气液混输下侧流道泵内压力脉动特性研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (6) : 1-10.

论文

气液混输下侧流道泵内压力脉动特性研究

陈轲1，张帆1，洪锋2，曹璞钰1，袁寿其1，洪秋虹3

作者信息 +

Pressure fluctuation in a side channel pump under gas-liquid two-phase flow

CHEN Ke1，ZHANG Fan1，HONG Feng2，CAO Puyu1，YUAN Shouqi1，HONG Qiuhong3

Author information +

文章历史 +

摘要

侧流道泵是一种新型超低比转速泵，因其具有小流量、高扬程、可自吸和气液混输等优点，近年来广泛应用于化工、汽车、医药工业和油气开采等领域。由于侧流道泵内部流动复杂、湍流强度极大，势必会产生较强的压力脉动，造成侧流道泵性能降低和运行不稳定，这种影响在气液混输时更为严重。基于MUSIG模型，对不同含气率下侧流道泵内部流动进行数值计算，并对气液混输工况下侧流道泵压力脉动特性进行研究分析。结果表明：MUSIG模型可适用于侧流道泵气液混输数值计算；少量通气有助于改善侧流道泵内绝大部分区域流态，但会导致轴向间隙处出现严重的压力脉动，这也是侧流道泵气液混输时运行不稳定的主要因素；低进口含气率(inlet gas volume fraction，IGVF)下，压力脉动主频与含气量无关，始终等于轴频的整数倍；叶轮内压力脉动幅值始终大于侧流道的压力脉动幅值。该研究为气液混输工况下侧流道泵的优化设计提供基础依据，具有重要的工程应用价值。

Abstract

The side channel pump is a new type of super low specific speed pump.Due to its great merits such as low flowrate with high hydraulic head, great self-priming ability and especially gas-liquid two phase flow, recently, this kind of pump has been widely applicated in chemical industry, auto industry, pharmaceutical industry and oil & gas exploitation.However, the internal flow is very complex and the turbulence intensity is extremely high in side channel pumps, which is bound to produce strong pressure fluctuation, resulting in reduced performance and unstable operation of side channel pumps, and this effect is more serious in gas-liquid mixed transport.Numerical simulations were performed on the internal flow of a side channel pump under different inlet gas volume fraction (IGVF), and its pressure fluctuation characteristics were analyzed under two-phase flow.As can be seen from results, the MUSIG model can go for numerical simulations of the side channel pump under gas-liquid two-phase flow.A little gas inside is helpful to improve the flow pattern in most areas of the side channel pump, but it will lead to serious pressure fluctuation at the radial gaps, which is also the main factor for the unstable operation of the side channel pump when the gas-liquid mixture is transferred.The main frequency of pressure fluctuation is independent of the IGVF and is always equal to multiple of shaft frequency.The pressure fluctuation in impeller is always larger than that in side channel.This study provides the basis for the optimal design of side channel pumps in gas-liquid mixed transport condition and has important engineering application value.

导出引用

陈轲1，张帆1，洪锋2，曹璞钰1，袁寿其1，洪秋虹3. 气液混输下侧流道泵内压力脉动特性研究[J]. 振动与冲击, 2021, 40(6): 1-10

CHEN Ke1，ZHANG Fan1，HONG Feng2，CAO Puyu1，YUAN Shouqi1，HONG Qiuhong3. Pressure fluctuation in a side channel pump under gas-liquid two-phase flow[J]. Journal of Vibration and Shock, 2021, 40(6): 1-10

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