Contact

  • Academic
    gibsonc@stanford.edu
    University - Student Department: Mechanical Engineering Position: Graduate
    University - Student Department: Mechanical Engineering Position: Graduate

Additional Info

All Publications

  • Carbon black and hydrogen production from methane pyrolysis: Measured and modeled insights from integrated gas and particle diagnostics in shock tubes CARBON Clark, G., Adib, M., Li, C., Rault, T. M., Streicher, J. W., Dames, E., Kholghy, M., Hanson, R. K. 2026; 260

    View details for DOI 10.1016/j.carbon.2026.121902

    View details for Web of Science ID 001842482100001

  • Carbon particle formation, nanostructure and morphology in H2-blended CH4 pyrolysis: Shock tube experiments and modeling PROCEEDINGS OF THE COMBUSTION INSTITUTE Clark, G., Li, C., Adib, M., Jahanzamin, J., Streicher, J. W., Dames, E., Dasappa, S., Boies, M. M., Kholghy, R., Hanson, R. K. 2026; 42

    View details for DOI 10.1016/j.proci.2026.106301

    View details for Web of Science ID 001840765900001

  • Optical characterization of stratified-premixed natural gas direct-injection combustion regimes INTERNATIONAL JOURNAL OF ENGINE RESEARCH Rochussen, J., Knight, M., Clark, G., Kirchen, P. 2022: 1892-1915

    Abstract

    Gaseous fuels for heavy-duty internal combustion engines provide inherent advantages for reducing CO2, particulate matter (PM), and NOX emissions. Pilot-ignited direct-injected NG (PIDING) combustion uses a small pilot injection of diesel to ignite a late-cycle main direct injection of NG, resulting in significant reduction of unburned CH4 emissions relative to port-injected NG. Previous works have identified NG premixing as a critical parameter establishing indicated efficiency and emissions performance. To this end, a recent experimental investigation using a metal engine identified six general regimes of PIDING heat release and emissions behavior arising from variation of NG stratification through control of relative injection timing (RIT) of the NG with respect to the pilot diesel. The objective of the current work is to provide comprehensive description of in-cylinder fuel mixing of direct injected gaseous fuel and its impacts on combustion and pollutant formation processes for stratified PIDING combustion. In-cylinder imaging of OH*-chemiluminescence (OH*-CL) and PM (700 nm), and measurement of local concentration of fuel is considered for 11 different RIT , representing 5 regimes of stratified PIDING combustion (performed with P inj = 22 . 0 MPa and ϕ = 0 . 63 ). The magnitude and cyclic variability of premixed fuel concentration near the bowl wall provides direct experimental validation of thermodynamic metrics ( RI T premix , SO I NG , trans , RI T * ) that describe the fuel-air mixture state of all 5 regimes of PIDING combustion. The local fuel concentration develops non-monotonically and is a function of RIT. High indicated efficiency and low CH4 emissions previously observed for stratified-premixed PIDING combustion in previous (non-optical) investigations are due to: (i) very rapid reaction zone growth ( > 45 m/s) and (ii) more distributed early reaction zones when overlapping pilot and NG injections cause partial pilot quenching. These results connect and extend the findings of previous investigations and guide the future strategic implementation of NG stratification for improved combustion and emissions performance.

    View details for DOI 10.1177/14680874221107188

    View details for Web of Science ID 000822212500001

    View details for PubMedID 37096028

    View details for PubMedCentralID PMC10119904

https://orcid.org/0000-0002-5033-0919