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柴油機(jī)噴嘴內(nèi)空穴流動可視化試驗(yàn)與數(shù)值模擬
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國家自然科學(xué)基金資助項(xiàng)目（50806030）


Visualization Experiment and Numerical Simulation for Cavitating Flow in a Diesel Injector Nozzle
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    摘要:

    柴油機(jī)噴霧特性除了與氣缸內(nèi)氣流運(yùn)動有關(guān)外，也與噴嘴內(nèi)空穴流動有密切的關(guān)系。設(shè)計了比例放大多孔噴嘴內(nèi)空穴流動和噴霧的可視化試驗(yàn)裝置，進(jìn)行了不同燃油噴射壓力下噴嘴內(nèi)空穴現(xiàn)象和噴霧的可視化試驗(yàn)，對所建噴嘴內(nèi)空穴流動的三維數(shù)值計算模型進(jìn)行了試驗(yàn)驗(yàn)證。采用試驗(yàn)和數(shù)值模擬相結(jié)合的方法分析了噴嘴內(nèi)部流動從單相湍流流動發(fā)展為空穴流動、超空穴流動的流動特性，得出了噴嘴流量系數(shù)與噴射壓力及空穴參數(shù)之間的關(guān)系以及噴嘴內(nèi)出現(xiàn)空穴現(xiàn)象的臨界條件。

    Abstract:

    A visualization unit with a proportion of the multi-hole injector nozzle for cavitating flow was developed, and by means of high-speed video camera, the pictures of the cavitating flow in a large-scale transparent nozzle were taken under various injection pressures. A three-dimensional grid model of the injector nozzles was established, and the three-dimensional numerical simulation of cavitating flow in nozzle holes of a multi-hole injector combined with these pictures from experiment was utilized to analyze flow characteristics of single-phase flow to supercavitation flow. The relationship between injection pressure, non-dimensional cavitation parameters and the discharge coefficient, as well as the critical conditions when the cavitation appeared was pointed out clearly.

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何志霞,柏金,王謙,黃云龍.柴油機(jī)噴嘴內(nèi)空穴流動可視化試驗(yàn)與數(shù)值模擬[J].農(nóng)業(yè)機(jī)械學(xué)報,2011,42(11):6-9,5. He Zhixia, Bai Jin, Wang Qian, Huang Yunlong. Visualization Experiment and Numerical Simulation for Cavitating Flow in a Diesel Injector Nozzle[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(11):6-9,5.

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