Critical Hydraulic Eccentricity Estimation in Vertical Turbine Pump Impeller to Control Vibration

IF 0.9 Q4 ENGINEERING, MECHANICAL

International Journal of Rotating Machinery Pub Date : 2021-07-31 DOI:10.1155/2021/6643282

Ravindra S. Birajdar, A. Keste, S. Gawande

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引用次数: 3

Abstract

In many applications, pumps are tested against standard specifications to define the maximum allowable vibration amplitude limits of a pump. It is essential to identify the causes of vibration and methods to attenuate the same to ensure the safe and satisfactory operation of a pump. Causes of vibration can be classified mainly into mechanical and hydraulic nature. Respective unbalance masses are the two major factors which cause dynamic effects and excitation forces leading to undesirable vibrations. In this paper, the procedure of vibration magnitude measurement of a vertical turbine pump at site and the process of dynamic balancing to measure mechanical unbalance of an impeller are explained. After that, the impact of hydraulic eccentricity on the vibration displacement of a vertical turbine pump has been explained using numerical simulation procedure based on “One-way Fluid Structure Interaction (FSI).” The experimental results from a pump at site are used to compare the numerical results. After the solver validation, the one-way FSI approach is used to find the critical hydraulic eccentricity magnitude of a vertical turbine pump impeller to limit the vibration magnitudes on motor component to less than 100 μm. From the numerical simulations, it is deduced that the critical hydraulic eccentricity should be limited to 400 μm in X and Y direction. The process can be used as a guideline procedure for limiting the hydraulic unbalance in vertical turbine pumps by limiting the hydraulic eccentricity.

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立式涡轮泵叶轮控制振动的临界水力偏心估计

在许多应用中，根据标准规范对泵进行测试，以确定泵的最大允许振幅限制。必须确定振动的原因和衰减振动的方法，以确保泵的安全和令人满意的运行。振动的原因主要可分为机械性质和水力性质。各自的不平衡质量是导致动态效应和激振力的两个主要因素，激振力导致不期望的振动。本文介绍了立式涡轮泵振动幅值的现场测量过程和动平衡法测量叶轮机械不平衡量的过程。然后，利用基于“单向流固耦合”的数值模拟程序，解释了水力偏心对立式涡轮泵振动位移的影响。在求解器验证后，使用单向FSI方法来确定立式涡轮泵叶轮的临界水力偏心量，以将电机部件的振动量限制在100以下 μm。从数值模拟中推断，临界水力偏心率应限制在400 μm。该过程可作为通过限制水力偏心来限制立式涡轮泵水力不平衡的指导程序。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Rotating Machinery ENGINEERING, MECHANICAL-

CiteScore

2.40

自引率

0.00%

发文量

审稿时长

25 weeks

期刊介绍： This comprehensive journal provides the latest information on rotating machines and machine elements. This technology has become essential to many industrial processes, including gas-, steam-, water-, or wind-driven turbines at power generation systems, and in food processing, automobile and airplane engines, heating, refrigeration, air conditioning, and chemical or petroleum refining. In spite of the importance of rotating machinery and the huge financial resources involved in the industry, only a few publications distribute research and development information on the prime movers. This journal is the first source to combine the technology, as it applies to all of these specialties, previously scattered throughout literature.