Loughborough University
Download file
Download file
2 files

The influence of inlet conditions on the boundary layer growth and overall performance of annular diffusers

posted on 2018-10-18, 10:32 authored by G.J. Williams
An experimental investigation of the flow behaviour in, and overall performance of, the straight-core annular diffuser under naturally and artificially generated inflow conditions is described. For naturally developed near uniform inflow diffuser overall performance, and stability limits, are theoretically predicted. In the first part of the research program the diffusers were tested over a range of naturally developed inflow velocity profiles from near-uniform to fully developed flow. The diffuser pressure recovery was observed to fall with initial thickening of the inlet boundary layers and subsequently improved as the flow became fully developed. Downstream of the diffuser exit pressure recovery continued for some two hydraulic diameters into the settling length. The measured levels of diffuser performance compared well with relevant published data but similar stability limits were not found. This was attributed to the varying inflow conditions for the published data. [Continues.]


Loughborough University of Technology. Science Research Council.



  • Aeronautical, Automotive, Chemical and Materials Engineering


  • Aeronautical and Automotive Engineering


© G.J. Williams

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date



A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.


  • en

Usage metrics

    Aeronautical and Automotive Engineering Theses