Gaseous hydrocarbonair detonations

Tieszen, Sheldon R.; Stamps, Douglas W.; Westbrook, Charles K.; Pitz, William J.

doi:10.1016/0010-2180(91)90013-2

Cited by 81 publications

(27 citation statements)

References 10 publications

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“…Bei Wasserstoff wird eine Abnahme mit zunehmender Temperatur beobachtet [23]. In einigen Fällen wird ein geringer Temperatureinfluss beschrieben [24].…”

Section: Ausschluss Von Explosionsausbreitung Im Inneren Von Mikrostrunclassified

Sicherheit in der Mikroreaktionstechnik

Gödde

Liebner

Hieronymus

2009

Chemie Ingenieur Technik

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“…Bei Wasserstoff wird eine Abnahme mit zunehmender Temperatur beobachtet [23]. In einigen Fällen wird ein geringer Temperatureinfluss beschrieben [24].…”

Section: Ausschluss Von Explosionsausbreitung Im Inneren Von Mikrostrunclassified

Sicherheit in der Mikroreaktionstechnik

Gödde

Liebner

Hieronymus

2009

Chemie Ingenieur Technik

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“…Cicarelli et al (1994) reported a cell width for hydrogen-air of 8.2 mm at 300 K and 8.8 m at 500 K. Considering the data for different temperatures by Cicarelli et al., the dependence of the cell width on temperature over a range of 100 • C is weak. This was also indicated by Tieszen et al (1991). Note that in the present paper, the mean cell size and its standard deviation for hexane-air were determined from two tests; 36 mm with a standard deviation of 7.6 mm for one test, and 45 mm with a standard deviation of 8.5 mm for the other.…”

Section: Detonationmentioning

confidence: 99%

“…It is unclear whether the reduction of the ignition delay of a hydrocarbon fuel is caused by the radical kinetics alone or by the nitrate decomposition and oxidation. Tieszen et al (1991) have performed extensive detonation experiments of vaporized liquid fuels in air in a heated detonation tube 0.43 m in diameter. Presles et al (1996) also recently conducted detonation experiments in vaporized nitromethane.…”

Section: Introductionmentioning

confidence: 99%

Effects of nitrates on hydrocarbon-air flames and detonations

Zhang¹,

Akbar

Thibault

et al. 2001

Shock Waves

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The subject of hydrocarbon sensitization by nitrates under conditions of a heterogeneous spray has been of interest due to its applicability in promoting ignition. To gain insight into the mechanisms of the nitrate sensitization effect, the present work was limited to vapour phase studies at elevated temperatures in order to avoid the influence of heterogeneous factors. The experiments performed included studies of flammability, flame propagation, shock ignition and detonation. The mixtures used were composed of air, hexane, and isopropyl nitrate (IPN) with IPN concentrations ranging from 0 to 100 mole % in hydrocarbon-IPN. In addition, methane and propane were also included in the flame experiments. For the shock ignition and detonation experiments, the measured ignition delay and detonation cell size had minimum values for IPN-air and maximum values for hexane-air. With increases in the IPN concentration, the ignition delay and detonation cell size fell monotonically between the values for hexane and IPN. This monotonic behaviour was explained to be the result of mixing the hydrocarbon with the more sensitive nitrate whose energetics are larger than or comparable to the hydrocarbon when mixed with air. For the slow combustion mode, the results also confirmed the monotonic behavior and showed that the lean flammability limit and the flame velocity fell between those of the hydrocarbon and IPN.

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“…Some works have been devoted to the influence of the initial temperature on detonation characteristics and limits in gaseous reactive mixtures [Pujol (1968), Stainnack (1968), Pawel et al (1969)]. Later, a limited number of studies concerning the effect of initial temperature on detonation cell size and critical detonation initiation energy have been motivated by safety reasons in operating nuclear power plants and in rocket propulsion [Vasil'ev et al (1979), Tieszen et al (1986), Tieszen and Stamps (1991), Zitoun (1992), Zitoun et al (1995), and Auffret et al (1998)]. …”

Section: Introductionmentioning

confidence: 99%

Detonation structure and detonability of C $_2$ H $_2$ -O $_2$ mixtures at elevated initial temperature

2001

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We have studied the influence of initial pressure (P0 = 0.05-1 bar) and temperature (T0 = 300-500 K) on the detonation structure of three acetylene-oxygen based mixtures. Two were stoichiometric, C2H2 + 2.5 O2 and C2H2 + 2.5 O2 + 3.5 Ar and one was lean, C2H2 + 10 O2. The gaseous mixtures were heated by the detonation tube itself which was electrically heated by Joule effect at a rate of about 100 K per minute. Experimental results show that the detonation cell size λ of the stoichiometric mixtures increases with T0 and is nearly independent of this parameter for the lean one. The evolution of the cell size with respect to the initial temperature and pressure is reasonably well predicted through the ZND model using global or detailed kinetics. Calculations show that the influence of T0 on cell size depends strongly on the value of the reduced global activation energy Ea/RTZND of the given mixture.The critical diameter dC of detonation transmission from a tube into a large volume and the critical radius of curvature RC of spherical detonation initiation have been studied using the two stoichiometric mixtures at elevated initial temperature. Results indicate that the classical relationships dC ∼ = 13λCJ and RC ∼ = 20λCJ hold also in these conditions. As a consequence, because of increasing λ with T0, the detonability of the stoichiometric mixtures drops at elevated temperature.

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Gaseous hydrocarbonair detonations

Cited by 81 publications

References 10 publications

Sicherheit in der Mikroreaktionstechnik

Sicherheit in der Mikroreaktionstechnik

Effects of nitrates on hydrocarbon-air flames and detonations

Detonation structure and detonability of C $_2$ H $_2$ -O $_2$ mixtures at elevated initial temperature

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