|Table of Contents|

Study on thermodynamic non-equilibrium phenomenon of rarefied flow in micro-nozzle(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2020年03期
Page:
19-25,40
Research Field:
研究与设计
Publishing date:

Info

Title:
Study on thermodynamic non-equilibrium phenomenon of rarefied flow in micro-nozzle
Author(s):
ZHAO Ya;  YUAN Junya;  REN Xiang
(School of Astronautics, Beihang University, Beijing 100191, China)
Keywords:
micro-nozzle;  numerical simulation;  flow mechanism;  work performance;  thermodynamic non-equilibrium phenomenon
PACS:
V411.6
DOI:
-
Abstract:
As an important component in the micro-propulsion system, the study on the work performance of micro-nozzle has important theoretical guiding significance for the design of the micro-propulsion system. N-S equation with the slip boundary condition and direct simulated Monte Carlo(DSMC)method were used to study the rarefied flow in the micro-nozzle. The thermodynamic non-equilibrium phenomenon in the micro-nozzle was studied by setting the number of relaxation collision Zrot required for the rotational relaxation of the gas molecules. The results show that when Kn>0.1, the flow in the micro-nozzle begins to become rarefied, the continuity assumption fails, and the N-S equation results in errors. With the increase of the flow rarefaction in the micro-nozzle, the thermodynamic non-equilibrium phenomenon is gradually obvious. The thermodynamic non-equilibrium phenomenon reduces the amount of gas internal energy converted into translational kinetic energy in the micro-nozzle, which is followed by the velocity and thrust in the micro-nozzle decreasing. The thermodynamic non-equilibrium phenomenon has greater influence on the flow field of the micro-nozzle than on its working performance. The influence of considering the rotational relaxation on the temperature field is larger than the velocity field in the micro-nozzle

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Last Update: 2020-06-25