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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第9期    总第313期    2020年9月

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文章编号:1672-7207(2020)09-2643-10
驼峰区内混流式喷水推进泵失速状态判别研究
李恩达1,李伟1, 2,施卫东3,马凌凌1,杨震宇1

(1. 江苏大学 流体机械工程技术研究中心,江苏 镇江,212013;
2. 江苏大学 镇江流体工程装备技术研究院,江苏 镇江,212009;
3. 南通大学 机械工程学院,江苏 南通,226019
)

摘 要: 为了对混流式喷水推进泵的驼峰区内失速状态进行判别,捕捉失速涡的位置、形态、尺度,基于RNG k-ε湍流模型对混流泵多工况下的内部流场进行数值计算。研究结果表明:伴随着旋转失速在叶轮流道内产生,混流式喷水推进泵扬程、效率皆呈现大幅度下降,能量损失严重;在叶轮进流面流动分离、出流面回流、旋转失速的综合作用下,混流式喷水推进泵在0.3Qdes~0.8Qdes的扬程曲线都呈现驼峰区特性;依据过流参数、内流特性、压力分布等评判指标对驼峰区各工况流动特性进行判别,明确了各工况下所对应的失速状态;通过捕捉初始失速工况下的失速涡,发现其紧附在叶片后缘吸力面侧,横跨整个叶轮流道,并有向下游叶片前缘延展趋势;失速状态下的来流在受到失速涡的卷吸效应及堵塞作用下,流动路径呈现多次偏折,部分来流在失速涡堵塞效应及泄漏流冲击的共同作用下,最终流向下游流道。

 

关键字: 混流式喷水推进泵;旋转失速;驼峰区;失速判别;涡动力学

Research on stall discrimination of a mixed-flow water jet pump in hump region
LI Enda1, LI Wei1, 2, SHI Weidong3, MA Lingling1, YANG Zhenyu1

1. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China;
2. Zhenjiang Fluid Engineering Equipment Technology Research Institute, Jiangsu University, Zhenjiang 212009, China;
3. School of Mechanical Engineering, Nantong University, Nantong 226019, China

Abstract:In order to distinguish the stall state in the hump region of the mixed-flow water jet pump and capture the position, structure and scale of the stall vortex, the internal flow field of the mixed flow pump under multiple working conditions was calculated based on RNG k-ε turbulence model. The results show that the head and efficiency of the mixed-flow water jet pump decrease sharply and the energy loss is serious with the occurrence of stall in the impeller path. Under the combined function of flow separation at impeller inlet, backflow at impeller outlet and rotating stall, the head curve of the water jet pump shows the characteristics of hump region under the working conditions from 0.3Qdes to 0.8Qdes. According to the evaluation indexes such as over-current parameters, internal flow characteristics and pressure distribution, the states of hump area are distinguished, and the stall states corresponding to each working condition are defined. Through the capture of stall vortex at initial stall point, it is closely attached to the suction surface of blade outlet across the whole impeller path, and has a trend of extending to the leading edge of the downstream blade. Under the action of the entrainment and blockage of the stall vortex, the flow path of the incoming flow in the stall state shows multiple deflections. Part of the incoming flow flows to the downstream path under the combined action of the blockage effect of the stall vortex and the impact of tip leakage flow.

 

Key words: mixed-flow water jet pump; rotating stall; hump region; stall discrimination; vortex dynamics

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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