4.7 Article

Effect of hydrogen direct injection strategies and ignition timing on hydrogen diffusion, energy distributions and NOx emissions from an opposed rotary piston engine

Related references

Note: Only part of the references are listed.
Article Thermodynamics

Effects of split direct-injected hydrogen strategies on combustion and emissions performance of a small-scale rotary engine

Cheng Shi et al.

Summary: Split direct-injected hydrogen is beneficial for mixture stratification; Enhanced combustion can be achieved by increasing post-injection mass fraction and optimizing dwell time; Substantially improved engine performance with wider second injection pulse.

ENERGY (2021)

Article Energy & Fuels

Numerical simulation on the combustion and NOx emission characteristics of a turbocharged opposed rotary piston engine fuelled with hydrogen under wide open throttle conditions

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

Effects of equivalence ratio and blending ratio on the ignition delays of n-pentane/hydrogen mixtures under engine relevant pressure

Xue Jiang et al.

Summary: The study found that the ignition delay times of n-pentane/hydrogen mixtures are affected by equivalence ratio under the current conditions, and the chemistry interaction between the two fuels shows that hydrogen reacts independently from n-pentane. Additionally, hydrogen mainly supplies H radicals for H-abstraction reactions of n-pentane after blending, and the oxidation chemistry of hydrogen is inhibited after blending.
Article Energy & Fuels

Three-dimensional numerical simulations on the effect of ignition timing on combustion characteristics, nitrogen oxides emissions, and energy loss of a hydrogen fuelled opposed rotary piston engine over wide open throttle conditions

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 Chemistry, Physical

Explorations of the impacts on a hydrogen fuelled opposed rotary piston engine performance by ignition timing under part load conditions

Jianbing Gao et al.

Summary: The study investigated the performance of an ORP engine fueled with hydrogen under different ignition timing conditions, showing that late ignition significantly reduced peak in-cylinder pressure and heat release rates were more sensitive to late ignition. Ignition timing had limited impacts on pressure and power, while early ignition increased nitrogen oxides emission factors.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2021)

Article Green & Sustainable Science & Technology

Numerical simulation on lean-burn characteristics of a naturally aspirated opposed rotary piston engine fuelled with hydrogen at wide open throttle conditions

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

Simulation of the impacts on a direct hydrogen injection opposed rotary piston engine performance by the injection strategies and equivalence ratios

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.

RENEWABLE ENERGY (2021)

Article Thermodynamics

Performance explorations of a naturally aspirated opposed rotary piston engine fuelled with hydrogen under part load and stoichiometric conditions using a numerical simulation approach

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.

ENERGY (2021)

Article Energy & Fuels

Experimental and numerical study of combustion and emissions performance in a hydrogen-enriched Wankel engine at stoichiometric and lean operations

Cheng Shi et al.

Summary: Based on experimental and numerical simulations, the addition of hydrogen in a retrofitted Wankel engine was found to increase combustion temperature and pressure, optimizing combustion processes and improving engine stability. However, it also led to increased nitrogen oxide emissions, which could be mitigated by diluting the mixture.
Article Green & Sustainable Science & Technology

Intake characteristics and pumping loss in the intake stroke of a novel small scale opposed rotary piston engine

Jianbing Gao et al.

JOURNAL OF CLEANER PRODUCTION (2020)

Article Energy & Fuels

Internal combustion engine efficiency enhancer by using hydrogen

I. Vinoth Kanna et al.

INTERNATIONAL JOURNAL OF AMBIENT ENERGY (2020)

Review Engineering, Mechanical

Developments in tyre design for lower rolling resistance: A state of the art review

Hamad Sarhan Aldhufairi et al.

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING (2018)

Article Engineering, Mechanical

Knock induced erosion on Al pistons: Examination of damage morphology and its causes

E. Balducci et al.

ENGINEERING FAILURE ANALYSIS (2018)

Article Materials Science, Multidisciplinary

Experimental observations of engine piston damage induced by knocking combustion

Lorella Ceschini et al.

MATERIALS & DESIGN (2017)

Article Thermodynamics

Study on cold start characteristics of dual fuel SI engine with hydrogen direct-injection

Haiming Wu et al.

APPLIED THERMAL ENGINEERING (2016)

Review Green & Sustainable Science & Technology

A review of the effect of hydrogen addition on the performance and emissions of the compression - Ignition engine

Hayder A. Alrazen et al.

RENEWABLE & SUSTAINABLE ENERGY REVIEWS (2016)

Article Thermodynamics

A technical and environmental comparison between hydrogen and some fossil fuels

Giovanni Nicoletti et al.

ENERGY CONVERSION AND MANAGEMENT (2015)

Article Chemistry, Applied

Combustion, performance and emission characteristics of fusel oil in a spark ignition engine

Hamit Solmaz

FUEL PROCESSING TECHNOLOGY (2015)

Article Green & Sustainable Science & Technology

Effect of hydrogen addition to CNG in a biodiesel-operated dual-fuel engine

N. R. Banapurmath et al.

INTERNATIONAL JOURNAL OF SUSTAINABLE ENGINEERING (2015)

Article Transportation Science & Technology

Engine Knock in an SI Engine with Hydrogen Supplementation under Stoichiometric and Lean Conditions

Yu Chen et al.

SAE INTERNATIONAL JOURNAL OF ENGINES (2014)

Review Thermodynamics

Hydrogen-fueled internal combustion engines

Sebastian Verhelst et al.

PROGRESS IN ENERGY AND COMBUSTION SCIENCE (2009)