Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters J. Energy Resour. Technol. 2014;136(2): doi: / Injection duration setting for various (a) hydrogen fractions and (b) diluent fractions as a function of equivalence ratio Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters J. Energy Resour. Technol. 2014;136(2): doi: / Methane distribution around the spark discharge location at two different spark delay times (a) T sd = 1 ms and (b) T sd = 5 ms at equivalence ratio of 0.6 Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters J. Energy Resour. Technol. 2014;136(2): doi: / Effect of injection pressure on peak pressure and maximum rate of pressure rise at chamber pressure of 1 bar, chamber temperature of 298 K and spark delay time of 1 ms for equivalence ratios of 0.6, 0.8 and 1.0 Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters J. Energy Resour. Technol. 2014;136(2): doi: / Effect of injection pressure on initial combustion duration at different spark delay times at chamber pressure of 1 bar and chamber temperature of 298 K for equivalence ratios of 1.0 and 0.6 Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters J. Energy Resour. Technol. 2014;136(2): doi: / Effect of chamber temperature and chamber pressure on peak pressure at injection pressure of 90 bar, spark delay time of 1 ms and equivalence ratios of 0.6, 0.8, and 1.0 Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters J. Energy Resour. Technol. 2014;136(2): doi: / Effect of chamber temperature and chamber pressure on maximum rate of pressure rise at injection pressure of 90 bar, spark delay time of 1 ms and equivalence ratios of 0.6, 0.8, and 1.0 Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters J. Energy Resour. Technol. 2014;136(2): doi: / Effect of chamber temperature and chamber pressure on main combustion duration at injection pressure of 90 bar, spark delay time of 1 ms and equivalence ratios of 0.6, 0.8, and 1.0 Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters J. Energy Resour. Technol. 2014;136(2): doi: / Effect of hydrogen addition on flame propagating process at four different times after spark ignition (1.0, 2.4, 3.9, and 5.4 ms), injection pressure of 90 bar, spark delay time of 1 ms and equivalence ratio of 0.8 Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters J. Energy Resour. Technol. 2014;136(2): doi: / Effect of hydrogen addition on peak pressure and maximum rate of pressure rise at injection pressure of 90 bar, chamber pressure of 1 bar, chamber temperature of 298 K and spark delay time of 1 ms for equivalence ratios of 0.6, 0.8, and 1.0 Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters J. Energy Resour. Technol. 2014;136(2): doi: / Effect of hydrogen addition on main combustion duration and NOx concentration at injection pressure of 90 bar, chamber pressure of 1 bar, chamber temperature of 298 K and spark delay time of 1 ms for equivalence ratios of 0.6, 0.8, and 1.0 Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters J. Energy Resour. Technol. 2014;136(2): doi: / Effect of diluent addition on peak pressure at injection pressure of 90 bar, chamber pressure of 1 bar, chamber temperature of 298 K and equivalence ratios of 0.6, 0.8, and 1.0 for different spark delay times Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters J. Energy Resour. Technol. 2014;136(2): doi: / Snapshots of combustion instability as a function of time after spark in diluent fraction of 25%, spark delay time of 40 ms and equivalence ratio of 1.0 Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters J. Energy Resour. Technol. 2014;136(2): doi: / Effect of diluent addition on maximum rate of pressure rise, main combustion duration and NOx concentration at injection pressure of 90 bar, chamber pressure of 1 bar, chamber temperature of 298 K and spark delay time of 110 ms for equivalence ratios of 0.6, 0.8, and 1.0 Figure Legend: