Validation and optimization of the thermal cycle for a diesel engine by computational fluid dynamics modeling

Tutak, Wojciech; Jamrozik, Arkadiusz

doi:10.1016/j.apm.2016.02.021

Cited by 12 publications

(7 citation statements)

References 33 publications

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“…The piston-based internal combustion engine is a heat machine, which is still the most common device for driving motor vehicles and various types of working machines [1]. Currently, internal combustion engines are increasingly used in stationary solutions, in small distributed energy, as a source of propulsion for cogeneration units, generating electricity and heat (CHP) for the needs of the local market [2,3]. For stationary applications, there is a wide range of internal combustion engines, both spark ignition and compression ignition.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Performance and Emission of the diesel/CNG Dual-Fuel Combustion Mode in a Stationary CI Engine

2019

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One of the possibilities to reduce diesel fuel consumption and at the same time reduce the emission of diesel engines, is the use of alternative gaseous fuels, so far most commonly used to power spark ignition engines. The presented work concerns experimental research of a dual-fuel compression-ignition (CI) engine in which diesel fuel was co-combusted with CNG (compressed natural gas). The energy share of CNG gas was varied from 0% to 95%. The study showed that increasing the share of CNG co-combusted with diesel in the CI engine increases the ignition delay of the combustible mixture and shortens the overall duration of combustion. For CNG gas shares from 0% to 45%, due to the intensification of the combustion process, it causes an increase in the maximum pressure in the cylinder, an increase in the rate of heat release and an increase in pressure rise rate. The most stable operation, similar to a conventional engine, was characterized by a diesel co-combustion engine with 30% and 45% shares of CNG gas. Increasing the CNG share from 0% to 90% increases the nitric oxide emissions of a dual-fuel engine. Compared to diesel fuel supply, co-combustion of this fuel with 30% and 45% CNG energy shares contributes to the reduction of hydrocarbon (HC) emissions, which increases after exceeding these values. Increasing the share of CNG gas co-combusted with diesel fuel, compared to the combustion of diesel fuel, reduces carbon dioxide emissions, and almost completely reduces carbon monoxide in the exhaust gas of a dual-fuel engine.

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Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Performance and Emission of the diesel/CNG Dual-Fuel Combustion Mode in a Stationary CI Engine

2019

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“…Therefore, while single pressure transducer measurements provide enough information for analyzing thermodynamic conditions during the combustion process, the recreation of the in-cylinder unsteady pressure field demands additional measurement points across the combustion chamber 16 . Researchers have resorted to apply numerical methods for reproducing this field instead of building complex and expensive engine modifications for assessing the problem experimentally 17 . In line with this approach, computational fluid dynamics (CFD) codes are tool most commonly used to recreate the pressure field conditions in automotive applications 18,19 .…”

Section: Introductionmentioning

confidence: 99%

Understanding the unsteady pressure field inside combustion chambers of compression-ignited engines using a computational fluid dynamics approach

Torregrosa

Broatch

Margot

et al. 2018

International Journal of Engine Research

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In this article, a numerical methodology for assessing combustion noise in compression ignition engines is described with the specific purpose of analysing the unsteady pressure field inside the combustion chamber. The numerical results show consistent agreement with experimental measurements in both the time and frequency domains. Nonetheless, an exhaustive analysis of the calculation convergence is needed to guarantee an independent solution. These results contribute to the understanding of in-cylinder unsteady processes, especially of those related to combustion chamber resonances, and their effects on the radiated noise levels. The method was applied to different combustion system configurations by modifying the spray angle of the injector, evidencing that controlling the ignition location through this design parameter, it is possible to decrease the combustion noise by minimizing the resonance contribution. Important efficiency losses were, however, observed due to the injector/bowl matching worsening which compromises the performance and emissions levels.

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“…Mathematical modeling of the working cycle of a combustion engine begins with establishing a physical model of phenomena occurring during its duty cycle, then requires a mathematical description of the predetermined physical model, acceptance of appropriate initial and boundary conditions, and numerical solution of sets of equations of the accepted mathematical description [5,6]. For piston engines, modeling is a highly complex process, because it includes the thermodynamic and gasodynamic phenomena within the variable volume cylinder, including combustion chemistry and charge exchange processes.…”

Section: Engine Modelmentioning

confidence: 99%

“…In diesel engines, the challenge is to develop technology and optimize fuel injection [5,6]. The impact of different injection strategies on combustion is extremely important.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Thermal Cycle CI Engine with Multi-Stage Fuel Injection

Jamrozik

Tutak

Gnatowski

et al. 2017

Adv. Sci. Technol. Res. J.

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This work presents a complete thermal cycle modeling of a four-stroke diesel engine with a three-dimensional simulation program CFD -AVL Fire. The object of the simulation was the S320 Andoria engine. The purpose of the study was to determine the effect of fuel dose distribution on selected parameters of the combustion process. As a result of the modeling, time spatial pressure distributions, rate of pressure increase, heat release rate and NO and soot emission were obtained for 3 injection strategies: no division, one pilot dose and one main dose and two pilot doses and one main dose. It has been found that the use of pilot doses on the one hand reduces engine hardness and lowers NO emissions and on the other hand, increases soot emissions.

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Validation and optimization of the thermal cycle for a diesel engine by computational fluid dynamics modeling

Cited by 12 publications

References 33 publications

An Experimental Study on the Performance and Emission of the diesel/CNG Dual-Fuel Combustion Mode in a Stationary CI Engine

An Experimental Study on the Performance and Emission of the diesel/CNG Dual-Fuel Combustion Mode in a Stationary CI Engine

Understanding the unsteady pressure field inside combustion chambers of compression-ignited engines using a computational fluid dynamics approach

Modeling of Thermal Cycle CI Engine with Multi-Stage Fuel Injection

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