An Improved Spray Model for Reducing Numerical Parameter Dependencies in Diesel Engine CFD Simulations

Abani, Neerav; Kokjohn, Sage; Park, Seung-Hyun; Bergin, Michael; Munnannur, Achuth; Weng, Ning; Sun, Yong; Reitz, Rolf D.

doi:10.4271/2008-01-0970

Cited by 153 publications

(85 citation statements)

References 33 publications

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“…The grid has approximately 25,231 hexahedral cells. The typical cell size is smaller than 3 mm in three dimensions, which is much better than the grid employed by Abani et al [19]. Abani et al also employed a spray model similar to the one used in this study and found that the difference between the results of fine and coarse grids was not obvious.…”

Section: Computational Gridmentioning

confidence: 91%

CFD Investigation into Diesel PCCI Combustion with Optimized Fuel Injection

et al. 2011

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A multi-pulse injection strategy for premixed charge compression ignition (PCCI) combustion was investigated in a four-valve, direct-injection diesel engine by a computational fluid dynamics (CFD) simulation using KIVA-3V code coupled with detailed chemistry. The effects of fuel splitting proportion, injection timing, spray angles, and injection velocity were examined. The mixing process and formation of soot and nitrogen oxide (NO x ) emissions were investigated as the focus of the research. The results show that the fuel splitting proportion and the injection timing impacted the combustion and emissions significantly due to the considerable changes of the mixing process and fuel distribution in the cylinder. While the spray, inclusion angle and injection velocity at the injector exit, can be adjusted to improve mixing, combustion and emissions, appropriate injection timing and fuel splitting proportion must be jointly considered for optimum combustion performance.Keywords: diesel combustion; KIVA-3V; split injection; premixed charge compression ignition; emissions Acronyms: ATDC = after top dead centre; CO = carbon monoxide; EGR = exhaust gas recirculation; EVC = exhaust valve close; EVO = exhaust valve opening; HCCI = homogeneous charge compression ignition; HC = hydrocarbon; HRR = heat release rate; HSDI = high speed direct injection; HTHR = high temperature heat release; ISFC = indicated specific fuel consumption; IVC = intake valve close; IVO = intake valve OPEN ACCESSEnergies 2011, 4 518 opening; LTC = low temperature combustion; NO x = nitrogen oxides; PCCI = premixed charge compression ignition; PRR = pressure rise rate; TDC = top dead centre; TSC = two-stage combustion; UHC = unburned hydrocarbon

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Section: Computational Gridmentioning

confidence: 91%

CFD Investigation into Diesel PCCI Combustion with Optimized Fuel Injection

et al. 2011

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“…In order to decouple the predictions from factors related to mixture preparation, a nonreacting simulation of PRF29 sprays was performed using the grid-independent spray model of Abani et al [50] and the equivalence ratio distribution in the combustion chamber was compared with the measured data of Genzale et al [42]. In the model, fuel vapor from spray droplets was assigned to two fuel components according to their initial compositions in the fuel.…”

Section: Engine Combustionmentioning

confidence: 99%

A reduced chemical kinetic model for IC engine combustion simulations with primary reference fuels

Reitz

2008

Combustion and Flame

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“…The size of the computational grid is fixed as 2.0 mm in all directions according to grid sensitivity study. Atomization is described by the KH-RT breakup model [25] and the gas jet model to suppress grid dependence [26]. The model constants of KH-RT and gas jet models are maintained with no arbitrary tuning for diesel and biodiesel cases.…”

Section: Spray Characteristics In a Constant Volume Chambermentioning

confidence: 99%