余热排出泵叶轮流固耦合特性分析

发布时间：2018-04-12 21:23

本文选题：泵 + 叶轮　；参考：《农业工程学报》2017年09期

【摘要】：余热排出泵长期在高温高压环境下运行,其结构的可靠性对整个机组的安全运行有着重要的影响。该文采用单向流固耦合方法研究了几种常用材料及增加叶轮盖板厚度对转子结构动力学特性的影响,同时对比了常温和高温下叶轮的振动特性。结果表明,余热排出泵高温运行时,叶轮的第1阶固有频率为394.17 Hz,较常温下升高了2.28%,远高于叶轮叶片通过频率。在各阶模态振型下,1Cr13MoS叶轮固有频率最大,ZG225-450叶轮固有频率最小。设计工况和偏工况下叶轮的应力及变形变化趋势基本一致,叶轮的变形随半径的增加而不断增大,最大变形量出现在后盖板叶轮出口处。叶轮的应力分布不均,最大应力均出现在叶片尾缘与后盖板接合处。沿着前盖板和叶片接合线,应力的峰值随前盖板厚度增加而减小。沿着后盖板和叶片接合线,增加后盖板厚度明显减小了应力峰值。高温和常温应力变化趋势基本一致,但是高温下叶轮应力明显高于常温。尤其在叶轮进口处附近,高温应力相对于常温应力增加超过300%。该研究结果为下一步进行更加复杂的动力学分析、疲劳分析以及结构优化提供参考。
[Abstract]:The residual heat discharge pump is operated under high temperature and high pressure for a long time. The reliability of its structure has an important effect on the safe operation of the whole unit.In this paper, unidirectional fluid-solid coupling method is used to study the effects of several common materials and increasing the thickness of impeller cover on the dynamic characteristics of rotor structure, and the vibration characteristics of impeller at room temperature and high temperature are compared.The results show that the first natural frequency of the impeller is 394.17 Hz when the waste heat discharge pump is running at high temperature, which is 2.28% higher than that at normal temperature, and far higher than the passing frequency of impeller blade.The maximum natural frequency of 1Cr13MoS impeller and the minimum natural frequency of ZG225-450 impeller are obtained under various modes.The variation trend of the stress and deformation of the impeller under the design and off-load conditions is basically the same. The deformation of the impeller increases with the increase of the radius, and the maximum deformation appears at the outlet of the impeller with the back cover plate.The stress distribution of the impeller is uneven, and the maximum stress occurs at the junction between the trailing edge of the blade and the back cover plate.Along the front cover plate and blade joint line, the peak stress decreases with the increase of the front cover plate thickness.Along the joint line between the back cover plate and the blade, the stress peak value is obviously reduced by increasing the thickness of the back cover plate.The variation trend of high temperature and room temperature stress is basically the same, but the impeller stress at high temperature is obviously higher than that at room temperature.Especially near the impeller inlet, the high temperature stress increases by more than 300 relative to the normal temperature stress.The results provide a reference for further complex dynamic analysis, fatigue analysis and structural optimization.
【作者单位】：江苏大学国家水泵及系统工程技术研究中心;
【基金】：国家科技支撑计划项目(2014BAB08B01) 国家自然科学基金青年基金(51409123) 江苏省自然科学基金青年基金(BK20140554) 江苏大学“青年骨干教师培养工程”
【分类号】：TM623

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