Investigation of Hot Jet Effect on Detonation Initiation Characteristics

Wang, Zhiwu; Zhang, Yang; Chen, Xinggu; Liang, Zijian; Zheng, Longxi

doi:10.1080/00102202.2016.1225729

Cited by 16 publications

(3 citation statements)

References 7 publications

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“…The external region of the domain is pressure outlet. According to the research of Wang et al [26], the result of detonation initiation and hot jet was independent with the size of the mesh, so in order to obtain the accurate result by efficiently calculation, the grid size of the detonation tube was chosen as 0.5 mm, and the grid size of the left computational area was chosen as 1 mm. The total points of the meshes was about 0.1 million.…”

Section: Physical Modelsmentioning

confidence: 99%

Numerical simulation of the nozzle and ejector effect on the performance of a pulse detonation engine

Wang¹,

Liu²,

Wang³

et al. 2018

THERM SCI

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Single-shot pulse detonation engine (PDE) with three different types of nozzles-straight ejector combinational structures at three different ejector positions were simulated by the unsteady 2-D axisymmetric method. Three types of nozzles included the straight nozzle, convergent nozzle and convergent-divergent nozzle. Propane was used as the fuel and air as the oxidizer. The simulation results indicated that the PDE with a straight nozzle and PDE with a convergent-divergent nozzle obtained improved performance when an ejector was added at all of the three ejector positions (x /d =-1, 0 and +1), and PDE with a convergent-divergent nozzle gained the larger improved performance at all the three ejector positions.

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Section: Physical Modelsmentioning

confidence: 99%

Numerical simulation of the nozzle and ejector effect on the performance of a pulse detonation engine

Wang¹,

Liu²,

Wang³

et al. 2018

THERM SCI

Self Cite

View full text Add to dashboard Cite

show abstract

“…The external region of the domain was the pressure outlet. According to the research of Wang et al, 21 the result of detonation initiation and hot jet was independent with the size of the mesh, so in order to obtain the accurate result by efficient calculation, the grid size of the detonation tube was chosen as 0.5 mm, and the grid size of the external region was chosen as 1 mm. The adaptive mesh was used to achieve the goal of grid independence.…”

Section: Physical Models and Numerical Methodologymentioning

confidence: 99%

Oxygen concentration distribution in a pulse detonation engine with nozzle–ejector combinational structures

Wang

Wei

Qin

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part G:

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Pulse detonation engines (PDEs) with three different types of nozzle–straight ejector combinational structures at three different ejector positions were simulated by the unsteady 2-D axisymmetric method to understand the influence of nozzle–ejector combinational structures on the performance of PDEs. Three types of nozzles included the straight nozzle, convergent nozzle, and convergent–divergent (CD) nozzle. Three ejector positions were considered according to the ratio of the distance between the nozzle outlet and the ejector inlet to the diameter of PDEs (Δx/d). Propane was used as the fuel and air as the oxidizer. The simulation results indicated that for the PDE with the straight nozzle, it took the shortest time for high-temperature burnt gas to exhaust from the detonation tube. For the PDE with the CD nozzle, the time at which the ejector was filled with external air was the fastest. Within the time range of t = 0–10 ms, the ejected air was less than the original air in the ejector among all the nine combinational structures. The maximum ejected air was obtained with the convergent nozzle, followed by the CD nozzle, and the minimum with the straight nozzle. For certain nozzles, the maximum air was ejected at the ejector position of Δx/d = +1, followed by the ejector position of Δx/d = 0, and the minimum at the ejector position of Δx/d = −1. For the convergent nozzle–ejector combinational structure, the air ejection speed was the fastest. Oxygen concentration distribution in the PDE with the CD nozzle was more uniform along the axial direction than the other nozzles.

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“…From their experimental results, it was clearly seen that jet velocity played an important role in accelerating DDT, the faster jet velocity the shorter DDT distance. Wang et al [27] numerically investigated propane/air hot jet detonation initiation process by changing the length of jet tube, it was found that the increasing length of jet tube resulted in faster jet velocity, thus decreasing the initiation time and distance of DDT.…”

Section: Introductionmentioning

confidence: 99%

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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Investigation of Hot Jet Effect on Detonation Initiation Characteristics

Cited by 16 publications

References 7 publications

Numerical simulation of the nozzle and ejector effect on the performance of a pulse detonation engine

Numerical simulation of the nozzle and ejector effect on the performance of a pulse detonation engine

Oxygen concentration distribution in a pulse detonation engine with nozzle–ejector combinational structures

Numerical Simulation of Hot Jet Detonation with Different Ignition Positions

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