and the pressure fluctuation results of the pump section in time and frequency domains were investigated. Mass flow inlet boundary conditions and ope-ning outlet boundary conditions were used, and the SST k-ω turbulence model was adopted. The reliability of the numerical calculation method was verified by the model test of the pump working condition based on the high-precision hydraulic machinery test bench. The results show that the dominant frequency of pressure pulsation at impeller inlet is impeller blade passing frequency, while the main frequency of pressure pulsation at impeller outlet is the blade passing frequency of impeller or guide vanes. The dominant frequencies of pressure pulsation at the corresponding monitoring points of the prototype and model pump unit are consistent, and the corresponding amplitudes of the main frequency are also consistent. The simulation results have verified the similarity transformation hypothesis of pressure pulsation amplitude of the prototype and model devices to a certain extent. Especially, when the prototype and the model unit meet the mechanical similarity and the nD values are consistent, the corresponding pressure pulsation amplitudes are also consistent. |
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| Keywords: | prototype model pump similarity law pressure pulsation dominant frequency numerical simulation |
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