叶轮结构对渣浆泵性能影响的数值与试验分析

Numerical and Experimental Analysis of the Influence of Impeller Structure on Slurry Pumps Performance

作为输送煤炭的重要设备,渣浆泵在煤矿、燃煤电厂等化石能源领域得到了广泛应用,渣浆泵性能的提高可以有效降低化石能源行业的能源损耗。提出了一种具有分流叶片结构的新型叶轮,对不同叶轮结构的渣浆泵内部流场展开了分析;根据渣浆泵内旋涡的形状和结构,运用Q准则将旋涡分为前缘旋涡、后缘旋涡和间隙泄漏涡,剖析了各旋涡的产生机理及旋涡强度与流动状态的关系;利用熵产理论研究了渣浆泵的能量损失,并探讨了不同叶轮结构在两相流工况下的压力分布。结果表明,采用分流叶片可以降低渣浆泵因熵产造成的能量损失,抑制叶轮出口处的流动分离。

As an important equipment for transporting coal,slurry pumps are widely used in fossil energy fields such as coal mines and coal-fired power plants,improving the performance of slurry pumps can effectively reduce energy losses in the fossil energy industry.A new type of impeller with a splitter blade structure was proposed,and the internal flow field of slurry pumps with different impeller structures was analyzed.Based on the shape and structure of the vortex inside the slurry pump,the vortex is divided into leading edge vortex,trailing edge vortex,and gap leakage vortex using the Q criterion.The generation mechanism of each vortex and the relationship between vortex strength and flow state are analyzed.The energy loss of slurry pump was studied using entropy production theory,and the pressure distribution of different impeller structures under two-phase flow conditions was discussed.The results indicate that the use of splitter blades can reduce the energy loss caused by entropy production in the slurry pump and suppress flow separation at the impeller outlet.