Numerical study of the jet-flow wake in the oblique flow impeller of a rear-mounted volute housing

A Fine/Turbo module of commercial software Numeca was used to conduct the whole-machine calculation for an oblique flow blower incorporating an oblique flow impeller and a volute housing as an integrated whole. Moreover, on the basis of having achieved a relatively good agreement with the already available test data, a detailed numerical analysis is performed of its inner flow field, which confirms that inside the oblique flow impellers, there also exist classic jet-flow wake patterns specific to a centrifugal impeller. The research results show that due to a highly nonsymmetrical nature of the volute housing, the jet flow-wake inside various impellers also features totally different patterns. A further study indicates that the basic reason leading to the emergence of this phenomenon lies in the presence of a nonsymmetrical volute housing, which changes the blade-tip leakage flow at the top of the impellers.