来流含气条件对带分流叶片的余排泵性能影响

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关键词：余排泵；气液两相；分流叶片；扬程；效率

中图分类号：TH311文献标志码：A

DOI：10.7652/xjtuxb202507013 文章编号：0253-987X（2025）07-0129-11

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 （School of Energy and Power Engineering，Xi'an JiaotongUniversity，Xi'an 71oo49，China）

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 k-ω 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 impeler 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 about 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 spliter blades under gas-liquid two-phase conditions and can be extended to other centrifugal pumps with splitter blades.

Keywords： residual heat removal pump; gas liquid two-phase system; splitter blades; head and efficiency

核能作为绿色能源，因其生态影响小、能量密度高且供电响应迅速等特点[1-2]，已成为能源结构调整的重要选项，但是核电的安全运行仍是主要关注点，尤其在福岛核事故后，各国努力提高核电的安全性[3-4]。（剩余17212字）