Investigation of the Miller cycle on the performance and emission in a natural gas-diesel dual-fuel marine engine by using two zone combustion model

Gan, Huibing; Wang, Huaiyu; Tang, Yuanyuan; Wang, Guanjie

doi:10.2298/tsci190518420g

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…The working process calculation model is established in GT-Power as shown in Figure 1. According to relevant studies, the DIJET combustion model suitable for direct injection diesel engines was selected to study the combustion and emission performance of the diesel engine [8]. The calculation model was checked and verified by taking the parameters of diesel engine speed, power, cylinder pressure, intake and exhaust temperature, intake and exhaust pressure and emissions at 100%, 75%, 50% and 25% load conditions.…”

Section: Calculation Modelmentioning

confidence: 99%

“…In recent years, the development of new combustion technologies to reduce engine emissions has been very active. The combustion optimization technology of the internal combustion engine has become a hot topic in the industry at home and abroad [8,9]. The examples of such technology are as follows: low temperature intake [10], oxygen-enriched combustion [11], free-nitrogen combustion [12], nitrogen-enriched combustion [13], exhaust gas recirculation (EGR) [14], intake with humidification [15], etc.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Marine Two-Stroke Diesel Engine Based on Air Intake Composition and Temperature Control

Tan

et al. 2022

Atmosphere

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The influence of gas intake temperature, composition and the volume concentration of each gas component on diesel engine combustion, emission and the output power was studied by building a calculation model of the B&W 6S35ME-B9 marine two-stroke low-speed diesel engine, followed by a comprehensive optimization exploration. The results showed that under 295 K and 18.5% O2 of intake gas, the engine’s NOx emission is only 4.5 g/kWh and reduced to 58% from the normal air gas intake condition. Moreover, their power output is very similar. In addition, the effect of CO2 or H2O added into the intake of the diesel engine on the performance of the diesel engine can be compensated by reducing the intake temperature. At the intake temperature of 295 K, the engine’s NOx emission with 20.58% O2, 77.42% N2 and 2% H2O is 8.62 g/kWh, and 9.06 g/kWh under 20.79% O2, 78.21% N2 and 2% CO2. It is lower than 11.77 g/kWh, which is under normal intake conditions (315 K, 21%O2 and 79%N2). The power output is also similar to the normal intake condition. Therefore, the comprehensive optimization of gas intake temperature, composition and concentration can effectively optimize the diesel engine’s performance in terms of combustion, emission and power output. The research results have an important reference value for the optimization of diesel engine performance.

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Section: Calculation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of Marine Two-Stroke Diesel Engine Based on Air Intake Composition and Temperature Control

Tan

et al. 2022

Atmosphere

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“…3 [12]. The engine modeling and calibration were omitted here and the general method can be found in our previous works [12,43]. The validation results of the primary parameters of DF engine model in the gas model are reported in Table 2 and Fig.…”

Section: -D Simulation Model Calibrationmentioning

confidence: 99%

Parametric investigation of pre-injection on the combustion, knocking and emissions behaviour of a large marine four-stroke dual-fuel engine

Wang

Gan

Theotokatos

2020

Fuel

Self Cite

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This study aims at the parametric investigation of a large marine four-stroke dual-fuel engine in order to identify the pre-injection effects on the engine combustion, knocking and emissions parameters.A model was employed that was developed by integrating a 1-D engine model in AVL-BOOST and a 3-D CFD model in CONVERGE. The MAN 51/60DF marine engine is modelled and the simulation results were validated against experimental data. Subsequently, parametric runs for various pre-injection timings and mass ratios are performed and the simulation results are analysed and discussed. The derived incylinder pressure oscillations at determined points are employed to calculate the knock index (KI), which was used as an evaluation indicator for the knocking intensity. A number of pre-injection strategies with varying timing and fuel mass ratios are studied. This study results reveal that a lower knock trend and NO X emissions can be achieved by early pre-injection timing and increasing pre-injection fuel mass ratio.In addition, the medium pre-injection interval increases the engine IMEP while reducing the NO X and total hydrocarbon emissions. Larger pre-injection mass ratio reduce the KI and NO X emissions, but reduces IMEP and causes the wetted-wall phenomenon. Besides, the excessive pre-injection intervals and pre-injection mass ratio result in a change in combustion mode from the conventional diesel compression ignition mode to a two-stage auto-ignition mode. This study provides a better understanding of the underlying interactions of involved parameters and proposes pre-injection solutions to improve the engine performance, emissions and knocking behaviour.

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“…Such approaches feature a good compromise between accuracy and computational effort [7]. They are not as fast as ANN based models [8] but can ensure acceptable fastrunning characteristics [9] and several levels of detail can be implemented for augmenting predictive capabilities [10,11]. Data recorded on optically accessible units can ensure a solid starting point for model development and validation, as they feature high spatial resolution [12,13].…”

Section: Introductionmentioning

confidence: 99%

Towards better correlation between optical and commercial spark ignition engines through quasi-dimensional modeling of cycle-to-cycle variability

2022

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Internal combustion engines are still the main choice when considering propulsion technology in the transport sector. Spark ignition (SI) units offer the advantage of good efficiency with simpler after-treatment systems. Lean operation is a promising strategy that would further improve efficiency, but requires mitigation of cycle-to-cycle variability (CCV). Within this context, and given the increasing trend of using simulation based evaluations during engine development, the current work investigated combustion in an optical SI engine through measurements and quasi-dimensional simulation. The possibility of visualizing in-cylinder processes provides unique insight, but also introduces complications with respect to commercial engines. For this reason, quasi-dimensional simulation was applied so as to better understand the factors that induce CCV. For the specific case of the investigated engine, cycle-to-cycle measured exhaust air-fuel ratio was found to be directly correlated to variations of engine output. Several routes of incorporating these effects into simulations were evaluated. Introducing a random component in the period of laminar-turbulent flame transition was found to ensure good grounds for simulating peak pressure variability. Indicated mean effective pressure (IMEP) on the other hand was found to depend less on the initial stages of combustion and was strongly correlated to aforementioned variability of exhaust air-fuel ratio.

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Investigation of the Miller cycle on the performance and emission in a natural gas-diesel dual-fuel marine engine by using two zone combustion model

Cited by 9 publications

References 29 publications

Optimization of Marine Two-Stroke Diesel Engine Based on Air Intake Composition and Temperature Control

Optimization of Marine Two-Stroke Diesel Engine Based on Air Intake Composition and Temperature Control

Parametric investigation of pre-injection on the combustion, knocking and emissions behaviour of a large marine four-stroke dual-fuel engine

Towards better correlation between optical and commercial spark ignition engines through quasi-dimensional modeling of cycle-to-cycle variability

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