Effect of combustion regime on in-cylinder heat transfer in internal combustion engines

Jia, Ming; Gingrich, Eric; Wang, Hu; Li, Yaopeng; Ghandhi, J. B.; Reitz, Rolf D.

doi:10.1177/1468087415575647

Cited by 55 publications

(17 citation statements)

References 58 publications

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“…The normalized cumulative heat losses through all walls of the chamber are presented in Figure 7. The piston represents half of the heat losses (which is coherent with previous results stating a range of 50%–68% 1,2 and the cylinder head almost 20%. It should be reminded that the heat losses through the liner presented here do not result from a CHT simulation: a constant temperature is applied on the surface throughout the cycle, which limits the accuracy of this result.…”

Section: D Cht Simulations Without Coatingsupporting

confidence: 91%

“…In a context where improving efficiency of Diesel engines while limiting pollutant emission formation is crucial for car industry, the reduction in heat losses through the combustion chamber walls, which accounts for 14%–17% of the injected fuel energy, 1,2 has been the object of numerous studies over the past decades. The investigation of the potential of thermal barrier coatings (TBCs) to improve insulation of the combustion chamber was initiated in the 1980s.…”

Section: Introductionmentioning

confidence: 99%

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Modeling investigation of thermal insulation approaches for low heat rejection Diesel engines using a conjugate heat transfer model

Poubeau

Arthur

Duffour

et al. 2018

International Journal of Engine Research

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Heat losses through combustion chamber walls are a well-known limiting factor for the overall efficiency of internal combustion engines. Thermal insulation of the walls has the potential to decrease substantially these heat losses. However, evaluating numerically the effect of coating and of its location in the combustion chamber and then design an optimized combustion system require the use of high-fidelity engine models. The objective of this article is to present the whole workflow implying the use of three-dimensional computational fluid dynamics techniques with conjugate heat transfer (CHT) models to investigate the potential benefits of a coating on a passenger car Diesel engine. First, the baseline combustion system is modeled, using CHT models to solve in a coupled simulation the heat transfers between the fluid in the intake and exhaust lines and in the combustion chamber, on one hand, and the solid piston, head and valves, on the other hand. Based on this setup, a second simulation is performed, modeling a thermo-swing insulation on all combustion chamber walls by a contact resistance, neglecting its thermal inertia to keep a manageable computational cost. Results show a decrease of 3.3% in fuel consumption with an increase in volumetric efficiency. However, decoupled one-dimensional/three-dimensional simulations highlight the inaccuracy of these results and the necessity to model the coating thermal inertia, as they show an overestimation of the heat insulation rate and, consequently, of the gain in fuel consumption (−2.1% instead of −1.6%), for a coating on the piston with no thermal inertia.

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Section: D Cht Simulations Without Coatingsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Modeling investigation of thermal insulation approaches for low heat rejection Diesel engines using a conjugate heat transfer model

Poubeau

Arthur

Duffour

et al. 2018

International Journal of Engine Research

View full text Add to dashboard Cite

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“…The theoretical modeling is a useful way to predict trends and allows simulating multiple engine configurations at a lower cost than the experimental work, thus providing guidelines for further engine improvement. Few works dealing with the complete simulation of the engine energy balance can be found in the literature; the available ones show different points of view that can range from performing the analysis on the combustion chamber, 16,17 simulating the heat transfer at different engine sub-systems 18 or focusing in specific process such as engine cooling. 19 However, the complex phenomena involved in real operation makes difficult to face accurately the simulation of the complete system.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the energy balance during World harmonized Light vehicles Test Cycle in warmed and cold conditions using a Virtual Engine

Olmeda

Martín

Arnau

et al. 2019

International Journal of Engine Research

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In recent years, the interests on transient operation and real driving emissions have increased because of the global concern about environmental pollution that has led to new emissions regulation and new standard testing cycles. In this framework, it is mandatory to focus the engines research on the transient operation, where a Virtual Engine has been used to perform the global energy balance of a 1.6-L diesel engine during a World harmonized Light vehicles Test Cycle. Thus, the energy repartition of the chemical energy has been described with warmed engine and cold start conditions, analyzing in detail the mechanisms affecting the engine consumption. The first analysis focuses on the “delay” effect affecting the instantaneous energy balance due to the time lag between the in-cylinder processes and pipes: as a main conclusion, it is obtained that it leads to an apparent unbalance than can reach more than 10% of the cumulated fuel energy at the beginning of the cycle, becoming later negligible. Energy split analysis in cold starting World harmonized Light vehicles Test Cycle shows that in this condition the energy accumulation in the block is a key term at the beginning (about 50%) that diminishes its weight until about 10% at the end of the cycle. In warmed conditions, energy accumulation is negligible, but the heat transfer to coolant and oil are higher than in cold starting conditions (21% vs 28%). The lower values of the mean brake efficiency at the beginning of the World harmonized Light vehicles Test Cycle (only about 20%) is affected, especially in cold starting, by the higher mechanical losses due to the higher oil viscosity and the heat rejection from the gases. The friction plays an important role only during the first half of the cycle, with a percentage of about 65% of the total mechanical losses and 10% of the total fuel energy at the end of the World harmonized Light vehicles Test Cycle. However, at the end of the cycle, it does not affect dramatically the mean brake efficiency which is about 31% both in cold starting and warmed World harmonized Light vehicles Test Cycle.

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“…Spray break model is based on Lagrangian transport equations, with KHRT droplet breakup and NTC-collision approach. Boiling-evaporation model adapted is Forssling evaporation model having spray wall interaction model as rebound and slide [16,17]. Equation of state is Redwich Kwong which is an empirical, algebraic equation that relates temperature, pressure and volume of gases.…”

Section: Modelling Approachmentioning

confidence: 99%

Numerical study using detailed chemistry combustion comparing effects of wall heat transfer models for compression ignition diesel engine

et al. 2019

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The present work highlights the effect of wall heat transfer models on numerical predictions of combustion phenomenon in compression ignition diesel engine. A comparison of engine's performance is made using O'Rourke and Amsden, Han and Reitz and Angelberger heat transfer models. A detailed chemistry model employed comprises of 61 species and 235 reactions for n-heptane/diesel combustion. RANS RNG k-ε turbulence model (Reynolds-averaged Navier-Stokes: RANS; re-normalisation group: RNG; turbulent kinetic energy-rate of dissipation of turbulence energy: k-ε turbulence model) is used here to model mass, momentum and energy transport equations for engine computational fluid dynamics simulations. The study performed is on turbocharged 130PS 5.675L diesel engine and presented against experimental findings. Effect of different wall treatment models on accuracy and inherent computational time requirement for predicting engine P-θ (cylinder pressure vs. crank angle) curve, indicated mean effective pressure and AHRR (apparent heat release rate) is discussed in this paper. This comparative study facilitates in choosing optimum heat transfer model for in-cylinder combustion study vis-à-vis the trade-offs between solution accuracy (which drives product quality) versus computational time (which drives time to market).

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Effect of combustion regime on in-cylinder heat transfer in internal combustion engines

Cited by 55 publications

References 58 publications

Modeling investigation of thermal insulation approaches for low heat rejection Diesel engines using a conjugate heat transfer model

Modeling investigation of thermal insulation approaches for low heat rejection Diesel engines using a conjugate heat transfer model

Analysis of the energy balance during World harmonized Light vehicles Test Cycle in warmed and cold conditions using a Virtual Engine

Numerical study using detailed chemistry combustion comparing effects of wall heat transfer models for compression ignition diesel engine

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