Experimental Investigation of the Impact of In-Cylinder Pressure Oscillations on Piston Heat Transfer

Gingrich, Eric; Janecek, Daniel; Ghandhi, J. B.

doi:10.4271/2016-01-9044

Cited by 11 publications

(4 citation statements)

References 28 publications

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“…The higher WHT for Gasoline-EP can be related to the intensity of ringing. 28,29 Indicative of the increased level of ringing is the PPRR shown earlier in Figure 2. In general, the reduced WHT went along with a significant increase in exhaust loss; in the case of Gasoline-EP by 6.2%, from 30.1% to 36.3%.…”

Section: Resultsmentioning

confidence: 88%

“…A potential reason for the lower BTE could be the stronger correlation between water/fuel ratio and PPRR in the case of Gasoline-LP which can increase the WHT. 28,29 Diesel-LP exhibited a lower BTE compared to Gasoline-LP for the no-water case due to an early combustion phasing caused by a premature combustion event, which will be discussed in subsequent sections and is shown in Figure 3. Diesel-LP started out with a BTE of 45.4% at a water/fuel ratio of 0%; when the water/fuel ratio was increased to 140%, the BTE reduced by 0.3%.…”

Section: Resultsmentioning

confidence: 95%

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The impact of water injection and exhaust gas recirculation on combustion and emissions in a heavy-duty compression ignition engine operated on diesel and gasoline

Pamminger

Wang

Hall

et al. 2019

International Journal of Engine Research

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Steady-state experiments were conducted on a 12.4L, six-cylinder heavy-duty engine to investigate the influence of port-injected water and dilution via exhaust gas recirculation (EGR) on combustion and emissions for diesel and gasoline operation. Adding a diluent to the combustion process reduces peak combustion temperatures and can reduce the reactivity of the charge, thereby increasing the ignition-delay and, allowing for more time to premix air and fuel. Experiments spanned water/fuel mass ratios up to 140mass% and exhaust gas recirculation ratios up to 20vol% for gasoline and diesel operation with different injection strategies. Diluting the combustion process with either water or EGR resulted in a significant reduction in nitrogen oxide emissions along with a reduction in brake thermal efficiency. The sensitivity of brake thermal efficiency to water and EGR varied among the fuels and injection strategies investigated. An efficiency breakdown revealed that water injection considerably reduced the wall heat transfer; however, a substantial increase in exhaust enthalpy offset the reduction in wall heat transfer and led to a reduction in brake thermal efficiency. Regular diesel operation with main and post injection exhibited a brake thermal efficiency of 45.8% and a 0.3% reduction at a water/fuel ratio of 120%. The engine operation with gasoline, early pilot, and main injection strategy showed a brake thermal efficiency of 45.0% at 0% water/fuel ratio, and a 1.2% decrease in brake thermal efficiency for a water/fuel ratio of 140%. Using EGR as a diluent reduced the brake thermal efficiency by 0.3% for diesel operation, comparing ratios of 0% and 20% EGR. However, a higher impact on brake thermal efficiency was seen for gasoline operation with early pilot and main injection strategy, with a reduction of about 0.8% comparing 0% and 20% EGR. Dilution by means of EGR exhibited a reduction in nitrogen oxide emissions up to 15 g/kWh; water injection showed only up to 10 g/kWh reduction for the EGR rates and water/fuel ratio investigated.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 95%

The impact of water injection and exhaust gas recirculation on combustion and emissions in a heavy-duty compression ignition engine operated on diesel and gasoline

Pamminger

Wang

Hall

et al. 2019

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…The pressure oscillations have been shown to lead to increased wall heat transfer resulting in fuel efficiency losses and, in some cases, to damages of the engine components. 3–5 This study seeks to develop a better understanding of the pressure oscillation and its effect on the in-cylinder gases and the heat transfer to the engine walls.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to knock-related concerns in traditional SI engines, the increased heat transfer to the engine walls is persistent in advanced combustion modes such as HCCI where significant pressure oscillations are present. Several experimental studies 4,9–11 have sought to quantify and model the wall heat transfer in the presence of pressure oscillations. Chang et al 9 used fast response thermocouples embedded in the piston and cylinder head surface to measure instantaneous wall temperature and heat flux for an HCCI engine.…”

Section: Introductionmentioning

confidence: 99%

Analysis of in-cylinder pressure oscillation and its effect on wall heat transfer

Kassa

Leroy

Robert

et al. 2020

International Journal of Engine Research

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In-cylinder pressure oscillations in internal combustion engines have been associated with increased heat losses and damages to the engine components. The links between the acoustic waves and the increased heat transfer (and potentially ensuing engine damages) have not yet been well understood. In this study, a high-fidelity large eddy simulation model incorporating an auto-ignition model is used to simulate the combustion process and the associated pressure oscillation at various engine operating conditions. The study serves to develop a better understanding of the acoustic waves in a combustion chamber and their effect on wall heat transfer. First, a simplified model of the pressure oscillations is proposed and shown to accurately characterize the pressure in the combustion chamber. Second, the simplified pressure model and acoustic theory are leveraged to develop a model of the in-cylinder gas velocities. Finally, a heat transfer model is presented that takes into consideration the pressure/velocity oscillations and the inherent acoustic properties of the trapped gas. The increase in heat transfer is shown to primarily stem from an increased heat transfer coefficient due to the velocity oscillations of the trapped gas. The results are consistent with previously observed experimental measurements of the heat flux in the presence of pressure oscillations.

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Combustion Characteristic Analysis

Maurya

2019

Mechanical Engineering Series

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Experimental Investigation of the Impact of In-Cylinder Pressure Oscillations on Piston Heat Transfer

Cited by 11 publications

References 28 publications

The impact of water injection and exhaust gas recirculation on combustion and emissions in a heavy-duty compression ignition engine operated on diesel and gasoline

The impact of water injection and exhaust gas recirculation on combustion and emissions in a heavy-duty compression ignition engine operated on diesel and gasoline

Analysis of in-cylinder pressure oscillation and its effect on wall heat transfer

Combustion Characteristic Analysis

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