Tests have been conducted on a Conical Hybrid Diffuser of short length in order to determine the effects of a range of inlet flow distortions of an axisymmetric nature.

As with most other types of diffuser, the performance was impaired as the level of distortion was increased, although some restoration could be obtained by either increasing diffuser length or rate of bleed-off.

In general, diffuser performance, in terms of flow stability and pressure recovery, was satisfactory.

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