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Review
Energy & Fuels
Jianbing Gao et al.
Summary: Hydrogen-fueled internal combustion engines offer zero carbon emissions and excellent combustion characteristics, but the occurrence of backfire in port hydrogen injection engines can limit engine performance improvement, requiring effective control strategies. Backfire control strategies have specific application conditions to ensure their effectiveness and prevent negative impacts.
Article
Thermodynamics
Jayashish Kumar Pandey et al.
Summary: This study experimentally investigated the effects of hydrogen-assisted combustion of an equivolume blend of ethanol/butanol (ENBOL) under different compression ratios, ignition timing, and hydrogen fractions. The results showed that increasing the compression ratio and hydrogen addition improved combustion performance but reduced volumetric efficiency. Retarding ignition timing improved brake power and brake thermal efficiency but resulted in lower peak pressure and heat release rate, as well as increased CO and UBHC emissions.
Article
Energy & Fuels
Huaiyu Wang et al.
Summary: This study investigates the effects of intake port closing (IPC) timing and exhaust port opening (EPO) timing on the performance and emissions of a hydrogen Wankel rotary engine (WRE) using a one-dimensional model. The simulation results show that leakage and crevice reduce the indicated mean effective pressure, while crevice has a smaller impact on volumetric efficiency compared to leakage. Advancing the IPC increases in-cylinder mass and indicated mean effective pressure, but also leads to higher relative NOx emissions. In contrast, the effects of EPO timing on performance and emissions are reversed.
Article
Green & Sustainable Science & Technology
Jianbing Gao et al.
Summary: Hydrogen internal combustion engines are gaining attention for their zero carbon dioxide emission and high thermal efficiency. This study investigated the combustion characteristics of a small-scale opposed rotary piston engine with different compression ratios using numerical simulation. The results showed that increasing the compression ratio improved the maximum in-cylinder pressure and indicated thermal efficiency, but also increased nitrogen oxide emissions.
Article
Energy & Fuels
Ling-zhi Bao et al.
Summary: This study focuses on achieving near-zero NOx emission with a large power and high thermal efficiency in a 2.0 L turbocharged direct-injection engine. By investigating the effects of variables such as excess air coefficient, start of injection timing, and injection pressure, the researchers were able to optimize the engine parameters and achieve the desired emission levels without the need for posttreatment equipment.
Article
Energy & Fuels
Cheng Shi et al.
Summary: The effects of turbulence-induced blade (TIB) configuration on ignition, combustion process, and emission performance in rotary engines were investigated using numerical simulations. The results show that introducing TIB improves turbulent flow, with the leading-blade rotor chamber exhibiting better combustion and emission characteristics. The TIB configuration has a greater impact on combustion improvement in pure gasoline engines.
Article
Thermodynamics
Hao Meng et al.
Summary: This study focuses on the experimental research of the combustion velocity of a hydrogen-fueled Wankel rotary engine and proposes a measurement method using dual spark plugs. The study found that using dual spark plugs can reduce the negative impact of flame propagation against the flow field. The combustion velocity of the engine is affected by the excess air ratio and engine speed, and the flame velocity and flow velocity both have a positive correlation with the knock level of the engine.
Article
Thermodynamics
Jianbing Gao et al.
Summary: A opposed rotary piston expander was proposed for small-scale ORC systems to recover waste heat energy from internal combustion engines of on-road vehicles. The expander had similar evolutions of cylinder volume, fluid mass, in-cylinder pressure, and temperature during operation; however, high rotation speed led to reductions in in-cylinder pressure, volumetric efficiency, and adiabatic efficiency compared to low speed operation.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Jianbing Gao et al.
Summary: The study found that hydrogen distribution in the combustion chambers was most uneven at a start of injection of -68.2 degrees crank angle (CA) after top dead centre (aTDC) among three injection strategies; meanwhile, it showed the lowest combustion efficiency, below 98.5%. The peak in-cylinder pressure ranged from 40 bar to 83 bar for the given scenarios. Combustion durations were between 20 degrees CA to 30 degrees CA, with ignition timing ranging from -20.85 degrees CA aTDC to -11.06 degrees CA aTDC.
Article
Energy & Fuels
Anas Rao et al.
Summary: The main pollution source of petrochemical products can be controlled by the implementation of hydrogen fuel in the transportation sector. Experiments on gas engines with different hydrogen percentages, EGR rates, and spark timings have been conducted to analyze the performance and emissions of compressed natural gas engines under various conditions. The analysis shows that optimal mixtures of hydrogen fractions and EGR ratios can be determined for different load conditions.
Article
Energy & Fuels
Jianbing Gao et al.
Summary: Hybrid vehicles are gaining attention due to environmental concerns, and Opposed Rotary Piston (ORP) engines are seen as a promising power source for these vehicles. Research on a turbocharged ORP engine fueled with hydrogen revealed high volumetric efficiency and excellent torque characteristics, with a maximum indicated power density significantly higher than turbocharged four-stroke reciprocating engines fueled with gasoline.
Article
Energy & Fuels
Jianbing Gao et al.
Summary: Ignition timing has a significant impact on engine performance, with early ignition resulting in increased fuel consumption and nitrogen oxides emissions, while late ignition leads to a higher percentage of exhaust energy in fuel chemical energy.
Article
Green & Sustainable Science & Technology
Jianbing Gao et al.
Summary: Opposed rotary piston engines have high power density and can be used as an ideal power source for hybrid vehicles and range extended electric vehicles. Hydrogen applications can demonstrate the advantages of these engines but worsen nitrogen oxides emissions. Lean-burn was adopted in this investigation to achieve low nitrogen oxides emissions, with results showing that engine speed of 3000 r/min had the highest in-cylinder pressure during combustion and significant increase in heat loss rates through cylinder walls with engine speed.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Jianbing Gao et al.
Summary: By studying various hydrogen direct injection strategies, it was found that hydrogen was unevenly distributed in the combustion chambers at high equivalence ratios, leading to low combustion efficiency; the maximum in-cylinder pressure exceeded 8.0 MPa under the equivalence ratio of 0.961, with corresponding heat release rates exceeding 45 J.(degrees CA)(-1); the indicated thermal efficiency was over 38% and increased generally by lowering equivalence ratios, with the maximum efficiency being approximately 42.5%; NOx emission factors reached the maximum value of approximately 35 g (kW h)(-1) under the equivalence ratio of 0.673 conditions; knock tendency was continuously decreased by lowering equivalence ratios.
Article
Thermodynamics
Jianbing Gao et al.
Summary: The study on combustion and nitrogen oxides emission of ORP engines under part load and stoichiometric conditions showed that hydrogen fuel applications can fully demonstrate its advantages, with higher indicated thermal efficiency and significant increase under high intake manifold pressure.
Article
Thermodynamics
Jianbing Gao et al.
Article
Thermodynamics
Xiongbo Duan et al.
Article
Thermodynamics
Jianbing Gao et al.
ENERGY CONVERSION AND MANAGEMENT
(2019)
Article
Thermodynamics
Yasin Sohret et al.
Article
Energy & Fuels
Changming Gong et al.
Article
Thermodynamics
Qing-he Luo et al.
ENERGY CONVERSION AND MANAGEMENT
(2018)
Article
Energy & Fuels
Jun Li et al.
