Description and Analysis of Diesel Engine Rate of Combustion and Performance Using Wiebe's Functions

Miyamoto, Noboru; Chikahisa, Takemi; Murayama, Tadashi; Sawyer, Robert F.

doi:10.4271/850107

Cited by 138 publications

(63 citation statements)

References 8 publications

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“…The stream (13) then enters a separator which separates the stream into an ammonia lean liquid stream (14) and an ammonia rich vapour stream (17). Both of these streams give off heat in REC 2.…”

Section: Kalina Cyclementioning

confidence: 99%

“…However, high ammonia concentrations require relatively high condensation pressures. Therefore, the separator supplies a stream of fluid with a relatively low concentration of ammonia (14), which is mixed with the turbine outlet stream (6). The separator also has to supply an ammonia rich stream (17) to be mixed with the stream that has been condensed (10), at a sufficient rate in order to restore the stream concentration which again will be running through the turbine.…”

Section: Kalina Cyclementioning

confidence: 99%

“…The combustion process is divided into intervals, and the product composition and the flame temperature are calculated in each interval. A double Wiebe function [14] is used to estimate heat release. Heat losses in the cylinder are estimated using the Woschni correlation [15].…”

Section: Engine Modelmentioning

confidence: 99%

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A comparison of advanced heat recovery power cycles in a combined cycle for large ships

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Section: Kalina Cyclementioning

confidence: 99%

Section: Kalina Cyclementioning

confidence: 99%

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A comparison of advanced heat recovery power cycles in a combined cycle for large ships

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“…A double Wiebe function [13] is used to model the heat release, the Woschni correlation [14] is used to predict heat transfer and the NOx emissions are predicted using the extended Zeldovich mechanisms [15]. EGR is modelled by adding the specified amount of exhaust gas to the intake air, and the resulting exhaust gas composition is found by iteration.…”

mentioning

confidence: 99%

Development of a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships

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et al. 2015

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a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships. Energy, 80, 545-555. DOI: 10.1016/j.energy.2014 Development of a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships AbstractThe international regulations on fuel efficiency and NOx emissions of commercial ships motivate the investigation of new system layouts, which can comply with the regulations. In combustion engines, measures to reduce the fuel consumption often lead to increased NOx emissions and careful consideration of this trade-off mechanism is required in the design of marine propulsion systems.This study investigates five different configurations of two-stroke diesel-based machinery systems for large ships and their influence on the mentioned trade-off. Numerical models of a low-speed two-stroke diesel engine, turbochargers and an organic Rankine cycle, are used for the optimisation of the NOx and fuel consumption at design and part-load conditions, using a multi-objective genetic algorithm. Moreover, the effects of engine tuning and exhaust gas recirculation are investigated.The results suggest that increased system complexity can lead to lower fuel consumption and NOx.Fuel consumption reductions of up to 9% with a 6.5% NOx reduction were achieved using a hybrid turbocharger and organic Rankine cycle waste heat recovery system.

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“…In some studies, the superimposition of several Wiebe functions is required to closely reproduce the heat release rate in several stages during the combustion process (3) - (5) . However, the Wiebe function requires experimental data to conduct pre-calculations of the heat release profile for different operating conditions (e.g., injection timing or pressure), therefore, the obtained function cannot be applied to different engine systems and operating conditions (6) .…”

Section: Introductionmentioning

confidence: 99%

Diesel Engine Dynamics Modeling Considering Fuel Injection Period Based on Combustion Heat Release Rate Identification

Zar

Uchiyama

Unno

et al. 2013

JTST

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Heat release rate is an important parameter that affects diesel engine characteristics. The behaviors of intake and exhaust systems are also important because these systems govern the fluid flow into engine cylinders. This study presents a diesel engine dynamics model based on the identification of the combustion heat release rate and intake and exhaust valve properties. Using the identification results, instantaneous engine speeds and cylinder pressures can be obtained by considering fuel injection period, air intake and exhaust properties, the in-cylinder combustion process, and crank rotational dynamics. The simulation results for the engine speed and in-cylinder pressure indicate good agreement with experimental data for different external loads and low and high engine speeds.

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Description and Analysis of Diesel Engine Rate of Combustion and Performance Using Wiebe's Functions

Cited by 138 publications

References 8 publications

A comparison of advanced heat recovery power cycles in a combined cycle for large ships

A comparison of advanced heat recovery power cycles in a combined cycle for large ships

Development of a model for the prediction of the fuel consumption and nitrogen oxides emission trade-off for large ships

Diesel Engine Dynamics Modeling Considering Fuel Injection Period Based on Combustion Heat Release Rate Identification

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