Wall pressure fluctuations in the reattachment region of a supersonic free shear layer

Shen Zhen-Hua, Douglas R. Smith, Alexander J. Smits

Research output: Contribution to conferencePaper

Abstract

Wall pressure fluctuations have been measured in the reattachment region of a supersonic free shear layer. The free shear layer was formed by the separation of a Mach 2.9 turbulent boundary layer from a backward facing step. Reattachment occurred on a 20° ramp. By adjusting the position of the ramp, the base pressure was set equal to the free stream pressure, and the free shear layer formed in the absence of a separation shock. An array of flush-mounted, miniature, high-frequency pressure transducers was used to make multichannel measurements of the fluctuating wall pressure in the vicinity of the reattachment region. Contrary to previous observations of this flow, the reattachment region was found to be highly unsteady, and the pressure fluctuations were found to be significant. The overall behavior of the wall pressure loading is similar in scale and magnitude to the unsteadiness of the wall pressure field in compression ramp flows at the same Mach number. Rayleigh scattering was used to visualize the instantaneous shock structure in the streamwise and spanwlse direction. Spanwise “wrinkles” on the order of half the boundary layer thickness were observed.

Original languageEnglish (US)
StatePublished - Jan 1 1990
EventAIAA 21st Fluid Dynamics, Plasma Dynamics and Lasers Conference, 1990 - Seattle, United States
Duration: Jun 18 1990Jun 20 1990

Other

OtherAIAA 21st Fluid Dynamics, Plasma Dynamics and Lasers Conference, 1990
CountryUnited States
CitySeattle
Period6/18/906/20/90

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Engineering (miscellaneous)

Fingerprint Dive into the research topics of 'Wall pressure fluctuations in the reattachment region of a supersonic free shear layer'. Together they form a unique fingerprint.

  • Cite this

    Zhen-Hua, S., Smith, D. R., & Smits, A. J. (1990). Wall pressure fluctuations in the reattachment region of a supersonic free shear layer. Paper presented at AIAA 21st Fluid Dynamics, Plasma Dynamics and Lasers Conference, 1990, Seattle, United States.