Accession Number : AD0872106

Title :   Influence of Chemical Kinetic and Turbulent Transport Coefficients on Afterburning Rocket Exhaust Plume Properties,

Corporate Author : AEROCHEM RESEARCH LABS INC PRINCETON NJ

Personal Author(s) : Pergament, H. S. ; Jensen, D. E.

Report Date : 1970

Pagination or Media Count : 28

Abstract : The influence of chemical kinetic and turbulent transport coefficients on afterburning rocket exhaust plume properties was analyzed in terms of predicted radar attenuations transverse to solid propellant plumes. A model of parallel turbulent mixing and nonequilibrium combustion and ionization was used to determine whether varying these coefficients, which are input data to the model, over their ranges of uncertainty has a significant effect on the predicted attenuation. The results of the study demonstrate that significant differences in predicted attenuation levels can result when the important reaction rate and turbulent transport coefficients are varied within their respective error bounds. This establishes the framework within which to interpret radar attenuation data taken at sea level and under simulated altitude conditions. It is also shown that a better laboratory determination of the rate coefficient for the dominant charge-producing reaction, K + Cl yielding K(+) + Cl(-), is of particular importance if more accurate attenuation predictions are to be made. It was concluded that realistic calculations of solid propellant exhaust plume electrical properties must take chemical kinetics into account. (Author)

Descriptors :   *AFTERBURNING), (*EXHAUST GASES, (*SOLID ROCKET PROPELLANTS, EXHAUST GASES), REACTION KINETICS, TURBULENCE, TRANSPORT PROPERTIES, RADAR, POTASSIUM, CHLORINE, CHEMICAL REACTIONS, ELECTRICAL PROPERTIES, IONIZATION.

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE