SPEED-RATIO MEASUREMENTS IN NONEQUILIBRIUM NOZZLE AND FREE-JET EXPANSIONS.
Interim scientific rept.,
CORNELL AERONAUTICAL LAB INC BUFFALO N Y
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A new probe is described for determining the molecular speed ratio in low-density flows. The probe functions by measuring stagnation point heat transfer and flat plate heat transfer in free-molecule flow. The ratio of these two measurements can be interpreted as the speed ratio. Experimental shock tunnel data obtained in essentially undissociated air are presented to calibrate the probe and to demonstrate the accuracy of the speed-ratio determinations. Following this, measurements obtained in high temperature, dissociated air are presented to show the consequences of nozzle nonequilibrium. These speed-ratio measurements are in good agreement with existing theory when vibrational freezing is taken into account. Exploratory speed-ratio measurements in a free-jet expansion of argon are compared with existing theory to demonstrate that the translational temperature departs from an isentropic behavior at low densities. Author
- Fluid Mechanics