The evolution of fast turbulent deflagrations to detonations
Abstract
We use advanced experimental techniques to explore turbulence-induced deflagration-to-detonation transition (tDDT) in hydrogen–air mixtures. We analyze the full sequence of turbulent flame evolution from fast deflagration-to-detonation using simultaneous direct measurements of pressure, turbulence, and flame, shock, and flow velocities. We show that fast turbulent flames that accelerate and develop shocks are characterized by turbulent flame speeds that exceed the Chapman–Jouguet deflagration speed in agreement with the tDDT theory and direct numerical simulation (DNS) results. Velocity and pressure evolutions are provided to detail the governing mechanisms that drive turbulent flame acceleration. Turbulent flame speeds and fluctuations are examined to reveal flow field characteristics of the tDDT process. This work contributes to the understanding of fundamental mechanisms responsible for spontaneous initiation of detonations by fast turbulent flames.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 01, 2023
- Source ID
- 10.1063/5.0144663
Entities
People
- Alexei Poludnenko
- Hardeo M. Chin
- Jessica Chambers
- K Ahmed
- Rachel Hytovick
- Vadim N. Gamezo
Organizations
- Air Force Office of Scientific Research
- National Science Foundation
- University of Central Florida
- University of Connecticut