Study And Improvement On Aerodynamic Performance Of A Centrifugal Blower Impeller

Centrifugal blower is widely used in lots of field such as chemical industry, steel and environmental protection, it has the advantages of high pressure ratio and compact structure. In the recent year, with the gradual increasing requirement of energy saving and emission reduction for enterprise and continuously driving of economic benefit, the development of high efficiency centrifugal blower and the performanceimprovement of old production has received widely attention by the industry.In this article, a centrifugal blower impeller which is widely used in sewage treatment plant was studied numerically to obtain the performance and the flow field. The results showed that a large area of low energy flow existed in front of blade passage near shroud which was caused by shock wave and secondary flow. Design 3D module of commercial software, NUMECA, was used to optimize the low energy flow and then improve the performance.The efficiency of impeller at design point had no improvement despite the area of low energy flow decreasing. So the improvement of efficiency is limited when meridional channel is unchanged. To increase the efficiency of impeller further, inverse design software TD1 in which the input parameter is blade loading was used to redesign the impeller, the meridional channel was changed at the same time. The effect of various types of blade loading distribution towards efficiency, operation range, flow field and secondary flow loss was studied in the design work. Impeller with fore-loaded at shroud and aft-loaded at hub had the optimum efficiency among various results.This article had summarized a set of aerodynamic design and optimization methods for centrifugal impeller through the three aspects of research work above.The method can satisfy requirement of enterprise and can be easily mastered by engineering designers, consequently designers can design or optimize centrifugal blower impeller rapidly and offer guidelines for enterprise to optimize efficiency of blower, reduce cost of development and design cycle.