Performance of Conical Diffusers With Annular Injection at Inlet

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Abstract
Data on the gross performance of conical diffusers subjected to annular secondary injection at inlet are reported. Tests indicate that the improvement in diffuser performance is significant even at moderate rates of injection. The effects of injection rate and diffuser geometry on the pressure recovery and stall are discussed. An analytical method based on the solution of the boundary layer equations by the Patankar-Spalding finite difference method has been used to obtain predictions of pressure recovery with inlet injection. The predictions compare well with the experimental results.

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