Unraveling and manipulating transverse wave dynamics in detonation systems- reactivity, stability, and multiplicity
Abstract
The proposed research explores a new mechanistic description of detonation propagation centered around transverse wave dynamics. The new description aims to bridge the gap between the understanding of idealized laboratory detonations and the more complex detonation dynamics observed in detonation engines. The underlying fundamental question this project will answer is-Why are multidimensional detonations able to propagate with vastly differing structures, e.g., spinning, rotating, cellular modes, and yet always at or near the Chapman-Jouguet (CJ) speed predicted by the structureless, thermodynamic theory. In this proposal, we hypothesize that Transverse waves (TWs), or the associated triple-shock structures, are the fundamental elements that enable detonation propagation in multidimensional geometries- Reactivity of TWs governs the leading detonation front propagation and complements the overall energy release ensuring global choking. Stability of TWs through exchanging energy and momentum among each other and with boundaries determines global detonation structures, e.g., spins and cells. Multiplicity of TWs disrupts the propagation stability, leading to irregularities. To examine the hypothesis, we propose a tightly-integrated experimental-computational research program to advance the fundamental understanding of TW physics with three objectives-Quantify structures, kinematics, and detailed energy and momentum transfer processes of transverse wave propagation and collisions in multidimensional detonations. Develop and validate suitable numerical models capable of resolving local transverse wave features and global detonation propagation properties. Leverage the transverse wave physics to demonstrate ideas for manipulating transverse waves and achieving stable, robust detonation processes especially those inside detonation engines. The proposed TW description, in contrast to the traditional detonation-cell-based understanding, provides a unifying theory for detonation propagation of various structures and modalities, reveals connectivity among adjacent local features, and links local flow behaviors to global properties. The outcomes of this project will not only extend the textbook knowledge of detonation and high-speed compressible reacting flow phenomena in general, but also provide key insights towards designing practical detonation engines, including optimizing combustion chamber geometries, fuel-oxidizer mixing and delivery systems, and engine control strategies to manipulate transverse wave dynamics and achieve desired operability, reliability, and efficiency.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 29, 2024
- Source ID
- FA95502310185
Entities
People
- Xian Shi
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of California, Irvine