期刊
VACUUM
卷 128, 期 -, 页码 166-177出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2016.03.020
关键词
Vacuum plume interaction; Hydrogen/oxygen; Dual thrusters; CFD-DSMC; Secondary jet
In spacecrafts such as high-altitude rockets and lunar landers, multiple thrusters or engines operate simultaneously with a small separation distance. Thus, the plume interaction may cause a different three-dimensional flow field with a single plume or plumes separated by a large distance. To study the flow field of the plume interaction, a hydrogen/oxygen sample thruster with a thrust of 60 N with the same propellant, mixing ratio, and shrunken bell-nozzle profile as an actual engine was first designed and tested in the Vacuum Plume Effects Experimental System (PES). The pressure field of the plume was determined using a pitot-tube array. The experimental data were compared with the results from a numerical solution that combined both computational fluid dynamics (CFD) and direct simulation Monte Carlo (DSMC) analyses, and a favorable agreement was obtained, demonstrating the application ability of the CFD-DSMC method to predict the plume flow field. Subsequently, two identical sample thrusters were modeled with a separation distance ranging from 1.0 to 3.0 times the diameter of the nozzle exit and a deflection angle ranging from 0 degrees to 20 degrees, and the plume interactions were numerically investigated. (C) 2016 Elsevier Ltd. All rights reserved.
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