High-speed schlieren analysis of buzz in a relaxed-compression supersonic inlet

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The buzz cycle of a supersonic axisymmetric relaxed external compression inlet has been investigated in the 8'x6' supersonic wind tunnel at NASA Glenn Research Center. This inlet entails a mechanically simple design for providing a high-recovery/low-distortion flowfield and low sonic boom signature. Inlet buzz occurred at low mass-flow ratios with various vortex-generator configurations and Mach number values, providing an abundance of buzz data. High-speed schlieren and pressure measurements were used to characterize the inlet buzz. Schlieren movies not only allowed the characterization of the buzz cycle but also permitted the shock position to be tracked in time so that the frequency of the shock motion could be evaluated. The analysis revealed a dominant low frequency oscillation at 21.0 Hz corresponding with the duration of one buzz cycle. High-frequency shock position oscillations (spike buzz) were also observed throughout portions of the inlet buzz cycle.

Original languageEnglish (US)
Title of host publication48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2012
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781600869358
DOIs
StatePublished - 2012
Event48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2012 - Atlanta, GA, United States
Duration: Jul 30 2012Aug 1 2012

Publication series

Name48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2012

Other

Other48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2012
CountryUnited States
CityAtlanta, GA
Period7/30/128/1/12

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Aerospace Engineering
  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering

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