Scaling Analysis on Dynamic Flammability Limits of Unsteady Premixed Methane/Air Flames

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76992/1/AIAA-2007-382-839.pd

Extinction Limits of Premixed Combustion Assisted by Catalytic Reaction in a Stagnation-Point Flow

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76039/1/AIAA-2006-164-151.pd

Autoignition of a Hydrogen-Air Mixture with Temperature and Composition Inhomogeneities

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76675/1/AIAA-2009-1559-223.pd

Flame-Flow Interactions and Flow Reversal

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/83638/1/AIAA-2010-777-870.pd

Effects of Strain Rate Fluctuations on Auto-Ignition of Hydrogen/Air Mixture

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76210/1/AIAA-2008-1005-744.pd

Modeling of Fuel Vapor Jet Eruption Induced by Local Droplet Heating

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/140419/1/6.2014-1017.pd

Hydrogen double compression-expansion engine (H2DCEE): A sustainable internal combustion engine with 60%+ brake thermal efficiency potential at 45 bar BMEP

Hydrogen (H-2) internal combustion engines may represent cost-effective and quick solution to the issue of the road transport decarbonization. A major factor limiting their competitiveness relative to fuel cells (FC) is the lower efficiency. The present work aims to demonstrate the feasibility of a H-2 engine with FC-like 60%+ brake thermal efficiency (BTE) levels using a double compression-expansion engine (DCEE) concept combined with a high pressure direct injection (HPDI) nonpremixed H-2 combustion. Experimentally validated 3D CFD simulations are combined with 1D GT-Power simulations to make the predictions. Several modifications to the system design and operating conditions are systematically implemented and their effects are investigated. Addition of a catalytic burner in the combustor exhaust, insulation of the expander, dehumidification of the EGR, and removal of the intercooling yielded 1.5, 1.3, 0.8, and 0.5%-point BTE improvements, respectively. Raising the peak pressure to 300 bar via a larger compressor further improved the BTE by 1.8%-points but should be accompanied with a higher injector-cylinder differential pressure. The lambda of ~1.4 gave the optimum tradeoff between the mechanical and combustion efficiencies. A peak BTE of 60.3% is reported with H2DCEE, which is ~5%-points higher than the best diesel-fueled DCEE alternative

Effects of Scalar Dissipation Rate Fluctuations on Autoignition of Hydrogen/Air Mixture

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76071/1/AIAA-38665-294.pd