Purpose and Scope of this Data Item This Data Item enables static pressure recovery to be predicted and total-pressure loss and flow pattern* estimated for subsonic compressible flow through straight-axis conical diffusers (right cones). The effects of various geometrical and flow parameters on diffuser performance are discussed. By selection of a geometry it enables a subsonic diffuser of required performance to be designed or@ alternatively@ enables the performance of a diffuser of specified geometry to be assessed. Performance is considered primarily in terms of static pressure rise for a range of entry mean Mach numbers@ 0.2??1??.8@ and a range of entry duct lengths@ 0??u ?D1 ??6. Other influences such as Reynolds number@ velocity profile shape@ turbulence level@ shock-wave/boundary layer interaction upstream of the diffuser and the approach to choking are considered as a guide to understanding the behaviour and performance of such diffusers and as an aid to design or performance assessment. Guidance on the estimation of total-pressure loss from static pressure rise is given. * Flow pattern refers to flow regime and velocity profile.
ESDU 90025-1990 history
1990ESDU 90025-1990 PERFORMANCE OF CONICAL DIFFUSERS IN SUBSONIC COMPRESSIBLE FLOW