An experimental investigation of unsteady separation shock wave motion in a plume-induced, separated flowfield

An experimental investigation of the unsteady separation shock wave motion in plume-induced, boundary layer separated (PIBLS) flowfields has been conducted. The PIBLS flowfields were created in a blowdown-type wind tunnel designed specifically to produce PIBLS in a planar, two-stream, supersonic flow. In this unique wind tunnel, separation of the freestream boundary layer upstream of the base plane was accomplished by utilizing an angle-induced separation geometry in the wind tunnel design in addition to operating the wind tunnel at jet-to-freestream static pressure ratios (JSPRs) greater than unity. In essence, the wind tunnel design consisted of a Mach 1.5 inner-jet flow angled at 40 degrees with respect to a Mach 2.5 freestream flow in the presence of a 0.5-inch thick base height. By throttling the stagnation pressure of the inner-jet flow, PIBLS flowfields, with nominal separation point locations ranging from two (JSPR $\approx$ 1.7) to six (JSPR $\approx$ 2.3) or more boundary layer thicknesses upstream of the base plane, were produced in the wind tunnel. The separation process associated with all of these PIBLS flowfields was observed by flow visualization techniques to be unsteady, and the separation shock wave that accompanied the separation process was found to exhibit large-scale (on the order of the incoming boundary layer thickness) motion in the streamwise direction.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Shaw, Russell Jay

Contributors dc:contributor

• Addy, A.L.

• Engineering, Aerospace
• Engineering, Mechanical

Statement dc:rights

• Copyright 1995 Shaw, Russell Jay

Language dc:language

eng

Identifier

AAI9624493
(UMI)AAI9624493

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/21122