Development of a New Light Stratified-Charge DISI Combustion System for a Family of Engines With Upfront CFD Coupling With Thermal and Optical Engine Experiments

Han, Zhiyu; Weaver, Courtney; Wooldridge, Steve; Alger, Terrence; Hilditch, Jim; McGee, Jeff; Westrate, Barbara; Xu, Zheng; Yi, Jianwen; Chen, Xiangdong; Trigui, N.; Davis, George C.

doi:10.4271/2004-01-0545

Cited by 26 publications

(9 citation statements)

References 22 publications

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“…They report that re-entrance type piston is better than flat and bowl types for stratification because of its relatively smaller pit diameter. Based on the simulation results reported by Han et al [23], a shallow piston pit design not only enhances engine wide-open throttle performance, but also reduces design compromises caused by compression ratio. Shallow piston pit design that utilizes a converging shape for a better control of the mixture stratification is then developed to improve combustion.…”

Section: Introductionmentioning

confidence: 97%

Numerical study of the effect of piston top contour on GDI engine performance under catalyst heating mode

Zheng

Liu

Tian

et al. 2015

Fuel

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Section: Introductionmentioning

confidence: 97%

Numerical study of the effect of piston top contour on GDI engine performance under catalyst heating mode

Zheng

Liu

Tian

et al. 2015

Fuel

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“…In addition to the piston shapes, the injection strategy also plays an important role on controlling in-cylinder fuel stratification patterns. Earlier injection timing increases fuel surface wetting, resulting in excessive engine out smoke, while later injection timing decreases available time for air-fuel mixing prior to the time of ignition [24]. The results reported in [25] showed that misfire occurred when the charge was either over-mixed and too lean to ignite in the spark plug region or over-penetrated and located away from the spark plug to the intake side of the chamber.…”

Section: Hui Xie and Bang-quan Hementioning

confidence: 97%

Numerical Study of the Effect of Piston Shapes and Fuel Injection Strategies on In-Cylinder Conditions in a PFI/GDI Gasoline Engine

Wang¹,

Zhao²,

Xie³

et al. 2014

SAE Int. J. Engines

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INTRODUCTIONControlled Auto-ignition (CAI) combustion has been shown to effectively reduce the NOx emissions and increase fuel efficiency [1] and it has been subject to extensive studies in the past few decades. However, the lack of direct control on the auto-ignition process and relatively narrow operation range inhibit the practical application of this low temperature high efficient combustion mode [2]. In order to enhance the control of auto-ignition and extend the operation range of CAI combustion, spark ignition (SI) was used to assist CAI combustion. In this case, the early flame propagation induced by spark discharge could effectively control the later autoignition [3,4]. In addition, this hybrid combustion mode could be used to bridge pure SI mode and CAI mode during mode transition when applying to the full load operations in the practical engine [2,5,6,7,8]. However, the recent study on the SI-CAI hybrid combustion indicated the existence of significant cycle-to-cycle variation (CCV) during mode transition [8, 9, 10, 11].In the SI-CAI hybrid combustion, the flame propagation is mainly controlled by the transport of heat and active species in the flame front and distorted by the in-cylinder turbulence [12]. The variation of the early flame propagation would in turn affect the later auto-ignition process [13]. The premise of controlling and stabling SI-CAI hybrid combustion is to effectively manage the early flame propagation process. The local fuel/air equivalence ratio around the spark plug significantly affects the spark kernel formation and flame propagation process in spark ignition engine. Persson et al. [14] used high speed fuel Planar Laser-Induced Fluorescence (PLIF) to study the effect of fuel stratification on spark assisted compression ignition (SACI) with ethanol as fuel. They found the lower fuel concentration in the vicinity of the spark plug decreased the flame expansion speed with the overall lean mixture (lambda 1.4). Middleton et al. [15] investigated the propagation of premixed laminar reaction fronts with different fuel/air equivalence ratios using transient one-dimensional flame simulations and indicated the increased flame burning velocity with the isooctane/air equivalence ratio increasing from 0.1 to 1.0. The experimental Numerical Study of the Effect of Piston Shapes and Fuel Injection Strategies on In-Cylinder Conditions in a PFI/GDI Gasoline EngineXinyan Wang and Hua Zhao Tianjin Univ., Brunel Univ.Hui Xie and Bang-Quan He Tianjin Univ.ABSTRACT SI-CAI hybrid combustion, also known as spark-assisted compression ignition (SACI), is a promising concept to extend the operating range of CAI (Controlled Auto-Ignition) and achieve the smooth transition between spark ignition (SI) and CAI in the gasoline engine. In order to stabilize the hybrid combustion process, the port fuel injection (PFI) combined with gasoline direct injection (GDI) strategy is proposed in this study to form the in-cylinder fuel stratification to enhance the early flame propagation process and control the auto-...

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“…As discussed in [1,2,3,4], an upfront design and optimization process has been developed at Ford Motor Company and has been applied to develop various DISI (direct injection spark ignition) engine combustion systems. At the core of the process is the in-house developed MESIM (Multi-dimensional Engine Simulation) CFD code.…”

Section: Introductionmentioning

confidence: 99%

Applications of CFD Modeling in GDI Engine Piston Optimization

Curtis

et al. 2009

SAE Int. J. Engines

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This paper describes a CFD modeling based approach to address design challenges in GDI (gasoline direct injection) engine combustion system development. A Ford in-house developed CFD code MESIM (Multidimensional Engine Simulation) was applied to the study. Gasoline fuel is multi-component in nature and behaves very differently from the single component fuel representation under various operating conditions. A multi-component fuel model has been developed and is incorporated in MESIM code. To apply the model in engine simulations, a multi-component fuel recipe that represents the vaporization characteristics of gasoline is also developed using a numerical model that simulates the ASTM D86 fuel distillation experimental procedure. The effect of the multi-component model on the fuel air mixture preparations under different engine conditions is investigated. The modeling approach is applied to guide the GDI engine piston designs. Effects of piston designs on the fuel air mixture preparation are presented. It is found that the multi-component fuel model is critical to the accuracy of the model prediction of the fuel air preparation process, particularly under cold start conditions.

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Development of a New Light Stratified-Charge DISI Combustion System for a Family of Engines With Upfront CFD Coupling With Thermal and Optical Engine Experiments

Cited by 26 publications

References 22 publications

Numerical study of the effect of piston top contour on GDI engine performance under catalyst heating mode

Numerical study of the effect of piston top contour on GDI engine performance under catalyst heating mode

Numerical Study of the Effect of Piston Shapes and Fuel Injection Strategies on In-Cylinder Conditions in a PFI/GDI Gasoline Engine

Applications of CFD Modeling in GDI Engine Piston Optimization

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