Numerical study of axisymmetric gas flow in conical micronozzles by DSMC and continuum methods
Conference
Mo, H, Lin, C, Gokaltun, S et al. (2006). Numerical study of axisymmetric gas flow in conical micronozzles by DSMC and continuum methods
. 16 11857-11866. 10.2514/6.2006-991
Mo, H, Lin, C, Gokaltun, S et al. (2006). Numerical study of axisymmetric gas flow in conical micronozzles by DSMC and continuum methods
. 16 11857-11866. 10.2514/6.2006-991
Gas flow in conical micronozzles was numerically studied by DSMC and continuum methods. Experimental data of helium flow in a converging-diverging nozzle with throat diameter of 1 mm were used as the reference problem. In the experiment, the throat Reynolds number ranged from 0.16 to 22.69 and the flow experienced the transition from slip to transitional regimes at the nozzle entrance. 2D axisymmetric models were used for both DSMC and continuum methods with slip wall boundary condition applied in the latter one. The two different approaches were validated with the experimental data and compared with each other for performance evaluations. For throat Reynolds number larger than 10, the two numerical methods predicted nozzle exit thrust values in agreement with the experimental data. Pressure and Mach number contours were similar in pattern, but different in magnitude and smoothness of distributions. DSMC method predicts larger thrust value compared to continuum solution for Re < 10 where the flow is in transition regime.
