Water injection for gasoline engines – potentials and challenges

Hermann, I.; Glahn, Claus; Paroll, Martin; Gumprich, Werner

doi:10.1007/978-3-658-26528-1_7

Cited by 7 publications

(8 citation statements)

References 2 publications

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“…17, compare premixed direct injection and pure water direct injection based on the (Neumann et al, 2019) compression end temperatures in the combustion chamber. In all cases, water injection resulted in a decrease in temperature, but the highest temperature decrease was obtained through premixed direct injection (Hermann et al, 2019;Neumann et al, 2019).…”

Section: Water Injectionmentioning

confidence: 91%

“…These two benefits are connected since the reduced proclivity of knocking permits a higher compression ratio and thus CO 2 can be reduced (Baumgarten et al, 2018;Hermann et al, 2019;Neubauer et al, 2019;Seeley and Fischer, 2019).…”

Section: Water Injectionmentioning

confidence: 99%

“…Because wall wetting cools the components instead of the mixture, it degrades the efficiency of water injection. Injection into the intake manifold normally cools the intake air, while injection into the intake port and into the combustion chamber (direct injection) removes heat from the combustion chamber (Hermann et al, 2019;Neumann et al, 2019).…”

Section: Water Injectionmentioning

confidence: 99%

“…Furthermore, direct water injection also achieved Fig. 17 Compression End Temperatures for water injection concepts (Hermann et al, 2019) Fig. 18 The effect of water injection concepts on emissions (Neumann et al, 2019) a high score, so this method is also beneficial.…”

Section: Water Injectionmentioning

confidence: 99%

“…18 The effect of water injection concepts on emissions (Neumann et al, 2019) a high score, so this method is also beneficial. The use of intake manifold (plenum) injection is not recommended (Hermann et al, 2019).…”

Section: Water Injectionmentioning

confidence: 99%

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Investigation of Possibilities of λ = 1 Full Load Operation for Gasoline Engines in the Light of Future Emission Regulation

Szabados

Szűcs

Hézer

et al. 2022

Period. Polytech. Transp. Eng.

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To date, huge amounts of money have been invested in the development of internal combustion engines to reach the current level of technology. High specific power and good thermal efficiency have been achieved, thanks to which, internal combustion engines are now widely used. However, the driving force behind the developments is no longer the high performance, but the compliance with strict emission standards. Future emissions regulation, namely Euro 7, will be challenging for engine and vehicle manufacturers. One possible technical solution may be to use a stoichiometric air-fuel mixture on the entire engine map to meet the requirements of the Euro 7 emission standard. This article analyzes the change in Euro regulations in the light of Euro 7, as well as the theoretical background of the λ = 1 operation. Several technical possibilities to achieve the stoichiometric ratio, such as e.g. water injection or variable compression ratio are presented.

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Section: Water Injectionmentioning

confidence: 91%

Section: Water Injectionmentioning

confidence: 99%

Section: Water Injectionmentioning

confidence: 99%

Section: Water Injectionmentioning

confidence: 99%

Section: Water Injectionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of Possibilities of λ = 1 Full Load Operation for Gasoline Engines in the Light of Future Emission Regulation

Szabados

Szűcs

Hézer

et al. 2022

Period. Polytech. Transp. Eng.

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Effect of port water injection on suppressing knock in gasoline direct injection engines

Dai

zheng

Song

2022

Energy Science & Engineering

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The effect of different port water injection (PWI) ratios on the knock in gasoline direct injection engines is explored. First, a simulation study is carried out under knock conditions to explore the time and location of the knock and the chemical mechanism that causes it. Second, water injection amount to 10%, 20%, 30%, and 40% are set to explore the effects of different water injection ratios on knocking. The influence of the different water injection ratios on the chemical mechanism of knocking is evaluated and that of the chemical mechanism on the in‐cylinder temperature and the impact of heat release rate (HRR) is explored. The results show that PWI can effectively reduce the occurrence of spontaneous combustion in the cylinder by reducing the flame propagation speed. On one hand, the changes in the low‐temperature reaction substances CH2O and HRR tend to be consistent and the peaks of CH2O and HRR move back with the increase in water injection. So, different ratios of PWI can affect the flame propagation speed by affecting the generation and consumption of CH2O, OH radicals, and HCO radicals. Also, PWI can significantly reduce the generation of in‐cylinder OH radicals, ultimately suppressing the generation of the high‐temperature stage. In addition, PWI can effectively reduce the mean temperature and mean pressure. Compared to other water injection ratios, a 30% water injection ratio is the most effective at inhibiting knocking. At this time, the knocking intensity is the lowest, and the cycle power reaches its maximum of 1120 J.

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Analyse der Gemischbildung bei direkter Wassereinspritzung mittels innovativer 3D-CFDSimulationen

Chiodi

Vacca

Bargende

2021

Experten-Forum Powertrain: Ladungswechsel Und Emissionierung 2020

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Water injection for gasoline engines – potentials and challenges

Cited by 7 publications

References 2 publications

Investigation of Possibilities of λ = 1 Full Load Operation for Gasoline Engines in the Light of Future Emission Regulation

Investigation of Possibilities of λ = 1 Full Load Operation for Gasoline Engines in the Light of Future Emission Regulation

Effect of port water injection on suppressing knock in gasoline direct injection engines

Analyse der Gemischbildung bei direkter Wassereinspritzung mittels innovativer 3D-CFDSimulationen

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