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低比轉(zhuǎn)數(shù)離心泵葉輪內(nèi)能量轉(zhuǎn)換特性
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江蘇省科技服務(wù)業(yè)發(fā)展計劃資助項目(BM2008375)和江蘇大學(xué)博士創(chuàng)新計劃資助項目(CX10B_004X)


Energy Conversion Characteristic within Impeller of Low Specific Speed Centrifugal Pump
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    摘要:

    對比轉(zhuǎn)數(shù)為60的離心泵內(nèi)部流場進(jìn)行數(shù)值模擬計算，從葉輪做功過程和能量損失過程兩方面分析了葉輪內(nèi)能量轉(zhuǎn)換特性。將葉輪按徑向尺寸分為8個區(qū)域，展示了不同工況、不同區(qū)域中壓力和粘性力做功大小、功率密度分布、湍動能耗散率分布、能量損失組成及分布等能量轉(zhuǎn)換相關(guān)特征。結(jié)果表明，葉輪進(jìn)口區(qū)域能量轉(zhuǎn)換效率相對較低且受葉片進(jìn)口安放角影響，葉輪中部區(qū)域是葉輪做功和流體獲得能量的關(guān)鍵區(qū)域，葉輪出口區(qū)域?qū)θ~輪性能有顯著影響，壁面摩擦損失是葉輪內(nèi)能量損失的主要組成部分。

    Abstract:

    The flow field of a centrifugal pump with the specific speed of 60 was computed by CFD method, and the analysis was made to the characteristics of energy conversion within impeller from aspects of working process and energy loss process. The impeller was divided into 8 regions by the radius. Under different operating conditions, characteristics in each region were demonstrated the power of pressure and viscous force, distribution of power density and turbulence dissipation rate, composition and distribution of the energy loss. The results indicated that efficiency was poor and it was influenced by the inlet blade angle in inlet region of the impeller, the middle region of impeller was important to the energy conversion, the outlet region of impeller had appreciable impact on the performance, and fiction loss was the main component of the energy loss.

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張翔,王洋,徐小敏,王洪玉.低比轉(zhuǎn)數(shù)離心泵葉輪內(nèi)能量轉(zhuǎn)換特性[J].農(nóng)業(yè)機械學(xué)報,2011,42(7):75-81. Zhang Xiang, Wang Yang, Xu Xiaomin, Wang Hongyu. Energy Conversion Characteristic within Impeller of Low Specific Speed Centrifugal Pump[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(7):75-81.

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