Velocity measurements have been taken in the vaneless diffuser of a centrifugal blower at steady flow conditions using miniature X-probes. The impeller speed of 1000 rpm was maintained constant at optimum operating flow coefficient of 0.373 to ensure that the diffuser is running at stall-free conditions. The flow angle measured (at half of the diffuser Width) did not exceed the value of 65°(this is well below the critical stall angle of 78° reported in the open literature).
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