Detonation of propane-air mixtures under injection of hot detonation products

Таржанов, В. И.; Telichko, I. V.; Vildanov, V. G.; Sdobnov, V. I.; Makarov, A. E.; Mukhin, S. L.; Koretskii, I. G.; Ogarkov, V. A.; Vlasov, Vitaly V.; Zinchenko, A. D.; Воробьев, А. В.; Грачев, А Н; Matkin, V. A.; Potashnikov, V. A.

doi:10.1007/s10573-006-0060-4

Cited by 7 publications

(3 citation statements)

References 14 publications

(21 reference statements)

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“…Despite the fact that the FeAl phase is stable up to 1310 °C ( Figure 4 ), the first temperature range was selected to be from 0 °C to 1395 °C, which is the model liquidus temperature for the Fe40Al at.% alloy. The second range from 1395 °C to the conventional evaporation temperature of 2690 °C was determined on the basis of the arithmetic mean of the evaporation temperatures of Al and Fe [ 30 , 31 , 32 , 33 , 34 , 35 ].…”

Section: Technological Conditions In Dgs Processmentioning

confidence: 99%

Effects of Heat and Momentum Gain Differentiation during Gas Detonation Spraying of FeAl Powder Particles into the Water

et al. 2021

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In this paper, dynamic interactions between the FeAl particles and the gaseous detonation stream during supersonic D-gun spraying (DGS) conditions into the water are discussed in detail. Analytical and numerical models for the prediction of momentum and complex heat exchange, that includes radiative effects of heat transfer between the FeAl particle and the D-gun barrel wall and phase transformations due to melting and evaporation of the FeAl phase, are analyzed. Phase transformations identified during the DGS process impose the limit of FeAl grain size, which is required to maintain a solid state of aggregation during a collision with the substrate material. The identification of the characteristic time values for particle acceleration in the supersonic gas detonation flux, their convective heating and heat diffusion enable to assess the aggregation state of FeAl particles sprayed into water under certain DGS conditions.

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Section: Technological Conditions In Dgs Processmentioning

confidence: 99%

Effects of Heat and Momentum Gain Differentiation during Gas Detonation Spraying of FeAl Powder Particles into the Water

et al. 2021

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“…Tarzhanov et al [13] investigated using hot detonation products to detonate stagnant propane-air mixtures. They found that detonation initiation depends on the initial volume concentrations of the mixture, mass fraction of hot detonation products, and the energy deposited from the detonation products.…”

Section: Introductionmentioning

confidence: 99%

Ignition by Hot Transient Jets in Confined Mixtures of Gaseous Fuels and Air

Karimi

Nalim

2016

Journal of Combustion

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Ignition of a combustible mixture by a transient jet of hot reactive gas is important for safety of mines, prechamber ignition in IC engines, detonation initiation, and novel constant-volume combustors. The present work is a numerical study of the hot jet ignition process in a long constant-volume combustor (CVC) that represents a wave rotor channel. The hot jet of combustion products from a prechamber is injected through a converging nozzle into the main CVC chamber containing a premixed fuel-air mixture. Combustion in a two-dimensional analogue of the CVC chamber is modeled using a global reaction mechanism, a skeletal mechanism, or a detailed reaction mechanism for three hydrocarbon fuels: methane, propane, and ethylene. Turbulence is modeled using the two-equation SSTk-ωmodel, and each reaction rate is limited by the local turbulent mixing timescale. Hybrid turbulent-kinetic schemes using some skeletal reaction mechanisms and detailed mechanisms are good predictors of the experimental data. Shock wave traverse of the reaction zone is seen to significantly increase the overall reaction rate, likely due to compression heating, as well as baroclinic vorticity generation that stirs and mixes reactants and increases flame area. Less easily ignitable methane mixture is found to show slower initial reaction and greater dependence on shock interaction than propane and ethylene.

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“…Chemically reactive radicals (e.g., H and OH) and jet-induced turbulence are estimated as equivalent to two orders of magnitude higher energy than spark ignition [2]. Tarzhanov et al [13] investigated using hot detonation products to detonate stagnant propane-air mixtures and found that detonation initiation depends on the initial volume concentrations, mass fraction of hot detonation products, and the energy deposited from the detonation products. Mayinger et al [14] derived correlations between the induction time (ignition delay time), the mixing time of the jet, and the adiabatic autoignition time for the fuel-air mixtures.…”

Section: Introductionmentioning

confidence: 99%

Traversing Hot-Jet Ignition in a Constant-Volume Combustor

Karimi

Rajagopal

Nalim

2013

Volume 1B: Combustion, Fuels and Emissions

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Hot-jet ignition of a combustible mixture has application in internal combustion engines, detonation initiation, and wave rotor combustion. Numerical predictions are made for ignition of combustible mixtures using a traversing jet of chemically active gas at one end of a long constant-volume combustor (CVC) with an aspect ratio similar to a wave rotor channel. The CVC initially contains a stoichiometric mixture of ethylene or methane at atmospheric conditions. The traversing jet issues from a rotating prechamber that generates gaseous combustion products, assumed at chemical equilibrium for estimating major species. Turbulent combustion uses a hybrid eddy-breakup model with detailed finite-rate kinetics and a two-equation k-x model. The confined jet is observed to behave initially as a wall jet and later as a wall-impinging jet. The jet evolution, vortex structure, and mixing behavior are significantly different for traversing jets, stationary centered jets, and nearwall jets. Pressure waves in the CVC chamber affect ignition through flame vorticity generation and compression. The jet and ignition behavior are compared with high-speed video images from a prior experiment. Production of unstable intermediate species like C 2 H 4 and CH 3 appears to depend significantly on the initial jet location while relatively stable species like OH are less sensitive.

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Detonation of propane-air mixtures under injection of hot detonation products

Cited by 7 publications

References 14 publications

Effects of Heat and Momentum Gain Differentiation during Gas Detonation Spraying of FeAl Powder Particles into the Water

Effects of Heat and Momentum Gain Differentiation during Gas Detonation Spraying of FeAl Powder Particles into the Water

Ignition by Hot Transient Jets in Confined Mixtures of Gaseous Fuels and Air

Traversing Hot-Jet Ignition in a Constant-Volume Combustor

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