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为系统揭示泵入口气液流型随入口含气率(Inlet Gas Volume Fraction,IGVF)变化的演变规律,及其对泵整体性能和叶轮内气体分布特征的影响。文章在不同IGVF、液体流量条件下开展实验，对不同工况下的离心泵性能损失和气液流型进行研究。结果表明：当泵在接近额定流量工况运行时，其性能随IGVF的增加持续下降。在小流量(Ql=0.6QlBEP, IGVF=8%)工况下，诱导轮区域会出现气液分离现象；在大流量(Ql=1.4QlBEP, IGVF=13.6%)工况下，叶轮流道内也会出现严重的气液分离现象；这两种气液分离现象均导致了泵性能的突降。随着IGVF的增加，入口段的气液流型依次由泡状流Ⅰ演变为泡状流Ⅱ，最终发展为塞状流。当入口段气液流型呈泡状流Ⅱ或塞状流时，大尺寸的气泡团不均匀的冲击诱导轮叶片，导致泵性能随IGVF增大的损失达到最大，而泡状流Ⅰ则相对缓和。增大流量可使得入口管内气液分布更加均匀并推迟泡状流Ⅱ和塞状流的出现，但也会加快气泡在叶轮入口处聚集，诱发通道内气液分离，对泵运行造成不利影响。
Abstract：This study aims to systematically clarify how the gas-liquid flow patterns at the pump inlet evolve with varying inlet gas volume fraction(IGVF) and how these changes affect the overall pump performance and gas distribution within the impeller. Experiments are conducted under various combinations of IGVF and liquid-phase flow rates to investigate the centrifugal pump's performance losses and gas-liquid flow regimes over a range of operating conditions. The results show that when the pump operates near the design flow rate, its performance decreases with increasing IGVF. At low flow(Ql = 0.6 QlBEP, IGVF = 8%), gas-liquid separation occurs in the inducer region; at high flow(Ql = 1.4 QlBEP, IGVF = 13.6%), severe gas-liquid separation develops in the impeller passages. Both scenarios precipitate an abrupt drop in performance. As IGVF increases, the inlet-section flow pattern transitions from bubbly flow Ⅰ to bubbly flow Ⅱ, and ultimately evolves into plug flow. When the inlet flow pattern is bubbly flow Ⅱ or plug flow, agglomerated large bubbles impinge non-uniformly on the inducer blades,producing the greatest performance loss as IGVF increases; by contrast, under bubbly flow Ⅰ, the degradation is comparatively mild. Increasing the liquid flow rate promotes a more uniform gas-liquid distribution in the inlet pipe and delays the onset of bubbly flow Ⅱ and plug flow; however, it also accelerates bubble accumulation at the impeller inlet, triggers phase separation within the passages, and thus adversely affects pump performance.
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基本信息:
DOI：10.13922/j.cnki.cjvst.202511011
中图分类号:TH311
引用信息:
[1]任芸,杨波,王玉超,等.离心泵内气液流型演变及其外特性的实验研究[J].真空科学与技术学报,2026,46(04):370-378.DOI:10.13922/j.cnki.cjvst.202511011.
基金信息:
浙江省自然科学基金项目（LMS25E060002）; 绍兴市基础公益类计划项目（2024A11018）
2026-01-28
2026-01-28
2026-01-28