Accession Number:

AD0292179

Title:

AN INVESTIGATION OF THE EFFECTS OF INJECTING AIR THROUGH ONE WALL OF AN OVEREXPANDED, TWO-DIMENSIONAL NOZZLE

Descriptive Note:

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1962-08-01

Pagination or Media Count:

1.0

Abstract:

Premature separation was studied of the flow of an overexpanded supersonic exhaust nozzle when caused by the injection of gas through the divergent wall. The nozzles were formed by placing contoured blocks between two glass plates. Cold air at 190 in. Hg. abs. was used for the main and injected streams. The flow was visually studied with a Schlieren apparatus and a survey of static pr ssures was made along the surface of each block. Premature separation occurred with an oblique shock attached to the wall slightly ahead of the location of injection. The rate of injection required is a minimum when the injection is directed counter to the main stream. The rate can be further reduced if the injection is spread over an area of the wall immediately ahead of the overexpanded separation point. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE