THERMAL RECOVERY FACTORS IN SUPERSONIC FLOWS OF GAS MIXTURES.
PURDUE UNIV LAFAYETTE IND PROJECT SQUID HEADQUARTERS
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Thermal recovery factors were measured at the stagnation point of a hemispheric probe in low density supersonic jets of helium-argon and hydrogen-nitrogen mixtures. A guard heater in the probe made it possible to eliminate conduction losses. Radiation corrections were small. The final values correspond to adiabatic conditions. With jets of mixed gases the experimental recovery factors were as high as 1.6, substantially above the free molecule limit for pure gases. It is suggested that these anomalously high values are due to the species separation which occurs during the stagnation process and which results in concentrations of heavy species in the stagnation zone higher than in the free stream. The results are correlated in terms of the degree of rarefaction and the composition of the source gas. Author
- Fluid Mechanics