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In order to understand the combustion stability of a methane (CH4)/oxygen (O2) bipropellant as a next-generation rocket liquid propellant, the combustion stability limits and morphology of gaseous CH4/O2 (GCH4/GO2) coaxial jet flames, among various phases, in a single-element combustor are experimentally studied compared with the gaseous hydrogen/O2 (GH2/GO2) coaxial jet flames. Only the stably attached...
This study was devoted to investigating the energy utilization of a thermoelectric generator (TEG). Key factors governing the power generation characteristics of the TEG—the power output, system resistance, and conversion efficiency—are systematically analyzed under various engine operating conditions. The effects of heat rejection conditions on the energy utilization by the TEG are also examined...
The combustion and emission characteristics of a stratified lean-burn liquefied petroleum gas (LPG) direct-injection engine are investigated at five representative engine operating points, where passenger vehicles are most frequently operated. A redesigned engine head that makes room for an injection and ignition assembly, comprised of a center-mounted fuel injector and a spark plug positioned in...
In order to evaluate the potential of oxy-combustion of inverse nonpremixed coflow flames using a clean fuel to improve the combustion and emission characteristics compared with the normal coflow flames using air, the fundamental properties of inverse nonpremixed pure oxygen (O2)/methane (CH4) coflow flames in a model combustor are experimentally investigated. The combustion stability (extinction)...
WPO (Wood pyrolysis oil) has the potential to replace a considerable volume of conventional fossil fuels. However, the application of WPO in a diesel engine is constrained because of its poor properties, including a low cetane number, high water content, and high viscosity. In this study, two strategies are adopted to facilitate the use of WPO in a compression ignition engine. First, the properties...
Power and hydrogen (H2) production by burning and reforming ammonia (NH3) in a micro-TPV (microscale-thermophotovoltaic) device integrated with a micro-reformer is studied experimentally. A heat-recirculating micro-emitter with the cyclone and helical adapters that enhance the residence time of fed fuel-air mixtures and uniform burning burns H2-added NH3-air mixtures. A micro-reformer that converts...
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