Performance and emissions of a pilot ignited direct injection natural gas engine operating at slightly premixed combustion mode

Article Energy & Fuels

Development of a skeletal combustion mechanism for natural gas engine using n-butanol-diesel blend as pilot fuel

Yuqiang Li et al.

Summary: Experimental results demonstrate that n-butanol-diesel blend as a pilot fuel can improve the performance and emissions of natural gas (NG) dual-fuel engine. A simplified HTBMEP mechanism was constructed with 513 reactions and 117 species for numerical simulation of n-butanol-diesel-NG combustion in engine, showing reliability through extensive validation. Further numerical study indicates that increasing NG substitution rate and n-butanol blend ratio affect combustion processes and emissions.

FUEL (2021)

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Article Chemistry, Applied

Experimental investigation on the combustion and emissions in a pilot ignited direct injection natural gas engine using HCDI strategy

Menghan Li et al.

Summary: The study found that the application of homogeneous charge direct injection strategy in pilot ignited direct injection natural gas engines may improve soot emissions but have negative effects on some emissions at low load conditions; at high load conditions, CO and soot emissions can be significantly improved and thermal efficiency increased with optimized injection parameters; however, the adoption of homogeneous charge direct injection strategies may lead to increased instabilities in engine operation.

FUEL PROCESSING TECHNOLOGY (2021)

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Article Energy & Fuels

Computational studies of fuel injection strategies on natural gas combustion characteristics in direct-injection engines

Kang Pan et al.

Summary: The study revealed that fuel injection duration, injector nozzle size, and injection angle can significantly impact natural gas combustion characteristics. Shorter injection duration reduces peak cylinder pressure and emissions, but insufficient injected fuel mass may lead to flame propagation failure. Injector nozzle size influences combustion type, with small nozzles inducing diffusion combustion and large nozzles inducing partially premixed combustion. Fuel injection angle affects combustion by modifying flame propagation from the glow plug shield.

FUEL (2021)

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Article Energy & Fuels

Hydrogen-Enriched Biogas Premixed Charge Combustion and Emissions in Direct Injection and Indirect Injection Diesel Dual Fueled Engines: A Comparative Study

Van Ga Bui et al.

Summary: This study compared the combustion and emissions performance of hydrogen-enriched biogas dual-fuel engines with two injection methods, finding that the IDIDF engine performs better in terms of engine work and emissions of CO, soot, and noise, but has higher NOx emissions.

JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME (2021)

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Review Green & Sustainable Science & Technology

Advances in combustion control for natural gas-diesel dual fuel compression ignition engines in automotive applications: A review

Carrie Hall et al.

Summary: Dual fuel engines using gaseous fuels have been around for over a century, but recent advances in fuel injection technologies and electronic control systems have revolutionized combustion control methods for automotive applications. Early efforts with natural gas in compression ignition engines relied on map-based methods, but the introduction of multi-pulse injection and electronic fuel injection capabilities has enabled new combustion strategies and necessitated more complex control methods. Novel approaches like reactivity controlled compression ignition and high pressure natural gas injection have improved efficiency and cleanliness, but also introduced more complex combustion phenomena.

RENEWABLE & SUSTAINABLE ENERGY REVIEWS (2021)

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Article Thermodynamics