共查询到19条相似文献,搜索用时 375 毫秒
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基于FLUENT的潜水搅拌器搅拌流场分析 总被引:1,自引:0,他引:1
对于潜水搅拌器的搅拌流场,采用基于雷诺时均方程和标准k-ε方程的湍流模型,以及贴体坐标和交错网格系统对N-S方程用有限体积法进行离散,采用交错网格存放变量,用SIMPLEC算法求解N-S方程,应用Fluent软件对三维不可压湍流搅拌流场进行数值模拟。结果表明:搅拌器叶轮运行时产生旋向射流,中心速度较快,向外做扩展运动,利用体积流来输送液体。通过调整潜水搅拌器的安装深度和改变搅拌器叶轮的重要设计参数轮毂比的大小,对所得到的模拟结果进行对比分析,提出优化的安装和设计方案。 相似文献
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《机械制造与自动化》2016,(1)
对锚式搅拌器的研究大多采用试验的方法,现采用数值模拟软件对锚式搅拌器进行研究。对无拉杆、带水平拉杆和带水平垂直拉杆等3种锚式搅拌叶轮在不同雷诺数的流体中进行数值模拟,得到了槽内流体的流场特性,分析对比了拉杆对锚式搅拌叶轮功率消耗的影响。结果表明,放置水平拉杆的锚式叶轮对功率消耗无明显影响,而且同时放置水平和垂直拉杆的锚式叶轮,对功率消耗也无明显影响。模拟结果与文献试验结果相符。 相似文献
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《通用机械》2019,(10)
为提升高比转速潜水排污泵在大流量工况下的空化性能,通过增大叶片进口安放角、减小包角的同时前移叶片进口边的方法,在不改变叶轮外形尺寸的基础上对叶轮叶片进行优化。基于CFD数值计算,预测了3个流量工况下的优化方案(方案二)高比转速潜水排污泵的外特性性能和空化性能,并与原有方案(方案一)的性能进行了对比分析。结果表明:随着空化余量的降低,叶轮进口边附近逐渐产生低压区,主要集中在叶片进口边背面。在叶轮外形尺寸不改变的基础上,增大叶片进口安放角、减小包角的同时前移叶片进口边,不仅可以提高高比转速潜水排污泵的外特性性能,还可以提高大流量工况时的空化性能。在流量为1 500 m~3/h时,必需空化余量仅为5.37m,比原有方案的空化性能提升了6.24m。 相似文献
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针对泵轴和叶轮是用锥形套联接并传递扭矩方式的井用潜水电泵,给出了并用潜水电泵叶轮内孔及锥形套外径极限偏差的合理设计方案,解决了潜水电泵由于锥形套的接触面积不够大,在运行中经常出现叶轮脱落的现象,并举实例进行计算。 相似文献
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Kan Kan Yuan Zheng Shifeng Fu Huiwen Liu Chunxia Yang Xin Zhang 《Journal of Mechanical Science and Technology》2017,31(4):1561-1568
Current research on the stability of tubular pumps is mainly concerned with the transient hydrodynamic characteristics. However, the structural response under the influence of fluid-structure interaction hasn’t been taken fully into consideration. The instability of the structure can cause vibration and cracks, which may threaten the safety of the unit. We used bidirectional fluid-structure interaction to comprehensively analyze the dynamic stress characteristics of the impeller blades of the shaft extension tubular pump device. Furthermore, dynamic stress of impeller blade of shaft extension tubular pump device was solved under different lift conditions of 0° blade angle. Based on Reynolds-average N-S equation and SST k-ω turbulence model, numerical simulation was carried out for three-dimensional unsteady incompressible turbulent flow field of the pump device whole flow passage. Meanwhile, the finite element method was used to calculate dynamic characteristics of the blade structure. The blade dynamic stress distribution was obtained on the basis of fourth strength theory. The research results indicate that the maximum blade dynamic stress appears at the joint between root of inlet side of the blade suction surface and the axis. Considering the influence of gravity, the fluctuation of the blade dynamic stress increases initially and decreases afterwards within a rotation period. In the meantime, the dynamic stress in the middle part of inlet edge presents larger relative fluctuation amplitude. Finally, a prediction method for dynamic stress distribution of tubular pump considering fluid-structure interaction and gravity effect was proposed. This method can be used in the design stage of tubular pump to predict dynamic stress distribution of the structure under different operating conditions, improve the reliability of pump impeller and analyze the impeller fatigue life. 相似文献
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依据风机叶轮具有的旋转对称性,用 Cn 群的表示理论,导出了群各不可约子空间的特征方程,方程的阶数低,易计算,更便于工程应用,且群论方法可以给出叶轮的模态特征 相似文献
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对输运液氢的离心式液氢泵进行低温结构设计与动力单元分析,叶轮是速度能转变为压力能获得高压流体的重要部件,对离心泵的稳定输出特性有较大的影响。其中,转子(包括转轴和叶轮)是连动部件,也属于低温泵结构性传热部件。对应用于储运系统的某小流量高压头的离心式液氢泵的叶轮和转轴部件,进行功能分区,利用CFD内嵌模块对其进行数值计算。根据运行系统中输送载荷,对低温条件下的转子部件进行热-结构耦合瞬态应力应变分析,获得其动力特性;采用流固耦合方法,对叶轮区的流体域进行数值计算,分析不同流体载荷下叶轮表面应力分布;对低温离心泵轴-叶轮的传热区进行设计,分析低温-室温隔热效果,为离心式液氢泵的设计研发、结构优化和性能改进提供理论依据和参考。 相似文献
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Tae-An Kim D. -W. Kim S. -K. Park Youn J. Kim 《Journal of Mechanical Science and Technology》2008,22(10):1876-1882
A cross-flow fan having forward curved blades relatively produces higher dynamic pressure at low rotating speed because a
working fluid passes through an impeller blade twice. Most of this dynamic pressure is transferred to the static pressure
in a rearguider and a stabilizer as a scroll in the centrifugal fan. The effect of a rearguider and a stabilizer on the performance
of a cross-flow fan is higher than that of the impeller. Therefore, it should be considered how the shape of a rearguider
and an exit duct affects on the performance and the flow fields. The purpose of this study is to investigate the reciprocal
relation to the flow field and performance among the design parameters. Two-dimensional, unsteady governing equations are
solved using FVM algorithm, sliding grid system and standard k - ɛ turbulence model. Verlocity profiles with various parameters are depicted. Furthermore, the meridional velocity profiles
around the impeller are plotted at fixed rotating speed and design flow rate.
This paper was presented at the 9th Asian International Conference on Fluid Machinery (AICFM9), Jeju, Korea, October 16–19, 2007. 相似文献