Investigation of combustion phenomena associated with the flow of hot propellant gases. II. Gas velocity measurements by laser-induced gas breakdown

Journal Article · Fri Oct 01 00:00:00 EDT 1976 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(76)90021-3· OSTI ID:7133292

Klingenberg, G; Schroeder, G A

The local and temporal distribution of gas velocity along the axis of the propellant gas flow ahead of the muzzle of a caliber 7.62 mm rifle is determined by using luminous tracers produced by a laser pulse. Within the main expansion zone of the flow field, maximum gas velocities of 2400 m/s are observed. After passing through the shock front which terminates this expansion zone, the flow is decelerated to v < 150 m/s. Expansion starts anew at some distance from the shock front leading to gas velocities of several hundred m/s. This expansion is rapidly disturbed by the onset of secondary combustion causing a 'breakdown' of the flow. The effect is explained by the buildup of reverse pressure gradients between the shock front and the reaction zone.

• Research Organization: Arbeitsgruppe fuer Ballistische Forschung, Weil, Ger.
• OSTI ID: 7133292
• Journal Information: Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 27:2; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
&amp; High-Temperature Chemistry
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450100* -- Military Technology
Weaponry
&amp; National Defense-- Chemical Explosions &amp; Explosives
AMMUNITION
ANEMOMETERS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION CHAMBERS
COMBUSTION PROPERTIES
FLUID FLOW
GAS FLOW
GUNS
LASERS
MEASURING INSTRUMENTS
OXIDATION
PROPELLANTS
VELOCITY