Experimental and numerical investigations of charge motion and combustion in lean-burn natural gas engines

The following paper presents thermodynamic and optical investigations of the natural flame and OH radical chemiluminescence of a hydrogen enriched methane combustion compared to natural gas combustion. The engine under investigation is a port-fueled unscavenged prechamber 4.8 L single cylinder large bore engine. The blends under consideration are 2%V, 5%V,10%V, and 40%V of hydrogen expected to be blended within existing natural gas grids in a short and mid-term timeline in order to store green energy from solar and wind. These fuel blends could be used for stabilization of the energy supply by reconverting the renewable fuel CH4/H2 in combined heat and power plants. As expected, admixture of hydrogen extends the ignition limits of the fuel mixture toward lean ranges up to an air-fuel equivalence ratio of almost 2. No negative effect on combustion is observed up to an admixture of 40%V hydrogen. At 40%V hydrogen, abnormal combustion like backfire occurs at an air-fuel equivalence ratio of 1.5. The higher mixtures exhibit increased nitrogen oxide emissions due to higher combustion chamber temperatures, while methane slip and CO emissions are reduced due to more complete combustion. The optical investigation of the natural flame and OH radical chemiluminescence are in good agreement with the thermodynamic results verifying the more intense combustion of the fuel blends by means of the chemiluminescence intensity. Further, lube oil combustion and a continuing luminescence after the thermodynamic end of combustion are observed.

show abstract

“…Literature review of HCNG fueled engines, 4,13–41 bars indicate an estimation as no value was indicated in the source.…”

Section: Effects Of Hydrogen Blends On Combustion: a Brief Literature...mentioning

confidence: 99%

Optical and thermodynamic investigations of a methane and hydrogen blend fueled large bore engine

Karmann

Eicheldinger

Prager

et al. 2022

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…Experimental studies based on optical measurements reveal details of the incylinder combustion process. Korb et al [72] conducted optical measurements of averaged flame probability distribution in a natural gas engine, and the investigated cases consisted of two nozzle orientations (A: radical, B: tilted), two different equivalence ratios in the main chamber (λ), and two different fuel flows in the prechamber (mf), they were compared at a sequence of crank angles, as shown in Fig. 8.…”

Section: Ignition and Flame Developmentmentioning

confidence: 99%

A review of the pre-chamber ignition system applied on future low-carbon spark ignition engines

Zhu

Akehurst

Yuan

2022

Renewable and Sustainable Energy Reviews

101

View full text Add to dashboard Cite

“…The results show that propane can accelerate the combustion rate, expand the lean burn limit and reduce emissions. Korb et al 31 studied the influence of nozzle structure parameters on the prechamber. The straight hole can improve the turbulent kinetic energy, and the inclined hole can improve the oil-gas mixing.…”

Section: Introductionmentioning

confidence: 99%

Economy and emission characteristics of the optimal dilution strategy in lean combustion based on GDI gasoline engine equipped with prechamber

Wang

Huang

Wang

et al. 2021

Advances in Mechanical Engineering

View full text Add to dashboard Cite

EGR and excess-air dilution have been investigated in a 1.5 L four cylinders gasoline direct injection (GDI) turbocharged engine equipped with prechamber. The influences of the two different dilution technologies on the engine performance are explored. The results show that at 2400 rpm and 12 bar, EGR dilution can adopt more aggressive ignition advanced angle to achieve optimal combustion phasing. However, excess-air dilution has greater fuel economy than that of EGR dilution owing to larger in-cylinder polytropic exponent. As for prechamber, when dilution ratio is greater than 37.1%, the combustion phase is advanced, resulting in fuel economy improving. Meanwhile, only when the dilution ratio is under 36.2%, the HC emissions of excess-air dilution are lower than the original engine. With the increase of dilution ratio, the CO emissions decrease continuously. The NOX emissions of both dilution technologies are 11% of those of the original engine. Excess-air dilution has better fuel economy and very low CO emissions. EGR dilution can effectively reduce NOX emissions, but increase HC emissions. Compared with spark plug ignition, the pre chamber ignition has lower HC, CO emissions, and higher NO emissions. At part load, the pre-chamber ignition reduces NOX emissions to 49 ppm.

show abstract

Experimental and numerical investigations of charge motion and combustion in lean-burn natural gas engines

Cited by 69 publications

References 14 publications

Optical and thermodynamic investigations of a methane and hydrogen blend fueled large bore engine

Optical and thermodynamic investigations of a methane and hydrogen blend fueled large bore engine

A review of the pre-chamber ignition system applied on future low-carbon spark ignition engines

Economy and emission characteristics of the optimal dilution strategy in lean combustion based on GDI gasoline engine equipped with prechamber

Contact Info

Product

Resources

About