| 多级副叶轮密封的性能分析与应用 |
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| 引用本文： | 吴大转,杨帅,孙幼波,王乐勤,闵卫彬.多级副叶轮密封的性能分析与应用[J].排灌机械,2012(1):15-19,52. |
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| 作者姓名： | 吴大转 杨帅 孙幼波 王乐勤 闵卫彬 |
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| 作者单位： | [1]浙江大学化工机械研究所,浙江杭州310027 [2]亚星泵业制造有限公司,江苏靖江214531 |
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| 基金项目： | 国家科技支撑计划项目（2011BAF09B05） |
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| 摘 要： | 为了分析低功耗的副叶轮密封结构并将其应用在立式自吸泵上,采用CFD数值模拟方法对副叶轮功耗和封压能力的主要影响因素进行了分析.建立了基于叶片形式、叶片数量、阻旋片、径向间距以及平衡出口位置的多种数值模型,采用RNG k-ε湍流模式行定常数值模拟进行水力性能预测.预测分析的结果表明,采用后弯型叶片和提高叶片的个数可以增大副叶轮4.9%的封压能力,但是消耗功率增大40%,致使封压功率比降低;阻旋片的存在,可以消除叶轮背侧液体旋转,增大副叶轮5.7%的封压能力,但其宽度对副叶轮封压能力的提高影响不大;叶轮与壁之间的径向距离越小,副叶轮封压效果越好;平衡出口的存在可提高副叶轮3.5%的封压能力,但平衡出口的位置对副叶轮的封压效果具有较大影响.提出了两级副叶轮密封结构,分析了其功率消耗和封压性能.分析和工程应用的结果表明,采用后弯形叶片并配合阻旋片的多级副叶轮密封结构具有良好的密封性能,且功耗为单级结构功耗的55%左右.
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| 关 键 词： | 副叶轮 数值模拟 阻旋片 流体动力密封 自吸泵 |
Multistage auxiliary-impeller performance analysis and its application |
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| Wu Dazhuan,Yang Shuai,Sun Youbo,Wang Leqin,Min Weibin.Multistage auxiliary-impeller performance analysis and its application[J].Drainage and Irrigation Machinery,2012(1):15-19,52. |
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| Authors: | Wu Dazhuan Yang Shuai Sun Youbo Wang Leqin Min Weibin |
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| Institution: | 1. Institute of Chemical Machinery Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China; 2. Yaxing Pump Manufac turing Co. Ltd., Jingjiang, Jiangsu 214531, China) |
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| Abstract: | In order to analyze the structure of low-power consumption auxiliary-impeller and apply it to self-priming pumps,the main factors affecting power consumption and sealing pressure ability were analyzed by using CFD numerical simulation.A variety of numerical models were established based on blade type,number of blades,anti-rotation guide vanes,radial clearance and balance outlet locations.The k-ε turbulence model was adopted for steady flow simulation in predicting hydraulic performance.The obtained results showed that 4.9% more sealing pressure could be achieved when afterward-bent blades were used and the number of blades was increased.However,40% more power consumption was generated during the same process and therefore the sealing pressure power ratio was decreased.The anti-rotating vanes can eliminate the liquid rotation and improve the sealing ability 5.7% higher.The change of vanes′ width has little effect on further enhancing the ability of sealing pressure.With the decrease of the radial clearance between impeller and wall,sealing ability performs much better.The presence of balance outlet can improve the sealing effect 3.5% better.However,the location of balance outlet has a greater impact on the ability of sealing pressure.In the same time,two-stage auxiliary-impeller was put forward and was analyzed about power consumption and sealing ability.Analysis and engineering application results showed that the multi-stage auxiliary impeller with afterward-bent blades and fixed blades has a better sealing performance and the power consumption could be reduced to 55% of a single-stage structure. |
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| Keywords: | auxiliary-impeller numerical simulation anti-rotation guide vane fluid dynamic seals self-priming pump |
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