题目：Pulsating Detonation of Liquid Ammonia
时间：2026年8月17日 10:00-11:30
地点：机械与动力工程学院 F310会议室
邀请人：夏溪 副教授（航空动力研究所）
Biography
Dr. Peng Zhang joined the City University of Hong Kong as an associate professor in 2022. Previously, he served as an assistant and then associate professor and associate head at the Hong Kong Polytechnic University from 2012 to 2022. Dr. Zhang’s current research areas are droplet and spray dynamics, theoretical and numerical combustion, theoretical chemical kinetics, and AI for science. He has published about 150 papers in international peer-reviewed journals in these areas.
Abstract
Liquid ammonia is a promising carbon-free energy carrier, but its high volatility and low reactivity lead to detonation dynamics that differ significantly from those of liquid hydrocarbons. Using Eulerian–Lagrangian simulations, we revealed a pulsating detonation phenomenon driven by the flash boiling of ammonia. Specifically, intense endothermic evaporation and exothermic combustion periodically weaken and then strengthen the coupling between the shock front and the reaction zone. A delay differential equation (DDE) model is developed to describe this pulsatory behaviour. In this model, the shock-response constraint—derived from the positive characteristic compatibility relation behind the shock front—is closed using delay-augmented relaxation models for evaporation and reaction progress variables. Perturbation analysis of the DDE system shows that an oscillatory solution emerges if the evaporation and reaction timescales are comparable. Simulation data across different evaporation models, droplet diameters, and ambient temperatures collapse onto the theoretical frequency band predicted by the model.
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