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针对某型号扫路车存在快速作业时吸拾效率低的问题,以扫路车气力系统中主要承担吸拾和输运砂尘作用的吸嘴为研究对象,进行三维数值仿真分析和试验研究。利用Flue nt并采用RNGκ-ε湍流模型结合DP M模型进行数值计算。基于对原始吸嘴内部流场的分析,对吸嘴结构进行改进,去除原吸嘴前方的塑料胶皮挡板,改为V形结构,使吸嘴前方的气流由前后方向变为从多个方向进入吸嘴内部。对比分析原吸嘴结构和改进结构在额定作业工况下的流场特征并进行试验验证,结果表明,改进后的吸嘴结构内部可产生更大更强的漩涡结构,增强了吸嘴对砂粒的吸拾能力,有效提高了吸嘴的吸拾效率。
Aiming at the problem of low pick-up efficiency when a certain type of road sweeper has fast operation, the three-dimensional numerical simulation analysis and experimental research are carried out on the suction mouth which is mainly responsible for absorbing and transporting dust and sand in the sweeping road pneumatic system. Flue nt was used and the RNG κ-ε turbulence model combined with the DP M model was used for numerical calculation. Based on the analysis of the internal flow field of the original nozzle, the structure of the nozzle is improved, the plastic rubber baffle in front of the original nozzle is removed and the V-shaped structure is changed to change the air flow in front of the nozzle from front to back direction from multiple directions Into the nozzle inside. The characteristics of the flow field of the original suction nozzle structure and the improved structure under the rated working conditions are compared and verified. The results show that the improved nozzle structure can produce a bigger and stronger vortex structure, The pickup capacity, effectively improve the pick-up pick-up efficiency.