A generalized renormalization group turbulence model and its application to a light-duty diesel engine operating in a low-temperature combustion regime

2012 ◽  
Vol 14 (3) ◽  
pp. 279-292 ◽  
Author(s):  
Bao-Lin Wang ◽  
Chang-Wook Lee ◽  
Rolf D Reitz ◽  
Paul C Miles ◽  
Zhiyu Han
Keyword(s):  
Renormalization Group ◽  
Diesel Engine ◽  
Low Temperature ◽  
Turbulence Model ◽  
Combustion Regime ◽  
Low Temperature Combustion ◽  
Light Duty ◽  
Temperature Combustion

UHC and CO Emissions Sources From a Light-Duty Diesel Engine Undergoing Late-Injection Low-Temperature Combustion

2009 ◽  
Author(s):  
Isaac W. Ekoto ◽  
William F. Colban ◽  
Paul C. Miles ◽  
Ulf Aronsson ◽  
O¨ivind Andersson ◽  
...  
Keyword(s):  
High Temperature ◽  
Diesel Engine ◽  
Low Temperature ◽  
Injection Timing ◽  
Spatial Distributions ◽  
Low Temperature Combustion ◽  
Light Duty ◽  
Temperature Heat ◽  
Temperature Combustion ◽  
Homogeneous Reactor

Low load carbon monoxide (CO) and unburned hydrocarbon (UHC) emissions sources are examined in an optically accessible, light-duty diesel engine employing a late-injection, low-temperature combustion strategy. The study focus is to identify the cause of the rapid degradation in emissions and efficiency as injection timing is retarded. The in-cylinder progression of mixing and combustion processes is examined through ultraviolet planar laser-induced fluorescence (UV PLIF) imaging of hydrocarbon spatial distributions. Spectrally-resolved, deep-UV LIF measurements are also used to construct late-cycle spatial distributions of CO, C2, and polycyclic aromatic hydrocarbons within the clearance volume. Engine-out emissions measurements and numerical results from both detailed chemistry homogeneous reactor and multidimensional simulations complement the measurements. The measured spatial distributions show that while most fuel accumulates on the bowl-pip during high-temperature heat-release, much of it is transported into the squish-volume by the reverse squish flow. Homogeneous reactor simulations further show that expansion cooling quenches reactions, preventing the transition to high-temperature heat-release for mixtures with an equivalence ratio below 0.6. Lean squish-volume mixtures, coupled with wall heat losses, severely inhibit squish volume fuel oxidation. Further retarding injection timing exacerbates quenching, resulting in a two-fold increase in UHC emissions and a 33% increase in CO, primarily from the squish-volume.

Fuel Effects on Low Temperature Combustion in a Light-Duty Diesel Engine

2010 ◽  
Author(s):  
Alok Warey ◽  
Jean-Paul Hardy ◽  
Manuela Hennequin ◽  
Marek Tatur ◽  
Dean Tomazic ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Low Temperature ◽  
Low Temperature Combustion ◽  
Light Duty ◽  
Temperature Combustion ◽  
Fuel Effects

UHC and CO Emissions Sources from a Light-Duty Diesel Engine Undergoing Dilution-Controlled Low-Temperature Combustion

2009 ◽  
Vol 2 (2) ◽  
pp. 411-430 ◽  
Author(s):  
Isaac W. Ekoto ◽  
Will F. Colban ◽  
Paul C. Miles ◽  
Sung Wook Park ◽  
David E. Foster ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Low Temperature ◽  
Low Temperature Combustion ◽  
Light Duty ◽  
Temperature Combustion

An Investigation of the Low Temperature Combustion Regime (LTC) in a Small Bore HSDI Diesel Engine

2005 ◽  
Author(s):  
Jasmeet Singh ◽  
Yusuf Poonawala ◽  
Inderpal Singh ◽  
Naeim A. Henein ◽  
Walter Bryzik
Keyword(s):  
Diesel Engine ◽  
Low Temperature ◽  
Fuel Economy ◽  
Combustion Regime ◽  
Injection System ◽  
Fuel Vapor ◽  
Low Temperature Combustion ◽  
Wide Range ◽  
Temperature Combustion ◽  
Hsdi Diesel Engine

The low temperature combustion regime (LTC) has been known to simultaneously reduce both NOx and smoke emissions. The concept is to burn the fuel vapor-air charge, low in oxygen concentration, at low temperatures to reduce the formation of both NOx and smoke emissions. The paper investigates two combustion concepts in the LTC regime, the MK (modulated kinetics) and the smokeless locally rich diesel combustion and proposes a new strategy for a further reduction in emissions with minimum penalty in fuel economy. Tests were carried out under simulated turbo charged conditions on a single cylinder, small bore HSDI diesel engine with a re-entrant bowl combustion chamber. The engine is equipped with a common rail fuel injection system. Tests covered a wide range of injection pressures, EGR rates, injection timings and swirl ratios to determine their individual and collective contributions in engine-out emissions and fuel economy within this combustion regime. The proposed strategy is based on the results of this experimental investigation.

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