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葉片式混輸泵氣液兩相非定常流動特性分析
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國家自然科學(xué)基金資助項目(51009003);水沙科學(xué)與水利水電工程國家重點實驗室開放研究基金資助項目(SKLHSE—2013—E—01


Characteristic Analysis of Unsteady Gas-liquid Two-phase Flow in a Multiphase Rotodynamic Pump
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    摘要:

    基于細泡狀流動假設(shè),,采用雙流體模型對一葉片式混輸泵葉輪內(nèi)的氣液兩相流動進行定常和非定常數(shù)值模擬,。計算中,,進口含氣率為15%,,湍流模型采用基于k—ω模型的SST模型,,相間作用力考慮了阻力和附加質(zhì)量力,。通過分析流域的含氣率及兩相速度矢量分布,,探討了混輸泵內(nèi)氣液兩相非定常流動特性,。結(jié)果顯示,混輸泵葉輪內(nèi)的兩相輸運過程出現(xiàn)“不連續(xù)氣團運動”現(xiàn)象,。該現(xiàn)象的形成與氣泡尺寸及氣體所受的相間作用力有關(guān),,并且只有在非定常計算中才能得到清晰展現(xiàn)。計算還發(fā)現(xiàn),,氣相軸面渦的位置與高含氣率區(qū)幾乎完全對應(yīng),,說明氣相旋渦是造成氣體局部聚集的主要因素之一。通過對比外特性計算和實驗結(jié)果,,驗證了所用數(shù)值模型和方法的可靠性,。

    Abstract:

    Based on the assumption of tiny bubbly flow, the gas-liquid two-phase flow in a multiphase rotodynamic pump was numerically simulated with two-fluid model in both steady and unsteady modes. In the simulation, the inlet gas volume fraction was 15%. The k—ωbased SST model was used for turbulence. The drag force and the added mass force were accounted for in the interfacial momentum transfer terms. Through the analyses of the distribution of gas volume fraction and velocity vectors, the unsteady flow characteristic in the multiphase pump was explored. The results demonstrated that a phenomenon named “discontinuous air mass movement” would occur in the two-phase transport process. The formation of this phenomenon was related to the bubble size and the interfacial forces acting on the gas, and only in unsteady simulation could this phenomenon be observed. Also, it was found that the locations of gas vortexes in meridional plane were almost fully corresponding to the regions of high gas volume fraction, which illustrated that gas vortex was one of the main factors that led to gas accumulation. In addition, through comparison of the external characteristics between the simulation and the experiment, the reliability of the numerical method was validated.

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余志毅,劉影.葉片式混輸泵氣液兩相非定常流動特性分析[J].農(nóng)業(yè)機械學(xué)報,2013,44(5):66-69,95. Yu Zhiyi, Liu Ying. Characteristic Analysis of Unsteady Gas-liquid Two-phase Flow in a Multiphase Rotodynamic Pump[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(5):66-69,,95.

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  • 在線發(fā)布日期: 2013-04-28
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