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	考虑轴向间隙影响的挖泥泵轴向力数值分析
	刘瑞祥 ; 曹蕾 ; 张弋扬 ; 王正伟 ; Liu Ruixiang ; Cao Lei ; Zhang Yiyang ; Wang Zhengwei
	2016-03-30 ; 2016-03-30
关键词	离心泵 数值分析 叶轮 挖泥泵 轴向力 轴向间隙 副叶片 TH311
其他题名	Numerical analysis of axial force on dredging pump considering influence of axial clearance
中文摘要	转子所受的轴向力是关系到离心泵运行稳定性的重要问题,轴向力的大小和方向与离心泵的水力设计、结构设计中的许多参数都有相关性,其中叶轮盖板与蜗壳泵盖之间的轴向间隙是关键影响因素之一。为了量化地探究不同流量下轴向力特性与轴向间隙尺寸之间的关系,该文基于雷诺时均方程(Reynaolds-averaged Navier-Stokes equations,RANS),采用剪切应力传输(Shear Stress Transport)模型,即SST k-ω湍流模型,对一个前盖板含有后弯式副叶片的离心式挖泥泵进行了全流道数值模拟。考虑侧腔流域的多相位定常流动数值模拟得到了与试验测量结果非常吻合的外特性计算结果,各性能参数的计算误差均在5%以内。对该泵在3种轴向间隙下的外特性及轴向力变化规律进行了计算分析,结果表明:随前间隙的增大,泵的效率明显下降,扬程有不同程度的降低,轴功率变化不大;前、后盖板外表面所受轴向力随轴向间隙和流量的改变均有不同程度的变化,而叶轮内流道所受轴向力则基本不变,可视为定值;后盖板所受轴向力的绝对值最大,对总轴向力的方向及变化规律起着决定性作用,叶轮内流道所受轴向力的绝对值最小。随着前间隙的增大,前后盖板上的压力分布越来越均匀,而前后盖板上的速度沿径向均匀分布,基本不受轴向间隙变化影响。因此,在离心泵的水力设计中应综合考虑外特性、轴向力及加工成本,尽量减小前轴向间隙尺寸。本研究可为离心泵的优化设计提供参考。; It is an important issue that the axial forces exerting on rotors greatly affect the operation stability of centrifugal pumps.The axial clearance between the impeller shroud and the volute casing cover is a key factor that influences the magnitude and direction of the axial force.The axial force is mainly derived by pressure difference on the outer surface of front and back shrouds and hydraulic pressure on the inner surface of the impeller.The dredging pump studied in this paper was a shrouded centrifugal pump with 9 backward curved back blades on the front shroud.Adjusting the axial position of the impeller could simultaneously change the front clearance and back clearance.Numerical simulations were carried out for 3 axial clearances.Based on RANS numerical method,SST k-ω turbulence model was adopted to calculate the 3D turbulence flow in the whole flow passage of the pump.The impeller and the back-blade domain were set as rotating domains with the same rotational speed in the model test.The front and back shroud were set as rotating walls with the same rotational speed.For each operating condition,average values of the three were taken as the final results.The predicted efficiency,head and shaft power agreed well with the experimental results,which indicated the reliability of the numerical method.The relationship between axial clearance and characteristics of pump performance and axial force was analyzed within a wide range of flow rates.The numerical results showed that as the front clearance increased,the efficiency of the pump dramatically declined and the head decreased by different amplitudes,while the shaft power changed little.The component axial force on the back shroud was much larger than others,and thus it determined the direction of the gross axial force.By contrast,the component axial force on impeller inner surface was the smallest.The 3 components of axial force changed with flow rate and axial clearance on different levels.The total axial force gradually decreased as the flow rate increased,and it was the larger when the front clearance was wider.Affected by the rotating back blades,the pressure distribution on the front shroud was in disorder and the pressure gradient was large,while on back shroud,the pressure distribution presented smooth circles and the pressure changed uniformly in radial.As the front clearance increased,the pressure distribution became more homogeneous on both the front shroud and the back shroud.The pressure was larger on the back shroud than that on the front shroud,the area of the back shroud was larger,and hence the characteristics of the total axial force was determined by the component on the back shroud.Therefore,in the preliminary hydraulic design of dredging pumps,pump performance and axial force characteristics should be comprehensively considered and set suitable axial clearance sizes.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/148752]
专题	清华大学
推荐引用方式 GB/T 7714	刘瑞祥,曹蕾,张弋扬,等. 考虑轴向间隙影响的挖泥泵轴向力数值分析[J],2016, 2016.
APA	刘瑞祥.,曹蕾.,张弋扬.,王正伟.,Liu Ruixiang.,...&Wang Zhengwei.(2016).考虑轴向间隙影响的挖泥泵轴向力数值分析..
MLA	刘瑞祥,et al."考虑轴向间隙影响的挖泥泵轴向力数值分析".(2016).

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