Accession Number:

ADA048896

Title:

Flow Characteristics in a Two-Dimensional Multiple-Nozzle Multiple-Diffuser Assembly.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1977-12-01

Pagination or Media Count:

62.0

Abstract:

Pressure measurements and schlieren photographs were used to study the flow characteristics in a two-dimensional multiple-nozzle multiple-diffuser assembly. The assembly consisted of 29 full nozzles with a half nozzle at each end of the array. The contoured nozzles were designed for an ideal Mach number of 3.23. Fourteen axial diffuser vanes provided 15 diffuser passages. Flow characteristics were studied at five positions of the diffuser entrance plane with respect to the nozzle exit plane. Air at 80F and a maximum of 118 psig was passed through the nozzles into a constant area region then through the diffusers to ambient conditions. The test cavity start and unstart pressures decreased as the diffuser entrance plane approached the nozzle exit plane. A diffuser leading edge in the immediate vicinity of a major alternate nozzle trailing edge shock intersection resulted in a flow instability during cavity start. This instability resulted in a subsonic wake in the test cavity after cavity start. Author

Subject Categories:

  • Lasers and Masers
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE