Accession Number:

AD0758803

Title:

Time-Dependent Subsonic Diffuser Analysis.

Descriptive Note:

Technical rept. 1 Oct 71-31 Jul 72,

Corporate Author:

ADVANCED TECHNOLOGY LABS INC JERICHO N Y

Personal Author(s):

Report Date:

1972-12-01

Pagination or Media Count:

74.0

Abstract:

A mathematical model of the time-dependent flow in the subsonic diffuser section of an external compression, supersonic inlet is described. The flow is divided, in standard fashion, into inviscid and boundary layer components. The inviscid flow is assumed to be two dimensional i.e., axisymmetric as well as time-dependent, and the region considered extends from the inlet terminal shock to the engine face. A finite-difference technique for solution of the inviscid flow is developed utilizing a moving, polar coordinate system attached to the shock for the exterior flow field and a fixed, rectilinear system for the interior flow field. The boundary conditions consist of the inlet flow conditions upstream of the terminal shock and the pressure distribution at the engine face either a steady, transient or periodic solution can be sought depending on the imposed boundary conditions. Both laminar and turbulent boundary layers have been considered. Author Modified Abstract

Subject Categories:

  • Fluid Mechanics
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE