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農(nóng)產(chǎn)品物料高速切割粉碎流場數(shù)值模擬與試驗(yàn)
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of Fluid Field for High-speed Cutting Grinding
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    摘要:

    在分析高速切割粉碎機(jī)工作原理的基礎(chǔ)上，基于CFD技術(shù)，應(yīng)用Fluent軟件及RNG k-ε湍流模型對粉碎過程進(jìn)行流場數(shù)值模擬，分析了粉碎室內(nèi)部流場的壓力與速度分布，研究了葉輪葉片形狀、刀片偏角、葉輪轉(zhuǎn)速對流場的影響，并對切割粉碎區(qū)內(nèi)物料的壓力、運(yùn)動速度、剪切應(yīng)變率等性能參數(shù)進(jìn)行分析，得出轉(zhuǎn)子為直葉片式葉輪，刀片的偏轉(zhuǎn)角度為2°時產(chǎn)生的切割粉碎流場最有利于切割粉碎，葉輪轉(zhuǎn)速對各性能參數(shù)的影響呈線性關(guān)系。對不同特性物料的試驗(yàn)表明，該高速切割粉碎機(jī)物性適應(yīng)性強(qiáng)、粉碎效果好。

    Abstract:

    Based on the analysis of high-speed cutting principle, the numerical simulation of a flow field within the crushing chamber in pulverizing process was performed by CFD technique, and Fluent software, in which RNG k-ε turbulence model was adopted. The effects of impeller blade shape, blade angle and impeller speed on the flow field were revealed, and the crush velocity, pressure, and shear strain rate were analyzed. The linear relationships between the impeller speed and various parameters were obtained. In case of straight blade impeller with 2° deflection angle the obtained flow field shows the optimal efficiency for cutting crush. The experiments for various materials indicate that the high-speed cutting grinder has the broad prospects with physical adaptability and smashing effect.

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沈培玉,趙浩,張?jiān)Ｖ?農(nóng)產(chǎn)品物料高速切割粉碎流場數(shù)值模擬與試驗(yàn)[J].農(nóng)業(yè)機(jī)械學(xué)報,2010,41(9):60-65. of Fluid Field for High-speed Cutting Grinding[J]. Transactions of the Chinese Society for Agricultural Machinery,2010,41(9):60-65.

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