UNSTEADY FLOW, SHOCK AND COMBUSTION PHYSICS IN HIGH REYNOLDS NUMBER SYSTEMS
Abstract
Starting with rotating detonation combustors (RDC) – work over the last decade has clearly demonstrated the viability of the concept. A variety of issues and questions emerge around these devices, including unsteady fuel/oxidizer injection, mixing and combustion in the impulsive flow environment, wave dynamics in the annular passage, and wave interactions with the fuel injectors and nozzle. While the basic viability of RDC as a pressure gain device has been demonstrated, the critical remaining question is whether they can be made to achieve reasonable performance values. As such, the key objective of this work is to better understand the factors that influence injector dynamics/coupling, and detonation wave strength. A key goal of this work is to enable development of tuned, low pressure drop injection schemes that could provide even better RDC performance than high pressure drop, stiff injection systems. Similarly, in steady flowing combustion devices, a significant amount of turbulent combustion work has been done as part of the AFOSR portfolio over the last 5 years. This work has addressed turbulent burning velocity, spectral energy transfer, and flame dynamics in highly intense turbulence, but fundamental questions remain around controlling physics at operating conditions representative of Air Force platforms. As such, autoignition-influenced systems inherently have spatio-temporally evolving ignition and flame propagation sites. There is still a large hole in the literature on controlling physics of turbulent combustion under these conditions. The goal of the proposed research is to elucidate the physics of combusting flows where the reacting regions are controlled by hybrid interplay of autoignition and flame propagation.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2021
- Source ID
- FA95502010215
Entities
People
- Tim Lieuwen
Organizations
- Air Force Office of Scientific Research
- Georgia Tech Research Corporation
- United States Air Force