
Theses and Dissertations
ORCID
https://orcid.org/0009-0004-2420-5761
Issuing Body
Mississippi State University
Advisor
Bhushan, Shanti
Committee Member
Zope, Anup
Committee Member
Hwang, Joonsik
Date of Degree
12-13-2024
Original embargo terms
Worldwide
Document Type
Graduate Thesis - Open Access
Major
Mechanical Engineering
Degree Name
Master of Science (M.S.)
College
James Worth Bagley College of Engineering
Department
Michael W. Hall School of Mechanical Engineering
Abstract
In the present work, we aim to investigate the predictive capabilities of low and high-fidelity turbulence models and understand how they perform in complex conditions in a scramjet engine. In this study, we use the DLR experiments to present a comparative performance assessment of low to high fidelity turbulence models. The DLR case is interesting since it exhibits turbulence due to wall effects as well as due to shear layer. Results show relatively good agreement when compared against the validation data set from the experiment. DHRL was able to resolve more turbulence structures compared to all other models. HRL showed better prediction of the momentum deficit in the wake of the strut than all other models. Additionally results for reacting case show that choice of turbulence models affects the intensity and lift-off distance of the flame where RANS and DHRL show the most rigorous flame and a smooth peak in temperature profile near the base of the strut at the centerline while IDDES and HRL show no combustion at the same location. Comparison against computational results shows an underprediction of the flame lift-off distance.
Recommended Citation
En-nali, Mohamed, "Effects of Turbulence on Scramjet Engines Combustion" (2024). Theses and Dissertations. 6413.
https://scholarsjunction.msstate.edu/td/6413