基于动量定理的气举提升系统建模与分析  

Modeling and analysis of airlift pumping system based on momentum theorem

作　　者：胡东[1] 唐川林[1] 廖振方[2] 

机构地区：[1]湖南工业大学机械工程学院,湖南株洲412008 [2]重庆大学机械工程学院,重庆401331

出　　处：《排灌机械工程学报》2012年第5期592-597,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：科技部国际科技合作项目(2008DFA70300);湖南工业大学自然科学研究项目(2011HZX10)

摘　　要：为了寻求气举提升系统理论建模的新方法,基于动量定理构建气举管内混合流体控制方程,应用线性化处理手段并结合理论分析及相关经验公式,数值计算得出气、液和固体体积通量三者的函数关系.为了试验验证理论模型的可靠性,选用中等粒径普通河沙为测试颗粒,建立室内扬沙系统,得出了排液量、排沙量随气量值的变化规律,并与理论值进行对比.结果表明:影响该模型的因素较为复杂,但其计算结果由于采用线性化处理手段而较易实现.该模型对排液量的预测精度较高,其相对误差大部控制在8%以内,而对排沙量的预测精度较前者稍低.当只对气-液两相输送时,其理论模型预测精度更高,其相对误差基本在6%以内.另外,对应中等气量范围内,理论值与实测值吻合较好,而对应其他工况下两者吻合程度有所下降,且在峰值处吻合程度最差.研究成果为更好地理解和优化气举各参数提供重要的参考.In order to look for a new method to establish theoretical models for airlift pumping systems,the mixture flow governing equations were constructed for an airlift pump based on the momentum theory,and the relations among the volumetric fluxes of air,water and solid were obtained numerically by using linearization approach,theoretical analysis and empirical formulas.A river sand airlift pumping system was built in laboratory,and ordinary river sands of medium size were selected as test solid particles to investigate the reliability of the model.The relations between volumetric fluxes of both water and solid and that of air were obtained experimentally and were compared with that evaluated by the theoretical model.It showed that many complicated factors had effect on the model,and therefore it had to be linearized to make the flow parameters prediction easier.The model exhibited a good accuracy for water volumetric flux prediction and the relative errors were almost less than 8%,while slightly poor for solid volumetric flux prediction.Moreover,the model presented more accurately for air / water two phase pumping system and the relative errors were less than 6%.In addition,the theoretical eva-luation matched well with the experimental observation at moderate air volumetric flux,while showed slightly poor under other conditions especially at its peak values.The results can provide an important reference for understanding and optimizing various parameters of airlift pumping systems.

关 键 词：气举 动量定理 混合流体 体积通量 相对误差 

分 类 号：S277.9[农业科学—农业水土工程] TD432[农业科学—农业工程]