A study on the rotating stall in vaneless diffusers of centrifugal fans. (4th report. Effect of impellers).

TL;DRAbstract

This paper describes the effect of impellers on a critical inlet flow angle for the onset of a diffuser rotating stall and on rotational speeds of stall cells. The experiment has been carried out using four specially designed impellers and a diffuser. The main results in this experiment are as follows : The critical inlet flow angle is independent of impellers and the predicting equation of that in the first report is useful for all impellers. The critical inlet flow angle is constant for all rotational speeds of the impeller. The onset of the rotating stall is independent of flow velocity at the diffuser inlet. The experimental equations of rotational speeds of cells are useful for all impellers. A predicting method of a critical discharge coefficient for the onset of the rotating stall is presented in this paper. The method is accurate enough for practical usage.

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