이차흐름에 의한 스팬방향의 믹싱효과와 선단틈새흐름을 고려한 준 삼차원 사류송풍기 내부흐름 해석

Internal Flow Analyses of Diagonal Type Blowers Using a Quasi-3-Dimensional Method Considering Spanwise Mixing and Tip Clearance Effect Due to Secondary Flows

This paper presents a quasi-3-dimensional calculation method considering secondary flows in the impellers of diagonal flow blowers. A Quantitative estimation of the secondary flow effects is made by using secondary flow theories. In order to verify the validity of the adopted models, that is, span-wise mixing model and the tip clearance model, numerical simulations are performed for two different types of impellers of diagonal flow blowers which are designed differently. Numerical experiments are conducted for each of a constant tangential velocity type impeller, and a free vortex type impeller, both at two different flow coefficients. According to the simulation results, it was found that the present model considering span-wise mixing and tip clearance effect shows better agreements with the experimental data than those without these models in terms of the flow velocity and the angle distribution.