來流含氣條件對(duì)帶分流葉片的余排泵性能影響

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關(guān)鍵詞：余排泵；氣液兩相；分流葉片；揚(yáng)程；效率

中圖分類號(hào)：TH311文獻(xiàn)標(biāo)志碼：A

DOI：10.7652/xjtuxb202507013 文章編號(hào)：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

核能作為綠色能源，因其生態(tài)影響小、能量密度高且供電響應(yīng)迅速等特點(diǎn)[1-2]，已成為能源結(jié)構(gòu)調(diào)整的重要選項(xiàng)，但是核電的安全運(yùn)行仍是主要關(guān)注點(diǎn)，尤其在福島核事故后，各國努力提高核電的安全性[3-4]。（剩余17212字）