Computational fluid dynamic analysis on flow and cavitation characteristics of R134a in centrifugal pump with straight blades

doi:10.3969/j.issn.0438-1157.2014.z2.007

CIESC Journal ›› 2014, Vol. 65 ›› Issue (z2): 45-51.DOI: 10.3969/j.issn.0438-1157.2014.z2.007

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Computational fluid dynamic analysis on flow and cavitation characteristics of R134a in centrifugal pump with straight blades

LAI Tianwei, YANG Shanju, ZHANG Xingqun, CHEN Shuangtao, HOU Yu

State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China

Received:2014-08-26 Revised:2014-09-02 Online:2014-12-30 Published:2014-12-30
Supported by:
supported by the National Natural Science Foundation of China (51306135, 51406157),the China Postdoctoral Science Foundation (2014M552438) and the Fundamental Research Funds for the Central Universities.

直叶片离心泵内R134a流动与空化特性的CFD分析

赖天伟, 杨山举, 张兴群, 陈双涛, 侯予

西安交通大学动力工程多相流国家重点实验室, 陕西西安 710049

通讯作者: 赖天伟
基金资助:
国家自然科学基金项目(51306135,51406157);中国博士后科学基金第55批面上资助项目(2014M552438);中央高校基本科研业务费专项资金项目。

Abstract

Abstract:

The performance of refrigerant circulation centrifugal liquid pump is of great importance for the stability and reliability of free cooling system. Emergence of cavitation is crucial for the liquid pump, especially for that works near liquid saturation. In this paper, flow and cavitation characteristics in centrifugal liquid pump with straight blades are analyzed numerically with computational fluid dynamic (CFD) tools CFX based on Rayleigh-Plesset cavitation model, and the effect of rotational speed on the flow field distribution and cavitation is evaluated. Numerical results indicate that cavitation appears firstly in the upstream region around leading edge of blade with rotational speed, and that the adherent cavitation area enlarges near the suction surface of blade with the increase of rotational speed. Meanwhile, flow streamline turbulence is prominent and the secondary flow is obvious in the pump with straight blade.

Key words: pump, bubble, two-phase flow, computational fluid dynamics

摘要：

作为自然冷却系统的核心部件,离心式制冷剂液体泵的性能直接决定着系统的稳定性与可靠性。对于工作在近饱和区域的液体泵,气蚀问题尤为突出。采用计算流体力学CFX软件,基于Rayleigh-Plesset空化模型对直叶片离心式液体泵叶轮内的流场与空化特性进行了数值分析,研究了离心泵叶轮转速对泵内R134a流动和空化的影响规律。数值结果表明,在进出口状态参数保持稳定的情况下,增加转速会在叶片前缘的上游区域率先产生空化,进一步增加转速会在叶片的吸力面形成较大的随体空化区域。同时,直叶片内流线较为紊乱,二次流比较显著。

关键词: 泵, 气泡, 两相流, 计算流体力学

CLC Number:

TB65

LAI Tianwei, YANG Shanju, ZHANG Xingqun, CHEN Shuangtao, HOU Yu. Computational fluid dynamic analysis on flow and cavitation characteristics of R134a in centrifugal pump with straight blades[J]. CIESC Journal, 2014, 65(z2): 45-51.

赖天伟, 杨山举, 张兴群, 陈双涛, 侯予. 直叶片离心泵内R134a流动与空化特性的CFD分析[J]. 化工学报, 2014, 65(z2): 45-51.

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Computational fluid dynamic analysis on flow and cavitation characteristics of R134a in centrifugal pump with straight blades

直叶片离心泵内R134a流动与空化特性的CFD分析

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