CONTROL OF FLOW SEPARATION IN SUPERSONIC NOZZLES BY MEANS OF BOUNDARY-LAYER INJECTION

Technical Report · Tue Dec 31 04:00:00 EST 1957

OSTI ID:4339375

Green, L Jr; Nall, K L

A review of previous investigations of flow separation in supersonic de Laval nozzles indicated a need for experimental data on the effect of the nozzle heat-transfer condition on jet-detachment behavior, and on the feasibility of controlling the point of separation of an overexpanded flow by fluid injection through a porous boundary. An experiment was designed to obtain the desired information by means of pressure-distribution measurements and schlieren observation. Owing to delays in the delivery of quartz nozzle-wall windows of the optical quality required for schlieren photography of high-stagnation- temperature flow patterns, the present investigation was limited to studies in which dry nitrogen was expanded from ambient temperatures. It was found that under these conditions the boundary-injection technique was indeed effective in promoting controlled separation at expansion ratios approaching the optimum value. (auth)

• Research Organization: Aerojet-General Corp., Azusa, Calif.
• NSA Number: NSA-12-004149
• OSTI ID: 4339375
• Report Number(s): AGC-1381
• Country of Publication: United States
• Language: English

Related Subjects

ENGINEERING
EXPANSION
FLUID FLOW
HEAT TRANSFER
INJECTION
JETS
LAYERS
MEASURED VALUES
NOZZLES
OPTICAL SYSTEMS
PHOTOGRAPHY
POROSITY
PRESSURE
QUARTZ
ULTRASONICS
WINDOWS