Pulsed detonation pre-chamber for planar high-speed flow ignition
V.A. Smetanyuk1, I.A. Sadykov1, P.O. Vinogradov1,2, Ya.S. Dudko1,2, S.M. Frolov1,2,3
1Semenov Federal Research Center for Chemical Physics of the Russian Academy of Sciences, Moscow, Russia
2National Research Nuclear University MEPhI, Moscow, Russia
3Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Science, Novosibirsk, Russia
Keywords: planar detonation pre-chamber, detonation wave, planar front, methane-oxygen mixture, ionization probe, apparent detonation velocity, numerical simulation, experimental test rig
Abstract
This study provides numerical and experimental validation for forming a planar detonation front within a pulsed detonation prechamber (PDP) designed for simultaneous, full-area ignition of high-speed flows. Using a two-stage simulation and experimental test rig, optimal geometries and operating conditions for a stoichiometric methane-oxygen mixture were established for the prechamber, manifold, and pre-detonation tube. Investigations demonstrate high convergence between numerical and experimental results for a single detonation pulse, confirming the invariance of the planar detonation wave front regardless of pre-filling conditions. Analysis substantiates that measured velocity peaks up to 3,500 m/s, exceeding the 2,380 m/s Chapman-Jouguet velocity, result from the geometric effect of apparent phase velocity, supporting application in advanced air-breathing engines.
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