Exergy analysis in a low heat rejection IDI diesel engine by three dimensional modeling

Jafarmadar, Samad; Tasoujiazar, R.; Jalilpour, B.

doi:10.1002/er.3100

Cited by 14 publications

(8 citation statements)

References 41 publications

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“…The Eddy Break‐up model (EBU), which is based on turbulent mixing, is used for modeling of the combustion process as follows:

\bar{ρ {\overset{r}{true}}_{normalfu}} = \frac{C_{fu}}{τ_{R}} \bar{italicρ} min ({\bar{y}}_{normalfu}, \frac{{\bar{y}}_{ox}}{S}, \frac{C_{normalpr} . {\bar{y}}_{normalpr}}{1 + S}),

where it is assumed in this model that in premixed turbulent flames, the reactants are contained in the same eddies and are separated from eddies containing hot combustion products. The rate of dissipation of these eddies determines the rate of combustion.…”

Section: First Law and Energy Analysismentioning

confidence: 99%

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Numerical investigation of the effects of dwell time duration in a two‐stage injection scheme on exergy terms in an IDI diesel engine by three‐dimensional modeling

Jafarmadar

Zehni

2013

Energy Science & Engineering

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Dwell duration of multiple-injection scheme is an important parameter, which makes it possible to shift the tradeoff curve between soot and NOx closer to the origin. In this investigation, therefore, energy and exergy analyses are carried out for various two-step injection schemes in which 25% of the total fuel is injected during the second pulse and the dwell time is increased from 5°CA (crank angle) to 30°CA by 5°CA increments. The calculations are performed for a Lister 8.1 indirect injection (IDI) diesel engine at full load operation. The energy analysis for these schemes is performed during a closed cycle by using a three-dimensional CFD code. The cylinder pressure results for the baseline engine are compared with the corresponding experimental data and they show good agreement. For the exergy analysis, an in-house computational code has been developed, which uses the results of energy analysis in various cases. With crank angle positions and dwell durations set for different injection schemes, various rates of exergy are calculated and the cumulative exergy components are identified separately. The results show that the values of work exergy and exergy efficiency decrease when the dwell duration is changed from 5°CA to 30°CA. Also, there is a sharp change in the exergy parameters when the dwell time reaches 25°CA.

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“…The Eddy Break‐up model (EBU), which is based on turbulent mixing, is used for modeling of the combustion process as follows:

\bar{ρ {\overset{r}{true}}_{normalfu}} = \frac{C_{fu}}{τ_{R}} \bar{italicρ} min ({\bar{y}}_{normalfu}, \frac{{\bar{y}}_{ox}}{S}, \frac{C_{normalpr} . {\bar{y}}_{normalpr}}{1 + S}),

Section: First Law and Energy Analysismentioning

confidence: 99%

“…The Eddy Break-up model (EBU), which is based on turbulent mixing, is used for modeling of the combustion process [30] as follows:…”

Section: First Law and Energy Analysismentioning

confidence: 99%

Numerical investigation of the effects of dwell time duration in a two‐stage injection scheme on exergy terms in an IDI diesel engine by three‐dimensional modeling

Jafarmadar

Zehni

2013

Energy Science & Engineering

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“…These engines are sometimes classified as low grade, medium grade and high grade, depending on the degree of thermal insulation [25]. Increasing thermal insulation is associated with an increase of charge temperature inside the cylinder and an increase of the exhaust gas energy [26]. Also, a reduction of combustion noise and hydrocarbons and particulate matter emissions is observed [2].…”

Section: Introductionmentioning

confidence: 98%

Optimal piston motion for maximum net output work of Daniel cam engines with low heat rejection

Badescu

2015

Energy Conversion and Management

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“…Diesel engines are widely used as engineering machinery, automobile, vessel, and so on, because of their higher fuel economy, higher thermal efficiency, and higher torque output compared to other types of internal combustion engines . The main challenges in diesel engines are high exhaust nitrogen oxides (NO x ) and particulate matter (PM) emissions .…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic modeling and validation of in‐cylinder flow in diesel engines

Neshat

Nazemian

Honnery

2019

Env Prog and Sustain Energy

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The formation of a suitable air and fuel mixture in diesel engines is one of the most important factors in quality of combustion and engine exhaust emissions. The mixture formation depends on mass transfer phenomenon inside the combustion chamber. This study presents a new thermodynamic model to simulate the mass transfer phenomenon in diesel engines. Diesel engine is simulated utilizing a thermodynamic multi zone model coupled to a semi‐detailed chemical kinetics mechanism. Heat and mass transfer submodels are linked to the multi zone model. Bulk flow and diffusion mass transfer between zones are considered in the mass transfer submodel. Bulk mass transfer simulates fluid motion between different zones caused by piston speed and difference in zonal temperature and pressure. Diffusion mass transfer occurs due only to difference in composition of different zones. The results indicate diesel engine performance and exhaust emissions can be predicted accurately applying mass transfer submodels. Bulk mass transfer mechanism has more significant effects on engine performance and emission compared to diffusion mechanism. Neglecting mass transfer submodels, calculated in‐cylinder peak pressure is under predicted and both of exhaust NOx and soot are over predicted. The rates of soot oxidation reactions decrease and rates of NOx important reactions increase when mass transfer submodels are ignored. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

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Exergy analysis in a low heat rejection IDI diesel engine by three dimensional modeling

Cited by 14 publications

References 41 publications

Numerical investigation of the effects of dwell time duration in a two‐stage injection scheme on exergy terms in an IDI diesel engine by three‐dimensional modeling

Numerical investigation of the effects of dwell time duration in a two‐stage injection scheme on exergy terms in an IDI diesel engine by three‐dimensional modeling

Optimal piston motion for maximum net output work of Daniel cam engines with low heat rejection

Thermodynamic modeling and validation of in‐cylinder flow in diesel engines

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