抛雪风机的气固两相流场数值分析与结构优化

Numerical Analysis and Structural Optimization of Gas-solid Two-phase Flow Field for Snow Blower

为探究抛雪风机在抛雪作业过程中内部流场的流动特性,揭示流场作用下雪的速度和浓度分布情况,优化风机结构,改善风机的抛雪性能,以自主研制的公铁两用除雪车为基础,利用CFD方法,建立了风机内部流场的气固两相流数值模型,对风机抛雪过程进行仿真研究。同时,对风机机壳形状、风扇叶片数以及叶片安装倾角等机构参数对气固两相流场和抛雪的影响进行了模拟分析与对比研究。结果表明:适当的机壳形状有利于改善流场的流动状况,提高抛雪能力;当风扇叶片安装倾角为0°、叶片数目为4时,风机内部流场流动情况更有利于积雪的抛送和减少能量的损耗。

This study aimed to explore the flow characteristics of the internal flow field during the snow throwing operation of the snow blower,reveal the speed and concentration distribution of the snow under the effect of the flow field,optimize the structure of the fan,and improve the snow throwing performance of the fan.Based on the independently developed dual-purpose snow removal vehicle,a numerical model of the gas-solid two-phase flow in the fan’s internal flow field was established using the CFD method,and the fan snow throwing process was simulated.At the same time,the effects of the fan casing shape,the number of fan blades and the blade installation inclination on the gas-solid twophase flow field and the snow throwing were simulated and compared.The results show that the appropriate casing shape is beneficial to improving the flow.The flow conditions of the field improve the ability to throw snow;when the fan blades are installed with an inclination of 0 degree and the number of blades is 4,the flow field inside the fan is more conducive to snow throwing and energy loss reduction.