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Multi-scale Physics of Rotating Detonation Engines: Autosolitons and Modulational Instabilities by Koch, James; Kurosaka, Mitsuru; Knowlen, Carl; Kutz, J. Nathan is a scholarly article available to read on EtoBox.

What is Multi-scale Physics of Rotating Detonation Engines: Autosolitons and Modulational Instabilities about?

We develop a theoretical framework that predicts and fully characterizes the diverse experimental observations of the nonlinear, combustion wave propagation in a rotating detonation engine (RDE), including the nucleation and formation of combustion pulses, the soliton-like interactions between these combustion fronts, and the fundamental, underlying Hopf bifurcation to time-periodic modulation of the waves. In this framework, the mode-locked structures are classified as autosolitons, or stably-propagating nonlinear waves where the local physics of nonlinearity, dispersion, gain, and dissipation exactly balance. We find that the global dominant balance physics in the RDE combustion chamber are dissipative and multi-scale in nature, with local fast scale (nano- to microseconds) combustion balances generating the fundamental mode-locked autosoliton state, while slow scale (milliseconds) gain-loss balances determine the instabilities and structure of the total number of autosolitons. In this manner, the global multi-scale balance physics give rise to the stable structures - not exclusively the frontal dynamics prescribed by classical detonation theory. Experimental observations and num

Author

Koch, James; Kurosaka, Mitsuru; Knowlen, Carl; Kutz, J. Nathan

Published

2020

Language

EN