National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Expansion of a Jet into Near Vacuum.

AD469041

Publication Date	1965
Personal Author	Cassanova, R. A.; Stephenson, W. B.
Page Count	99
Abstract	The flow field of nozzles exhausting into a vacuum was investigated both analytically and experimentally. The applicability of the method of characteristics for jet expansions into a free molecular environment is discussed. Fifteen-degree, half-angle, conical nozzles with area ratios of 1.0 to 207 were tested with argon and nitrogen at total pressures of 100, 50, and 35 psia. Ambient pressures of .0001 to .000001 torr yielded total pressure to ambient pressure ratios of 10,000,000 to 10 to the 9th power. Properties of the flow field were determined by the use of flat plates and flow direction vanes. (Author)
Keywords	Jets Exhaust gases Nozzle gas flow Gas flow Vacuum Superaerodynamics Argon Nitrogen Pressure
NTIS Subject Category	51A - Aerodynamics
Corporate Authors	Arnold Engineering Development Center, Arnold Air Force Station, Tenn.
Supplemental Notes	Prepared in cooperation with ARO, Inc., Arnold Air Force Station, Tenn.
Document Type	Technical Report
Title Note	Technical rept.
NTIS Issue Number	196401
Contract Number	AF40(600)-1000

Expansion of a Jet into Near Vacuum.

Expansion of a Jet into Near Vacuum.
AD469041

Publication Date	1965
Personal Author	Cassanova, R. A.; Stephenson, W. B.
Page Count	99
Abstract	The flow field of nozzles exhausting into a vacuum was investigated both analytically and experimentally. The applicability of the method of characteristics for jet expansions into a free molecular environment is discussed. Fifteen-degree, half-angle, conical nozzles with area ratios of 1.0 to 207 were tested with argon and nitrogen at total pressures of 100, 50, and 35 psia. Ambient pressures of .0001 to .000001 torr yielded total pressure to ambient pressure ratios of 10,000,000 to 10 to the 9th power. Properties of the flow field were determined by the use of flat plates and flow direction vanes. (Author)
Keywords	Jets Exhaust gases Nozzle gas flow Gas flow Vacuum Superaerodynamics Argon Nitrogen Pressure
NTIS Subject Category	51A - Aerodynamics
Corporate Authors	Arnold Engineering Development Center, Arnold Air Force Station, Tenn.
Supplemental Notes	Prepared in cooperation with ARO, Inc., Arnold Air Force Station, Tenn.
Document Type	Technical Report
Title Note	Technical rept.
NTIS Issue Number	196401
Contract Number	AF40(600)-1000