Accession Number : AD0646319

Title :   AN ANALYTICAL APPROACH TO THE TURBULENT MIXING OF COAXIAL JETS,

Corporate Author : NAVAL ORDNANCE TEST STATION CHINA LAKE CALIF

Personal Author(s) : Victor,Andrew C. ; Buecher,Roger W.

Report Date : OCT 1966

Pagination or Media Count : 39

Abstract : The turbulent mixing of coaxial jets is a critical phenomenon in areas such as air-augmented rocket propulsion and radar attenuation by rocket exhausts. In the report a model is developed which approximates the mixing of coaxial jets assuming equal pressures in the two flows. Provision is made for chemical reaction and heat release in the mixing region. The model is based on the theory developed by Libby and assumes that turbulent mixing can be described by the equations for laminar flow, if the laminar transport coefficients are replaced by their turbulent counterparts. The model is demonstrated for an afterburning rocket exhaust, and contours of velocity and temperature in the plume are constructed. Accurate predictions of microwave attenuation and infrared emission by rocket plumes were made on the basis of this model and appropriate thermochemical calculations. A simple computer solution is given. (Author)

Descriptors :   (*JET MIXING FLOW, EXHAUST GASES), ROCKET NOZZLES, RADAR SIGNALS, ATTENUATION, CHEMICAL REACTIONS, HEAT TRANSFER, TURBULENCE, AFTERBURNING, INFRARED RADIATION

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE