A New Ignition System for Pulse Detonation Engine

Shimada, H.; Kenmoku, Yasuhiro; Satō, Hiroyuki; Hayashi, A. Koichi

doi:10.2514/6.2004-308

Cited by 10 publications

(5 citation statements)

References 5 publications

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“…To further increase the jet velocity entering chamber, inspired by Ref. [18], the outlet of the hot jet tube has been designed as a sudden shrunken form as shown in Figure 6. Due to the narrow structure, convex flame propagates into the detonation chamber at a velocity of 333m/s.…”

Section: Mechanism Of Hot Jet Detonation Initiationmentioning

confidence: 99%

“…Since the hot jet detonation initiation is an effective detonation technique with short distance and low flow loss, it is one focus of current research. Shimada et al [18] firstly applied the hot jet tube on the detonation chamber to achieve a reliable detonation. Through visual experiments, it was found that a hot jet could quickly form a turbulent flame at the head of the detonation chamber and promote the formation of a detonation wave.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Hot Jet Detonation with Different Ignition Positions

et al. 2019

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Ignition position is an important factor affecting flame propagation and deflagration-to-detonation transition (DDT). In this study, 2D reactive Navier–Stokes numerical studies have been performed to investigate the effects of ignition position on hot jet detonation initiation. Through the stages of hot jet formation, vortex-flame interaction and detonation wave formation, the mechanism of the hot jet detonation initiation is analyzed in detail. The results indicate that the vortexes formed by hot jet entrain flame to increase the flame area rapidly, thus accelerating energy release and the formation of the detonation wave. With changing the ignition position from top to wall inside the hot jet tube, the faster velocity of hot jet will promote the vortex to entrain jet flame earlier, and the DDT time and distance will decrease. In addition, the effect of different wall ignition positions (from 0 mm to 150 mm away from top of hot jet tube) on DDT is also studied. When the ignition source is 30 mm away from the top of hot jet tube, the distance to initiate detonation wave is the shortest due to the highest jet intensity, the DDT time and distance are about 41.45% and 30.77% less than the top ignition.

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Section: Mechanism Of Hot Jet Detonation Initiationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Hot Jet Detonation with Different Ignition Positions

et al. 2019

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“…No matter what kind of detonation engine it is, effective detonation initiation is one of the key topics. The mainstream initiation methods include optical ignition, 3 shock wave focusing ignition, 4 nanosecond plasma ignition, 5 multipoint successive ignition, 6 and jet ignition 7 , etc. Ishii et al 8 obtained the detonation initiation and propagation process of hot jet in incoming flow with Mach numbers 0.9 and 1.2 through experimental study.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on detonation initiation process in the chamber with characteristic structures of the dual-mode scramjet combustor

Wei

Wang

Qin

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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In order to improve the performance of traditional ramjet, a ramjet based on pulse detonation (PD-Ramjet) instead of isobaric combustion was proposed. Several special-shaped detonation chambers which retained the characteristic structures of the dual-mode scramjet combustor were designed. Characteristic structures included the expansion channel and the cavity. The filling process and detonation initiation process of the stoichiometric hydrogen/air mixture under the incoming flow condition of the sub-combustion mode were studied in the detonation chambers with characteristic structures by two-dimensional numerical simulation method, and the influences of the characteristic structures on the filling process and detonation initiation process were analyzed. The simulation and analysis results indicated that the hydrogen concentration at both sides of the chamber near the outlet was low due to the structure of the expansion channel, and the pressure and velocity of the detonation wave decreased gradually after the expansion channel. The cavity had a significant influence on the filling process, which resulted in the uneven hydrogen concentration downstream the cavity, especially near the outlet of the chamber. The intensity of the detonation wave attenuated to a certain extent by reason of the cavity, where the peak pressure first decayed due to the sudden expansion of the flow path and then rose owing to the reflection at the cavity aft wall.

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“…Several reviews have been already presented at various meetings [1][2][3][4][5][6][7][8][9][10] and published in archival journals [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Wedge-and cone-induced oblique shock/detonation waves have received widespread attention due to their potential application in hypersonic propulsion devices.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of critical blockage ratio and pulse length in a pulse detonation engine using CFD and MATLAB

Srikrishnan¹,

Dash²,

Jayakumar

2018

MATEC Web of Conferences

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A Pulse Detonation Engine (PDE) is a new invented propulsion device that takes advantage of the pressure rise inherent to the efficient burning of fuel-air mixtures via detonations. Detonation initiation is a critical process that occurs in the cycle of a PDE. A practical method of detonation initiation is Deflagration-to-Detonation Transition (DDT), which describes the acceleration of a subsonic deflagration created using low initiation energies to a supersonic detonation. The DDT process is not well understood due to a wide range of time and length scales involving complex chemistry, turbulence and unsteady pressure waves. This paper discuss about the effects of blocking ratio in the augmentation of detonation pressure and velocity inside a cylindrical tube of diameter 0.0254m and a length of 1 m. The blockages are rectangular in shape placed at 2/3rd distances of the length of the tube and the heights of the blockages are varied in terms of the diameter of the tube as 1/4th, 1/3rd, ½, 2/3rd and 3/4th the diameter of the tube. The setup is then analyzed in MATLAB using the physics of Friedlander’s equation, which formulate the decay time duration of pressure across the tube length, with and without the blockage. Further, a 2D CFD analysis through ANSYS Workbench is conducted which gave the effective blocking ratio in a rectangular type of blockage placed at the 2/3rd position of the length of the tube and the results are compared. For variable pressures ranging from 1 MPa to 100 MPa input, the effective pulse length is around 0.25 seconds after which the decay of pressure and temperature attain the critical limit. Also it is found that the maximum feasible velocity occurs for an inlet pressure of 10 MPa and 2/3rd height of the blockage where the corresponding outlet velocity is 4692m/s and outlet total pressure being 10.542 MPa.

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A New Ignition System for Pulse Detonation Engine

Cited by 10 publications

References 5 publications

Numerical Simulation of Hot Jet Detonation with Different Ignition Positions

Numerical Simulation of Hot Jet Detonation with Different Ignition Positions

Numerical study on detonation initiation process in the chamber with characteristic structures of the dual-mode scramjet combustor

Evaluation of critical blockage ratio and pulse length in a pulse detonation engine using CFD and MATLAB

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