Numerical Performance Prediction of a Miniature at Mach 4
Loading...
Authors
Chen, Bingqiang
Subjects
Mach 4
Ramjet
Drag
Turbulence Modeling
Simulation
ANSYS CFX
Ramjet
Drag
Turbulence Modeling
Simulation
ANSYS CFX
Advisors
Hobson, Garth V.
Date of Issue
2012-09
Date
Sep-12
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
Using a 3-D axis-symmetric model, the cold-flow performance of a miniature ramjet in Mach 4 flow was predicted with the computational fluids dynamic (CFD) code from ANSYS-CFX. The nozzle-throat area was varied to increase the backpressure and this pushed the normal shock that was sitting within the inlet, out to the lip of the inlet cowl. Using the eddy dissipation combustion model in ANSYS-CFX, a combustion analysis was performed on the miniature ramjet. The analysis involved the single-step, stoichiometric combustion of hydrogen and oxygen within the combustion chamber of the ramjet. The drag force induced on the miniature ramjet when subjected to Mach 4 flow in a supersonic wind tunnel was measured using cryogenic strain gauges arranged in a Wheatstone bridge. A CFD cold-flow drag prediction was compared against this measured drag force to establish the formers accuracy in drag prediction. For all CFD predictions, the two-equation Shear-Stress-Transport (SST) turbulence model was used. The SST turbulence model blends the k-epsilon and k-omega turbulence model and effects the transportation of the turbulent shear stress for improved accuracy in turbulence modeling.
Type
Thesis
Description
Series/Report No
NPS Outstanding Theses and Dissertations
Department
Engineering Science (Mechanical Engineering)
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.