Structure of the detonation front in gases (survey)

Voǐtsekhovskiǐ, B. V.; Митрофанов, В. В.; Topchiyan, M. E.

doi:10.1007/bf00748606

Cited by 50 publications

(29 citation statements)

References 9 publications

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“…Many experimental studies have been conducted in this ¦eld at numerous laboratories. In early 1960s, Voitsekhovskii, Mitrofanov, and Topchiyan performed ¦rst experiments on continuously rotating detonation [2,1]. In 2004, Wolanski and Fujiwara in cooperation with Mitsubishi Co. applied for a patent on the RDE [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of the rotating detonation engine in hydrogen-air mixtures

Kindracki

Kobiera

Wolański

et al. 2011

Progress in Propulsion Physics

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Experimental and numerical study of rotating detonation is presented. The experimental study is focused on the evaluation of the geometry of the detonation chamber and the conditions at which the rotating detonation can propagate in cylindrical channels. Lean hydrogen air mixtures were tested in the experiments. The pressure measured at di¨erent locations was used to check the detonative nature of combustion. Also, the relationship between detonation velocity and operation conditions is analyzed in the paper. The experimental study is accompanied with numerical analysis. The paper brie §y presents the results of two-dimensional (2D) numerical simulation of detonative combustion. The detonating mixture is created by mixting hydrogen with air. The air is injected axially to the chamber and hydrogen is injected through the inner wall of the chamber in radial direction. Application of proper injection conditions (pressure and nozzle area) allows establishing a stable rotating detonation like in the experiments. The detonation can be sustained for some range of conditions which are studied herein. The analysis of mean parameters of the process is provided as well. The numerical simulation results agree well with the experiments.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of the rotating detonation engine in hydrogen-air mixtures

Kindracki

Kobiera

Wolański

et al. 2011

Progress in Propulsion Physics

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“…0.9 U CJ is representative of the incident wave velocity near the end of the cell cycle. 2,8,18 The incoming flow angle is taken to be 33…”

Section: Initial Conditions: Triple Point Calculationmentioning

confidence: 99%

“…The importance of the finite rate chemistry in the perturbation equation are determined by investigating the growth rate and the eigenfunctions for spatial evolution controlled by the frozen flow perturbation equations, and a mean flow defined by the reactive Navier-Stokes equations, equation (2). This analysis is restricted to the propane system.…”

Section: G Finite Rate Chemistry Effectmentioning

confidence: 99%

“…However, the reaction rate behind the shock is extremely sensitive to perturbations in the post-shock temperature and as a result gaseous detonation waves are always unstable. Past work [1][2][3][4][5][6] has revealed an extremely complex structure: the front is unstable in three-dimensions and also highly unsteady. The strength of the lead shock oscillates periodically in time and in space and detonations exhibit systems of counter-propagating transverse shock waves, Fig.…”

Section: Introductionmentioning

confidence: 99%

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Triple point shear-layers in gaseous detonation waves

Massa

Austin

Jackson

2006

42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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Recent experiments have shown intriguing regions of intense luminescence or "hot spots" in the vicinity of triple point shear-layers in propagating gaseous detonation waves. Localized explosions have also been observed to develop in these fronts. These features were observed in higher effective activation energy mixtures, but not in lower effective activation energy mixtures. We investigate the possibility that the increased lead shock oscillation through a cell cycle in higher activation energy mixtures may result in a significantly increased disparity in the induction time on either side on the triple point shear-layer, increasing the probability that shear-layer instability may develop between reacted and unreacted gas streams. We carry out two-dimensional simulations with detailed chemical kinetics to examine the nature of the triple point shear-layer in three mixtures with different effective activation energy. In the low activation energy mixture, large scale vortical structures are observed to occur downstream of the ignition distance; these structures do not have a noticeable effect on the reaction. In higher effective activation energy mixtures, a transverse ignition front develops near the interface between the two gas streams and results in a rapidly propagating reaction front. The transverse ignition front develops due to molecular diffusion across the shear-layer between hot and cold gas streams.

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“…LANAR detonation waves are often created in narrow rectangular channels to more easily visualize the cellular structure of gaseous detonation waves [1][2][3][4][5][6]. Typically, these detonation waves are initiated from a single high-energy source requiring several kilojoules of input energy, such as a strong spark or exploding wire that creates a spherically or cylindrically expanding wave.…”

Section: Introduction Pmentioning

confidence: 99%