Effect of low Reynolds number turbulence amplification on the Galileo probe flowfield
Abstract
The amplification of turbulence at low Reynolds numbers is analyzed as it affects the Jupiterentry flowfield, surfaceheating rate, and massloss rate of the 335kg Galileo probe now being designed. The constant k(2) in the ClauserKlebanoff outer law of the twolayer algebraic eddyviscosity model of Cebeci (1970), as used in earlier models of the Galileo flowfield (Moss and Simmonds, 1982), is modified to increase at low Reynolds numbers, as found experimentally by Varner and Adams (1980). Calculations were performed for peak heating conditions (at 49.13 sec of entry), using a turbulent Prandtl number of 0.9 and turbulent Lewis numbers (LeT) of 0.8, 1.0, and 1.2. The lowReynoldsnumber effect is found to produce masslossratio increases of from 4 to 50 percent, while an LeT of 1.2 produced an increase of from 4 to 10 percent as compared to an LeT of 1.0. While these findings are based on experimental data obtained under conditions somewhat different from those probably present on Jupiter, their importance for a conservative probe design is stressed.
 Publication:

Journal of Spacecraft and Rockets
 Pub Date:
 August 1983
 DOI:
 10.2514/3.25619
 Bibcode:
 1983JSpRo..20..409G
 Keywords:

 Ablation;
 Galileo Probe;
 Low Reynolds Number;
 Reentry Physics;
 Turbulence Effects;
 Eddy Viscosity;
 Jupiter Atmosphere;
 Mass Flow Rate;
 Surface Temperature;
 Astrodynamics