Shock tube measurements of branched alkane ignition times and OH concentration time histories

2003 ◽  
Vol 36 (2) ◽  
pp. 67-78 ◽  
Author(s):  
M. A. Oehlschlaeger ◽  
D. F. Davidson ◽  
J. T. Herbon ◽  
R. K. Hanson
Keyword(s):  
Shock Tube ◽  
Concentration Time ◽  
Time Histories ◽  
Ignition Times

Shock tube measurements of iso-octane ignition times and OH concentration time histories

2002 ◽  
Vol 29 (1) ◽  
pp. 1295-1301 ◽  
Author(s):  
D.F. Davidson ◽  
M.A. Oehlschlaeger ◽  
J.T. Herbon ◽  
R.K. Hanson
Keyword(s):  
Shock Tube ◽  
Concentration Time ◽  
Time Histories ◽  
Ignition Times

Shock Tube Measurements Of Iso-Octane Ignition Times And OH Concentration Time Histories

2002 ◽  
Author(s):  
D. F. Davidson ◽  
M. A. Oehlschiaeger ◽  
J. T. Herbon ◽  
R. K. Hanson
Keyword(s):  
Shock Tube ◽  
Concentration Time ◽  
Time Histories ◽  
Ignition Times

Time-Resolved Measurements of Intermediate Concentrations in Fuel-Rich n-Heptane Oxidation Behind Reflected Shock Waves

2017 ◽  
Author(s):  
Zachary E. Loparo ◽  
Joseph G. Lopez ◽  
Sneha Neupane ◽  
Subith S. Vasu ◽  
William P. Partridge ◽  
...  
Keyword(s):  
Shock Waves ◽  
Shock Tube ◽  
Chemical Kinetics ◽  
Continuous Wave ◽  
Time Resolved ◽  
Ethylene Concentration ◽  
Reflected Shock ◽  
Concentration Time ◽  
Time Histories ◽  
Kinetics Of

The chemical kinetics of the oxidation of n-heptane (C7H16) — an important reference compound for real fuels — are well studied at stoichiometric and lean conditions. However, there is only limited information on the chemical kinetics of fuel-rich combustion. In order to improve the accuracy of chemical kinetic models at these conditions, the oxidation of rich n-heptane mixtures has been investigated. Combustion of n-C7H16/O2/Ar mixtures at equivalence ratios, ϕ, of 2.0 behind reflected shock waves has been studied at temperatures ranging from 1075 to 1418K and at pressures ranging from 1.6 to 1.9atm. Reaction progress was monitored by recording ethylene (C2H4) concentration time-histories and initial n-heptane decay rates at a location 2cm from the endwall of a 13.4m long, 14cm inner diameter shock tube. Ethylene and n-heptane concentration time-histories were measured using absorption spectroscopy at 10.532μm from a tunable CO2 laser and at around 3.4μm from a continuous wave distributed feedback interband cascade laser (ICL), respectively. The measured concentration time-histories were compared with modeled predictions from the Lawrence Livermore National Lab (LLNL) detailed n-heptane reaction mechanism. To the best of our knowledge, the current data are the first time-resolved n-heptane and ethylene concentration measurements conducted in a shock tube at these conditions.

Shock waves in microchannels

2013 ◽  
Vol 724 ◽  
pp. 259-283 ◽  
Author(s):  
G. Mirshekari ◽  
M. Brouillette ◽  
J. Giordano ◽  
C. Hébert ◽  
J.-D. Parisse ◽  
...  
Keyword(s):  
Shock Wave ◽  
Shock Tube ◽  
Large Scale ◽  
Numerical Models ◽  
Incident Shock ◽  
Incident Shock Wave ◽  
Navier Stokes ◽  
Shock Attenuation ◽  
Pressure Time ◽  
Time Histories

AbstractA fully instrumented microscale shock tube, believed to be the smallest to date, has been fabricated and tested. This facility is used to study the transmission of a shock wave, produced in a large (37 mm) shock tube, into a 34 $\mathrm{\mu} \mathrm{m} $ hydraulic diameter and 2 mm long microchannel. Pressure microsensors of a novel design, with gigahertz bandwidth, are used to obtain pressure–time histories of the microchannel shock wave at five axial stations. In all cases the transmitted shock wave is found to be weaker than the incident shock wave, and is observed to decay both in pressure and velocity as it propagates down the microchannel. These results are compared with various analytical and numerical models, and the best agreement is obtained with a Navier–Stokes computational fluid dynamics computation, which assumes a no-slip isothermal wall boundary condition; good agreement is also obtained with a simple shock tube laminar boundary layer model. It is also found that the flow developing within the microchannel is highly dependent on conditions at the microchannel entrance, which control the mass flux entering into the device. Regardless of the micrometre dimensions of the present facility, shock wave propagation in a microchannel of that scale exhibits a behaviour similar to that observed in large-scale facilities operated at low pressures, and the shock attenuation can be explained in terms of accepted laminar boundary models.

scholarly journals Shock tube ignition delay times and methane time-histories measurements during excess CO2 diluted oxy-methane combustion

2016 ◽  
Vol 164 ◽  
pp. 152-163 ◽  
Author(s):  
Batikan Koroglu ◽  
Owen M. Pryor ◽  
Joseph Lopez ◽  
Leigh Nash ◽  
Subith S. Vasu
Keyword(s):  
Shock Tube ◽  
Ignition Delay ◽  
Methane Combustion ◽  
Ignition Delay Times ◽  
Delay Times ◽  
Time Histories
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