Baroclinic and dilatational effects in highly compressible reactive flows
Abstract
Small-scale compressibility effects in reactive turbulence- Compressible reactive flows(1) form the core component of propulsion devices. In detonation-based combustion, compressibility aspects play an even more active role. While the engineering interest in developing high-speed propulsion devices has resurged, a thorough understanding of the associated hydrodynamic flow-field remains a topic of research, because turbulent fluctuations differ from the conventionally studied incompressible constant density turbulence. In compressible reactive flows however, the vorticity equation (also a proxy for turbulent dissipation rate) has two additional source terms- namely the baroclinic and the dilatational terms. In large-eddy simulations, where equations solve for the spatially filtered (coarse-grained) variables, these terms introduce two additional subgrid-scale effects-The baroclinic terms arises from misaligned pressure and density gradients. In compressible reactive flows, this occurs during interaction of waves, contacts and reaction fronts. The dilatational term conserves angular momentum when the gas expands on heat release.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 06, 2025
- Source ID
- FA95502410202
Entities
People
- Sidharth Gs
Organizations
- Air Force Office of Scientific Research
- Iowa State University
- Office of the Secretary of Defense