Vincent Cichowicz - Flow Studies. Trumpet - no meter, with a very consistent flow of air. Vincent Cichowicz - Long Tone Studies up to D above Staff.pdf.

Experimental study of low Reynolds number nozzles NTRS Full-Text: [PDF Size: 783 KB] Author and Affiliation: Grisnik, Stanley P. (NASA Lewis Research Center, Cleveland, OH, United States) Smith, Tamara A. (NASA Lewis Research Center, Cleveland, OH, United States) Saltz, Larry E. (Rocket Research Corp., Redmond, Wash., United States) Abstract: High-performance electrothermal thrusters operate in a low nozzle-throat Reynolds number regime. Under these conditions, the flow boundary layer occupies a large volume inside the nozzle, contributing to large viscous losses.

Four nozzles (conical, bell, trumpet, and modified trumpet) and a sharp-edged orifice were evaluated over a Reynolds number range of 500 to 9000 with unheated nitrogen and hydrogen. The nozzles showed significant decreases in specific impulse efficiency with decreasing Reynolds number. At Reynolds numbers less than 1000, all four nozzles were probably filled with a large boundary layer.

The discharge coefficient decreased with Reynolds number in the same manner as the specific impulse efficiency. The bell and modified trumpet nozzles had discharge coefficients 4 to 8 percent higher than those of the cone or trumpet nozzles. The Two-Dimensional Kinetics (TDK) nozzle analysis computer program was used to predict nozzle performance. The results were then compared to the experimental results in order to determine the accuracy of the program within this flow regime. Publication Date: Jan 01, 1987 Document ID.

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