Accession Number : AD0427686


Title :   A New Quasi One-Dimensional Model for Turbulent Wake Mixing


Descriptive Note : Research note


Corporate Author : HELIODYNE CORP LOS ANGELES CA


Personal Author(s) : Proudian, Andrew P


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/427686.pdf


Report Date : Jan 1964


Pagination or Media Count : 39


Abstract : A new model for turbulent wake mixing is proposed. The model, which appears supported by laboratory experiments and which is made plausible on physical grounds, considers the wake as consisting of a ''marble cake'' structure of hot and cold lumps being mixed into the wake by the large eddies of the turbulent wake. A dynamical (one-dimensional) model for the mixing leads to a simple set of equations which can be numerically integrated to yield the temperature, density and velocity of the hot and cold wake components. The inclusion of chemistry in the model would yield wake composition. The model permits the prediction of mean square mass and electron density fluctuations. The fluctuations are assumed to arise from random convection of inhomogeneous fluid elements, rather than by compressibility effects or dissipation associated with the turbulent velocity field. The consequences of such mixing for the spectrum of a scalar additive in a wake are qualitatively discussed. Comparison of predicted values of gas density fluctuation with experimental results show encouraging agreement, and warrant further development of the model.


Descriptors :   *REENTRY VEHICLES , *WAKE , CONVECTION , DENSITY , ELECTRON DENSITY , FLUID DYNAMICS , GAS FLOW , HEAT TRANSFER , JET MIXING FLOW , MATHEMATICAL MODELS , ONE DIMENSIONAL FLOW , RADAR CROSS SECTIONS , TEMPERATURE , THERMODYNAMICS , TURBULENCE , VELOCITY


Subject Categories : Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE