Accession Number : AD0785198

Title :   A Study of the Effects of Different Turbulent Heating Estimates and Boundary Layer Transition Onset Criteria on the Heating to a Lifting Entry Vehicle,


Personal Author(s) : Pearce,Blaine

Report Date : 31 MAR 1970

Pagination or Media Count : 33

Abstract : Calculations of the peak temperature in fully turbulent flow along the centerline of the windward surface of a flat delta wing with 80-deg sweep are given for four simple estimates of the turbulent heating rates and four criteria for the onset of boundary layer transition. Angles of attack up to 60 deg are considered and equilibrium glide trajectories are used. The four methods of estimating the heat transfer are Eckert's reference enthalpy, the adiabatic wall reference enthalpy, Spalding and Chi, and the reference density-viscosity methods. The effect of transition onset location is examined for a length Reynolds number criterion that is either a constant or a function of Mach number and also for a momentum thickness Reynolds number that is either a function of Mach number or Mach number and angle of attack. (Modified author abstract)

Descriptors :   *Lifting reentry vehicles, *Turbulent flow, *Aerodynamic heating, Boundary layer transition, Angle of attack, Delta wings, Trajectories, Enthalpy, Heat transfer

Subject Categories : Thermodynamics
      Spacecraft Trajectories and Reentry

Distribution Statement : APPROVED FOR PUBLIC RELEASE