考虑轮盖结构及间隙的风机优化设计

风机是传统行业的主要耗能原件.对风机进行优化设计,提升风机的静压效率对于节能环保具有重要的意义.迄今为止风机的优化设计更多聚焦叶轮结构,对于轮盖结构及间隙对风机性能影响的研究却很少.为提高一款工业离心式风机气动性能,通过实验和数值模拟的方法研究了轮盖结构与间隙以及前安装角对风机性能的影响,并对其进行了优化设计.首先,对...

Optimal design of fan considering wheel cover structure and clearance

Fans are the main energy-consuming components in traditional industries. Optimizing the design of the fan and improving the static pressure efficiency of the fan are of great significance for energy conservation and environmental protection. So far, the optimized design of fans has focused more on the impeller structure, and there are few studies on the influence of the structure of the wheel cover and the gap on the performance of the fan. In order to improve the aerodynamic performance of an industrial centrifugal fan, The experimental and numerical simulation methods are used to investigate the influence of the structure and clearance of the wheel cover and the front installation Angle on the performance of the fan, and to optimize the design.First, the fan was tested to obtain the performance parameters of the fan, and the influence of the structure of the upper cover plate of the fan on the performance of the fan was studied. It was found that the flat upper cover plate can reduce local losses and improve the efficiency; Parameter sensitivity test, according to the calculation results, found that changing the front installation angle of the impeller blade and the gap between the impeller and the volute have different effects on the aerodynamic performance of the fan, and then the structure of the fan is improved. The results show that the aerodynamic performance of the improved fan is significantly improved, and the static pressure efficiency is increased by 3% overall. It is concluded that the structure of the upper cover of the volute of the centrifugal fan is not reasonable enough, and the fan with improved volute structure can effectively reduce the secondary flow loss caused by the uneven volute, and the improvement of the gap between the fan volute and the impeller can effectively alleviate the internal leakage of the fan. Due to the energy loss, improving the front installation angle of the impeller blade can reduce the deviation between the installation angle and the airflow angle due to the increase in the flow at the bottom of the impeller due to internal leakage.