EXPERIMENTAL STUDY OF NON-EQUILIBRIUM TURBULENCE-CHEMISTRY INTERACTION IN EXTERNAL HYPERSONIC FLOWS
Abstract
Turbulence chemistry interaction is a natural phenomenon that is expected to occur in high-speed flights. For external flows, this m,ight be in the form of air-chemistry, ablation or surface oxidation chemistry interacting with the turbulence field in the boundary,layer. While for internal combusting flows, this interaction will be with key combustion species/radicals with the turbulence leadin,g to changes in heat release patterns. While some earlier works have undertaken DNS and other studies, there is a missing body of wo,rk that is needed in order to understand the intricate relationships that this interaction can bring about. For instance, in ablatin,g layers what is the role of turbulence in transporting the various species and how does this affect the ablation process and result,ant thermal protection? In scramjet combustors, how does chemical heat release get impacted by interaction with turbulence, and does, this affect the modes of combustion? This project will aim to address these questions by employing The University of Queenslands s,uite of unique high-enthalpy, hypersonic test facilities (the T4 reflected shock tunnel, X2 expansion tube and X3/R expansion tunnel,/reflected shock tunnel) on canonical models. Both internal supersonic combustion experiments and external flow experiments, includi,ng ablating flows, will be conducted. We will employ our capabilities in undertaking heated model tests to interrogate the effect of, wall heating (via the recovery-temperature-to-wall-temperature ratio Tr/Tw) on turbulence chemistry interaction. A variety of measu,rements that include standard surface sensors (pressure/heat transfer gauges) as well as novel, custom-made sensors (high spatio-tem,poral resolution thin-film heat transfer gauges) and other advanced optical diagnostic techniques that our group has developed (such, as cylindrical focused laser differential interferometry) will be deployed in this work. The project aims to work collaboratively w,ith the MURI team in the U.S. in utilising our experimental outputs to inform model development (with U. Michigan and U. Southern Ca,lifornia) as well as validation (with Purdue/U. Illinois) besides providing complementary data to other experimental efforts (such a,s at the U. Illinois).
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 05, 2022
- Source ID
- N000142212151
Entities
People
- Ananthanarayanan Veeraragavan
Organizations
- Office of Naval Research
- United States Navy
- University of Queensland