All Publications


  • Measurement of time histories of stable intermediates during first stage ignition of n-heptane and its two isomers in a shock tube PROCEEDINGS OF THE COMBUSTION INSTITUTE Choudhary, R., Girard, J. J., Clees, S., Johnson, S. E., Shao, J., Davidson, D. F., Hanson, R. K., Aradi, A. A. 2021; 38 (1): 957-965
  • High-speed imaging of n-heptane ignition in a high-pressure shock tube PROCEEDINGS OF THE COMBUSTION INSTITUTE Shao, J., Choudhary, R., Susa, A. J., Davidson, D. F., Hanson, R. K. 2021; 38 (1): 911-918
  • Shock-induced ignition and pyrolysis of high-pressure methane and natural gas mixtures COMBUSTION AND FLAME Shao, J., Ferris, A. M., Choudhary, R., Cassady, S. J., Davidson, D. F., Hanson, R. K. 2020; 221: 364–70
  • A physics-based approach to modeling real-fuel combustion chemistry - VI. Predictive kinetic models of gasoline fuels COMBUSTION AND FLAME Xu, R., Saggese, C., Lawson, R., Movaghar, A., Parise, T., Shao, J., Choudhary, R., Park, J., Lu, T., Hanson, R. K., Davidson, D. F., Egolfopoulos, F. N., Aradi, A., Prakash, A., Mohan, V., Cracknell, R., Wang, H. 2020; 220: 475–87
  • The pyrolysis of propane INTERNATIONAL JOURNAL OF CHEMICAL KINETICS Cassady, S. J., Choudhary, R., Boddapati, V., Pinkowski, N. H., Davidson, D. F., Hanson, R. K. 2020

    View details for DOI 10.1002/kin.21395

    View details for Web of Science ID 000540365200001

  • The Thermal Decomposition of Ethane Fuel Cassady, S. J., Choudhary, R., Pinkowski, N. H., Shao, J., Davidson, D. F., Hanson, R. K. 2020
  • Shock Tube Measurement of the CH3 + C2H6 CH4 + C2H5 Rate Constant. The journal of physical chemistry. A Shao, J., Wei, W., Choudhary, R., Davidson, D. F., Hanson, R. K. 2019

    Abstract

    The rate constant for the CH3 + C2H6 CH4 + C2H5 reaction was studied behind reflected shock waves at temperatures between 1369 and 1626 K and pressures from 8.6 to 47.4 atm in mixtures of methane, ethane, and argon. Ethylene time histories were measured using laser absorption of radiation from a carbon dioxide gas laser near 10.532 mum. The resulting rate constant data can be represented by the Arrhenius equation k (T) = 3.90 * 1013 exp(-16670 cal/mol/RT) cm3 mol-1 s-1. We believe this is the first study to extend experimental data for this rate constant to temperatures above 1400 K. The overall 2sigma uncertainty of the current data is +18%/-21% resulting primarily from uncertainties associated with the influence of secondary reactions and the fitting of rapidly changing species time histories at the higher temperatures.

    View details for DOI 10.1021/acs.jpca.9b07691

    View details for PubMedID 31557027

  • A shock tube study of n-heptane, iso-octane, n-dodecane and iso-octane/n-dodecane blends oxidation at elevated pressures and intermediate temperatures FUEL Shao, J., Choudhary, R., Peng, Y., Davidson, D. F., Hanson, R. K. 2019; 243: 541–53
  • Measurement of the reaction rate of H + O-2 + M -> HO2 + M, for M=Ar, N-2, CO2, at high temperature with a sensitive OH absorption diagnostic COMBUSTION AND FLAME Choudhary, R., Girard, J. J., Peng, Y., Shao, J., Davidson, D. F., Hanson, R. K. 2019; 203: 265–78
  • Shock Tube Measurement of the C2H4 + H double left right arrow C2H3 + H-2 Rate Constant JOURNAL OF PHYSICAL CHEMISTRY A Shao, J., Choudhary, R., Peng, Y., Davidson, D. F., Hanson, R. K. 2019; 123 (1): 15–20

    Abstract

    The rate constant for the reaction C2H4+H⇒C2H3+H2 was studied behind reflected shock waves at temperatures between 1619 and 1948 K and pressures near 10 atm in a mixture of C2H4, CH4, H2, and argon. C2H4 time-histories were measured using laser absorption of a CO2 gas laser near 10.53 microns. Experimental mixtures were designed to optimize sensitivity to the title reaction with only weak sensitivity to secondary reactions. Two mechanisms, FFCM1 and ARAMCO v2, are used for data analysis. The well-selected operating conditions and Monte-Carlo Sampling data analysis procedure resulted in mechanism independent reaction rate constant measurements with 2σ uncertainty of +/-35 %. The current data disagree with a broadly used theoretical calculation (Knyazev et al. (1996)), but they are in good consensus with one of the review studies (Baulch et al. (2005)), k=3.9×1022T3.62exp(-5670/T) cm3molecule-1s-1. To the best of our knowledge, this work provides the first high temperature study of C2H4+H⇒C2H3+H2 reaction rate constant with well-defined uncertainty.

    View details for PubMedID 30537818

  • Shock tube study of the rate constants for H +O-2 + M -> HO2 +M (M = Ar, H2O, CO2, N-2) at elevated pressures PROCEEDINGS OF THE COMBUSTION INSTITUTE Shao, J., Choudhary, R., Susa, A., Davidson, D. F., Hanson, R. K. 2019; 37 (1): 145–52
  • Ignition delay times of methane and hydrogen highly diluted in carbon dioxide at high pressures up to 300 atm PROCEEDINGS OF THE COMBUSTION INSTITUTE Shao, J., Choudhary, R., Davidson, D. E., Hanson, R. K., Barak, S., Vasu, S. 2019; 37 (4): 4555–62
  • Demonstration of non-absorbing interference rejection using wavelength modulation spectroscopy in high-pressure shock tubes APPLIED PHYSICS B-LASERS AND OPTICS Wei, W., Peng, W., Wang, Y., Choudhary, R., Wang, S., Shao, J., Hanson, R. K. 2019; 125 (1)