Study on the Impact of Gas Content in Inflow Conditions on the Performance of Residual Heat Removal Pumps with Splitter Blades

GAO Junhao; YANG Yao; LIU Lei; ZHOU Chenyu; LIU Lijun

doi:10.7652/xjtuxb202507013

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Study on the Impact of Gas Content in Inflow Conditions on the Performance of Residual Heat Removal Pumps with Splitter Blades

更新时间：2025-07-09

- Study on the Impact of Gas Content in Inflow Conditions on the Performance of Residual Heat Removal Pumps with Splitter Blades
- Journal of Xi’an Jiaotong University Vol. 59, Issue 7, Pages: 129-139(2025)
- 作者机构：
  
  西安交通大学能源与动力工程学院， 710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202507013
  CLC： TH311
- Received：15 January 2025，
  
  Online First：11 April 2025，
  
  Published：10 July 2025
- 稿件说明：
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GAO Junhao, YANG Yao, LIU Lei, et al. Study on the Impact of Gas Content in Inflow Conditions on the Performance of Residual Heat Removal Pumps with Splitter Blades[J]. Journal of Xi’an Jiaotong University, 2025, 59(7): 129-139.
DOI：

GAO Junhao, YANG Yao, LIU Lei, et al. Study on the Impact of Gas Content in Inflow Conditions on the Performance of Residual Heat Removal Pumps with Splitter Blades[J]. Journal of Xi’an Jiaotong University, 2025, 59(7): 129-139. DOI： 10.7652/xjtuxb202507013.

摘要

针对核电站余热排出系统（RRA）核心设备余排泵的工作环境处于恶劣的气液两相状态，研究含气对其扬程及效率的影响及影响机理。基于SST

湍流模型和欧拉-欧拉非均相模型，对带有分流叶片的余排泵在不同气相体积分数及气泡尺寸下进行数值模拟，分析叶轮中后段速度变化及泵内气相分布情况，探寻气相存在对余排泵性能影响及其机理。结果表明：来流含气会增大水力损失，气相体积分数为5%和10%时，扬程分别下降约9.2%和20.0%，效率分别下降约6.4%和12.5%。余排泵内气相主要分布在叶片压力面侧、分流叶片进口及叶轮导叶间隙处；气相的存在使分流叶片进口段的相对速度在叶片吸力面增幅大于压力面，形成脱流和漩涡，为气相聚集创造条件；叶轮出口绝对速度也发生变化，与不含气的情况相比，气相体积分数为5%和10%时，出口绝对速度平均值分别下降了4.5%和8.9%，且绝对速度在叶片吸力面侧增加，压力面侧下降，加剧了出口流动的不均匀性及导叶内的水力损失。该研究结果可为气液两相工作条件下带分流叶片的余排泵设计提供技术参考，并可推广至其他带分流叶片的离心泵。

Abstract

Given that the residual heat removal pump (RHRP)

a core component of a nuclear power plant's residual heat removal system (RRA)

operates under harsh gas-liquid two-phase conditions

the influence of gas content on its head and efficiency

as well as the underlying mechanisms are investigated. Based on the SST

turbulence model and the Euler-Euler multiphase model

numerical simulations are conducted on an RHRP with splitter blades under varying gas volume fractions and bubble sizes. This study analyzes the velocity variations in the middle and rear sections of the impeller and the gas phase distribution inside the pump

exploring the impact of gas presence on RHRP performance and its mechanisms. The results indicate that gas content in the inflow conditions increases hydraulic losses: at gas volume fractions of 5% and 10%

the head decreases by approximately 9.2% and 20.0%

respectively

while efficiency drops by ab

out 6.4% and 12.5%. Gas primarily accumulates on the pressure side of the blades

at the inlet of the splitter blades

and in the gaps between the impeller and guide vanes. The presence of gas causes a greater increase in relative velocity on the suction side than on the pressure side at the inlet of the splitter blades

leading to flow separation and vortex formation

which promote gas accumulation. Additionally

the absolute velocity at the impeller outlet changes—compared to gas-free conditions

the average absolute velocity decreases by 4.5% and 8.9% at 5% and 10% gas content

respectively. Moreover

the absolute velocity increases on the suction side and decreases on the pressure side

exacerbating flow non-uniformity at the outlet and hydraulic losses in the guide vanes. These findings provide technical guidance for the design of RHRPs with splitter blades under gas-liquid two-phase conditions and can be extended to other centrifugal pumps with splitter blades.

关键词

Keywords

references

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