Analysis of Single and Dual Under-Expanded, Rarefied Jets

Authors

Wenhai Li

Type

Text

Type

Dissertation

Advisor

Robert Kukta | Shuryak, Edward | Xiaoin Li.

Date

2010-12-01

Keywords

DSMC, Interacting Jets, Rarefied Flows, Under-Expanded | Mechanical Engineering -- Aerospace Engineering

Department

Department of Mechanical Engineering

Language

en_US

Source

This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree.

Identifier

http://hdl.handle.net/11401/72581

Publisher

The Graduate School, Stony Brook University: Stony Brook, NY.

Format

application/pdf

Abstract

A numerical study, using the Direct Simulation Monte Carlo (DSMC) approach, of the interaction effects between two identical sonic under-expanded nitrogen jets under rarefied conditions is reported. In this paper, the effects of the jet stagnation Knudsen number (Kn_s), the ratio of the stagnation-to-background pressure (P_s/P_b), and the distance between the jet orifices (L/D) were investigated for a range of these parameters. The background pressure has a very significant effect on the physics of flow, and the interactions between the two jets affect the location of the Mach disks for both the primary and secondary jets. When P_s/P_b is relatively large (P_s/P_b>200), the separation distance L/D has only a mild effect on the location of the Mach disk in the secondary jet. A study of the rotational-translational non-equilibrium showed large deviations between the translational and rotational temperatures in the vicinity of the orifice plate.

Recommended Citation

Li, Wenhai, "Analysis of Single and Dual Under-Expanded, Rarefied Jets" (2010). Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions). 1785.
https://commons.library.stonybrook.edu/stony-brook-theses-and-dissertations-collection/1785