Experimental Study of Flow Field Produced When an Underexpanded Jet Exhausts Into a Constrictive, Stepped Launch Tube PDF Download

Author: John J. Bertin
Publisher:
ISBN:
Category :
Languages : en
Pages : 112

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Book Description
An underexpanded, supersonic jet of cold nitrogen was exhausted into a constrictive, stepped launch tube. For one launch tube, the reduction in cross section was accomplished abruptly by a rectangular step. For the other launch tube, the reduction in cross section was accomplished gradually by a 15 degree-ramp. Thirty-seven static-pressure orifices were located along the walls of the two tubes. By varying the location of the nozzle exit-plane with respect to the step location, one could simulate (in a quasi-steady manner) the effect of movement of the rocket through the launch tube. Pitot probes located in the annular region between the simulated rocket-nozzle and the launch tube provided information about the reverse, or blow-by, flow created when the nozzle exhaust encountered the constriction. (Modified author abstract).