Translational nonequilibrium effects in shock waves in gases

Genich, A. P.; Kulikov, S. V.; Манелис, Г. Б.; Myagkov, Yu. P.; Chereshnev, S. L.

doi:10.1007/bf01049828

Cited by 4 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If the oligomerization of amino acids by impact shock is mainly controlled by heating at the peak-shocked state, the use of forsterite does not affect the formation of linear peptides as a catalyst. However, as discussed in the former paragraph, chemical reactions are known to be promoted at the shock front (e.g., Greene and Toennies, 1964;Genich et al, 1990;Kulikov, 1999;Velikodnyi and Kurochkin, 2002). Thus, a control experiment (shock experiment at 77 K, without forsterite) to examine the role of forsterite in the reaction at the shock front would be necessary in future research.…”

Section: Peptide Synthesis By Impact Shockmentioning

confidence: 99%

“…In this region, the particles are accelerated by the shock wave, causing the pressure and temperature of the material to increase dynamically. The particular effects caused by the non-equilibrium phenomena at the shock front are known to accelerate chemical reactions (e.g., Greene and Toennies, 1964;Genich et al, 1990;Kulikov, 1999;Velikodnyi and Kurochkin, 2002). The difference in the initial conditions (the phase of water and temperature) may have influenced the reaction at the shock front, which then could have caused the difference in the resulting peptides.…”

Section: Peptide Synthesis By Impact Shockmentioning

confidence: 99%

See 1 more Smart Citation

Glycine oligomerization up to triglycine by shock experiments simulating comet impacts

Sugahara

Mimura

2014

Geochem. J.

View full text Add to dashboard Cite

Section: Peptide Synthesis By Impact Shockmentioning

confidence: 99%

Section: Peptide Synthesis By Impact Shockmentioning

confidence: 99%

Glycine oligomerization up to triglycine by shock experiments simulating comet impacts

Sugahara

Mimura

2014

Geochem. J.

View full text Add to dashboard Cite

“…Ignition limits of the stoichiometric hydrogen-air mixture behind the incident shock wave obtained in the present work: ○, no ignition; •, there is ignition; 1) approximating curve; 2) Lewis and Elbe curve [1] of ignition in a spherical vessel; 3) and ∆, ignition limits behind the refl ected shock wave [13]. nonequilibrium in the incident shock wave front leading to high-energy collisions (on the scale of several collisions) can also initiate various threshold effects and, in particular, the ignition process [15,16].…”

mentioning

confidence: 99%

Measurement of Ignition Limits and Induction Times of Hydrogen–Air Mixtures Behind the Incident Shock Wave Front at Low Temperatures

Павлов

Gerasimov

2014

J Eng Phys Thermophy

View full text Add to dashboard Cite

We have made an experimental study of the ignition of a stoichiometric hydrogen-air mixture behind the incident shock wave front in a shock tube. The ignition limits and the induction times of the mixture behind the wave front in the range of temperatures T = 550-960 K and pressures P = 0.01-1.1 MPa have been determined. Much lower values of the ignition temperature compared to the experimental results obtained in refl ected shock waves, as well as to the classical Lewis and Elbe, have been registered. The measured induction times in the above temperature and pressure ranges are in good agreement with theoretical estimates.Introduction. The ignition limits of combustible gaseous mixtures are an important characteristic of combustion and detonation processes. Most of the classical experimental works on determining the above limits in hydrogen-air mixtures were carried out under the conditions when the gaseous mixture was practically in the state of rest or moving with a low velocity [1][2][3][4]. The corresponding theoretical calculations were oriented to these experiments [5,6]. At present, in connection with the works aimed at developing hypersonic passenger airplanes burning hydrogen fuel [7], the investigation of the ignition characteristics in supersonic hydrogen-air fl ows is of interest. Therefore, the supersonic character of the gaseous mixture fl ow behind the incident shock wave in the shock tube determines the attractiveness of using this tool in pertinent experiments connected with the practical realization of the combustion process in hypersonic fl ights.Most investigations of the process of ignition of hydrogen-air mixtures in shock tubes were conducted behind refl ected waves where the gas is stationary with respect to the walls of the shock tube [8][9][10][11][12][13]. The measurand thereby was the ignition induction time of the mixture. The aim of the present work is to determine the ignition limits and the induction times of hydrogen-air mixtures in incident shock waves and compare the obtained data with the results of experiments performed behind refl ected shock waves. As the results of the investigations have shown, the value of the induction time at low-temperature ignition of the mixture is determined by the time of propagation of the combustion zone from the boundary layer heated by the supersonic fl ow into the entire volume of the shock tube.Experimental. Experiments were performed on a shock tube with an internal radius r = 28.5 mm which consisted of a high-pressure chamber of length 1 m and a low-pressure chamber of length 4.5 mm separated by a diaphragm. When the diaphragm breaks, in the low-pressure chamber the shock wave compressing and heating the investigated gas propagates. In experiments, we used devices for recording emission spectra, measuring the shock wave velocity, and recording pressure profi les in the shock wave (Fig. 1). The gas-dynamic parameters in the shock wave front were calculated for each particular experiment with the use of the "Gaseq" program from the initial p...

show abstract

Shock-induced pyrolysis of amino acids at ultra high pressures ranged from 3.2 to 35.3GPa

Sugahara

Mimura

2014

Journal of Analytical and Applied Pyrolysis

View full text Add to dashboard Cite

Translational nonequilibrium effects in shock waves in gases

Cited by 4 publications

References 3 publications

Glycine oligomerization up to triglycine by shock experiments simulating comet impacts

Glycine oligomerization up to triglycine by shock experiments simulating comet impacts

Measurement of Ignition Limits and Induction Times of Hydrogen–Air Mixtures Behind the Incident Shock Wave Front at Low Temperatures

Shock-induced pyrolysis of amino acids at ultra high pressures ranged from 3.2 to 35.3GPa

Contact Info

Product

Resources

About