Combined Effects of Vortex Flow and the Shchelkin Spiral Dimensions on Characteristics of Deflagration-to-Detonation Transition

Asato, Katsuo; Miyasaka, Takeshi; Watanabe, Yuta; Tanabashi, Kouki

doi:10.1007/978-3-642-25688-2_54

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…PDTE generally adopts indirect detonation method to reduce engine ignition energy, but indirect detonation method has a deflagration to detonation (DDT) distance, and the structure of obstacles in the combustion chamber has a greater impact on the DDT distance. Asato et al [12] studied the influence of the Shchelkin spiral obstacles on the DDT distance, and pointed out that the Shchelkin spiral obstacles can promote the generation of gas vortex, and the DDT distance can be shortened by 50-57%. Valiev et al [13] stated that the physical mechanism of flame acceleration in channels with obstacles was qualitatively different from the classical Shelkin mechanism.…”

Section: Introductionmentioning

confidence: 99%

Research on the influence of different obstacle structures on the energy distribution characteristics of pulse detonation gas

Xiao

Wang

et al. 2022

THERM SCI

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In order to improve the gas energy conversion efficiency at the outlet of the pulse detonation combustor, numerical calculation methods were used to study the influence of three different cross-section obstacle structures of square, circle and trapezoid on the distribution characteristics of gas pressure potential energy, kinetic energy and internal energy in a single cycle at the outlet of pulse detonation combustor. The results show that: the expansion of pulse detonation gas mainly includes three stages: primary expansion, secondary expansion, and over-expansion. Gas pressure potential energy, kinetic energy and internal energy increase during the primary and secondary expansion stages, and decrease during the over-expansion stage; Pulse detonation combustor with trapezoidal cross-section obstacle structure has the smallest proportion of gas energy at the outlet of the combustor during the over-expansion stage and the highest proportion during the secondary expansion stage; compared with square and circle cross-section obstacle structures, the gas energy distribution at the outlet of the pulse detonation combustor with trapezoidal cross-section obstacle structure is the easiest for turbomachinery to convert the gas energy.

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Section: Introductionmentioning

confidence: 99%

Research on the influence of different obstacle structures on the energy distribution characteristics of pulse detonation gas

Xiao

Wang

et al. 2022

THERM SCI

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“…Studies were done for spiral internal grooves like semicircle, square and inversed triangle groove and these were found to enhance DDT transition. Asato et al [11] studied flame propagation, Shchelkin spiral dimension in flow vortex on deflagration to detonation transition characteristics and as well as rotating velocity. The result showed that deflagration to detonation transition distance in the vortex flows is shortened by 50-57% using Shchelkin spiral.…”

Section: Introductionmentioning

confidence: 99%

Computational Study on Effect of Obstacles in Pulse Detonation Engine

Tripathi¹,

Pandey²,

Randive³

2018

IJET

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Deflagration to Detonation transition is an important factor in the operation of pulse detonation engine which is basically working on the constant volume cycle. Insertion of obstacles decreases the DDT length. Hydrogen and the oxygen-enriched air was used as fuel and oxidizer respectively. The Purge gas is not required used. K-ԑ turbulence model is being used for the simulation and for combustion species transport model is being used. Effect of blockage ratio and obstacle spacing is also discussed. A blockage ratio of 0.5 is considered for the Shchelkin spiral. Temperature profile, flame propagation velocity and average peak pressure variation are discussed. Twodimensional geometry and Shchelkin shape of obstacles are being considered. The comparison is done between straight tube and tube with obstacles. Numerical simulation is done and the results are being compared with those obtained through experimental investigation.

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Combined Effects of Vortex Flow and the Shchelkin Spiral Dimensions on Characteristics of Deflagration-to-Detonation Transition

Cited by 2 publications

References 3 publications

Research on the influence of different obstacle structures on the energy distribution characteristics of pulse detonation gas

Research on the influence of different obstacle structures on the energy distribution characteristics of pulse detonation gas

Computational Study on Effect of Obstacles in Pulse Detonation Engine

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