CFD analysis of hydrogen injection pressure and valve profile law effects on backfire and pre-ignition phenomena in hydrogen-diesel dual fuel engine

Menaa, A.; Lounici, Mohand Said; Amrouche, F.; Loubar, Khaled; Kessal, Mohand

doi:10.1016/j.ijhydene.2019.02.123

Cited by 35 publications

(11 citation statements)

References 41 publications

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“…In addition, the backflow of residual gas into the intake manifold can also occur and lead to backfire. 6,10,16 Particularly, if hydrogen accumulates directly at the inlet valve when it is opened and the residual gas charge has not yet been cooled by fresh intake air, this can lead to rapid ignition. Often, too long injection durations, an unsuitable arrangement of the injection valves or improper flow dynamics in the intake duct are favorable factors.…”

Section: Causes Of Backfirementioning

confidence: 99%

“…Often, too long injection durations, an unsuitable arrangement of the injection valves or improper flow dynamics in the intake duct are favorable factors. 9,[16][17][18] If backfire starts at a hot surface, it is likely to be due to inadequate cooling or very high loads. Typical components for this are the exhaust valves, sharp edges on the piston or parts of the spark plug.…”

Section: Causes Of Backfirementioning

confidence: 99%

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Optical screening investigations of backfire in a large bore medium speed hydrogen engine

Eicheldinger

Karmann

Prager

et al. 2021

International Journal of Engine Research

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Further improvement of hydrogen combustion in port fuel injection engines is limited by backfire. To overcome this drawback of hydrogen port fuel injection engines it is essential to locate and understand the reasons for the inflammation of a backfiring cycle. To contribute to this understanding a minimal invasive lateral optical access was developed for a medium speed large bore engine. The access uses a UV enhanced endoscope to investigate the OH radical’s natural chemiluminescence to locate the inflammation of a backfiring cycle in the combustion chamber. The investigations are carried out at high engine load. The optical investigations were based on a thermodynamic screening. This included the variation of the start of the hydrogen port fuel injection and the engine’s backpressure. These experiments prove the influence of exhaust backpressure and the start of injection on the probability of backfire. As higher backpressure leads to an increased probability of backfire, the SoI strategy has also a decisive influence. An optimum start of injection timing with less backfire under high backpressure was experimentally determined at 300°CA with respect to 720°CA as FTDC. The conducted optical investigations show that backfire starts by ignition by hot residual gasses during the first cycle located under the exhaust valves. Furthermore, the results show ongoing combustion in the intake manifold leading to serious damage of the engine if not prohibited.

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Section: Causes Of Backfirementioning

confidence: 99%

Section: Causes Of Backfirementioning

confidence: 99%

Optical screening investigations of backfire in a large bore medium speed hydrogen engine

Eicheldinger

Karmann

Prager

et al. 2021

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…It meant that mixture in cylinders were ignited, which could stimulate the backfire in the intake systems. Pre‐ignition was one of the main reasons causing backfire, as indicated by the work 15 . After the applications of the backfire control strategy, the average in‐cylinder temperature decreased continuously in the intake process.…”

Section: Resultsmentioning

confidence: 98%

“…Nowadays, hydrogen fuel has not been put into practice in large scales for internal combustion engine applications. Except for hydrogen fuel production and storage, backfire, 14 pre‐ignition, 15 knock, 16 and nitrogen oxides (NO x ) 17 also impeded the popularizations of hydrogen fuel utilizations in internal combustion engines. Backfire was much easier to happen when engines were fuelled with hydrogen than other fuels, due to its low ignition energy, wide flammability, and high flame propagation speed 18 .…”

Section: Introductionmentioning

confidence: 99%

“…Effective backfire control methods were widely investigated, including adjusting valve timing, using lean air/fuel mixture, adopting exhaust gas recirculation (EGR), employing intake air cooling, and so on 15,20,24 . Dhyani et al 25 indicated that both cooled EGR and water injection were effective to control backfire; however, water injection performed better due to higher reduction of flame propagation speed.…”

Section: Introductionmentioning

confidence: 99%

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An effective approach of dropping the backfire possibilities of a hydrogen‐fuelled opposed rotary piston engine

Gao

Tian

et al. 2021

Energy Science & Engineering

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Backfire of hydrogen‐fuelled internal combustion engines limits the hydrogen fuel applications and drops the power output. Opposed rotary piston (ORP) engines are characterized by high power density, smooth operations, and few moving parts. However, the intake structures of ORP engines tend to deliver high possibility of backfire under hydrogen utilization conditions due to more residual exhaust. This paper proposed an effective approach of eliminating backfire for a hydrogen fuelled ORP engine, and it did not generate any penalty of power output theoretically. The effectiveness of this method was demonstrated using a 3D numerical simulation method. The results indicated that the average in‐cylinder temperature started to increase at the start of the intake process if without any backfire control strategies; however, it decreased continuously if backfire control was applied. The mass flow rates of the intake fluid were at a low level without backfire control, but it increased sharply if backfire control was adopted. Backfire in this investigation was caused by the pre‐ignition of mixture in cylinders. The temperature in intake pipes reached up to 1000 K over backfire scenarios, and heat of reaction was higher than 3 W. Hydrogen mass fractions at the bottom of intake pipes were low at the start of intake process due to the backfire; meantime, slight backflow also happened in the intake process due to the pre‐ignition of cylinders mixture. The fluid velocity was higher than 100 m/s at the beginning of intake process if backfire was controlled.

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Experimental study on combustion characteristics of diesel–hydrogen dual-fuel engine

Qin

Yang

Jia

et al. 2020

J Therm Anal Calorim

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CFD analysis of hydrogen injection pressure and valve profile law effects on backfire and pre-ignition phenomena in hydrogen-diesel dual fuel engine

Cited by 35 publications

References 41 publications

Optical screening investigations of backfire in a large bore medium speed hydrogen engine

Optical screening investigations of backfire in a large bore medium speed hydrogen engine

An effective approach of dropping the backfire possibilities of a hydrogen‐fuelled opposed rotary piston engine

Experimental study on combustion characteristics of diesel–hydrogen dual-fuel engine

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