Abstract
A quasi‐dimensional modelling study is conducted for the first time for a heavy duty, diesel‐fuelled, multicylinder engine operating in HCCI mode. This quasidimensional approach involves a zero‐dimensional single‐zone homogeneous charge compression ignition (HCCI) combustion model along with a one‐dimensional treatment of the intake and exhaust systems. A skeletal chemical kinetic scheme for n‐heptane was used in the simulations. Exhaust gas recirculation (EGR) and compression ratio (CR) were the two parameters that were altered in order to deal with the challenges of combustion phasing control and operating load range extension. Results from the HCCI mode simulations show good potential when compared to conventional diesel performance with respect to important performance parameters such as peak firing pressure, specific fuel consumption, peak pressure rise, and combustion noise. This study shows that HCCI combustion mode can be employed at part load of 25% varying the EGR rates between 0 and 60%.
Highlights
homogeneous charge compression ignition (HCCI) mode of operation has the potential to significantly reduce NOx and particulate emissions, while achieving high thermal efficiency and having the capability of operating with a variety of fuels
The present study focuses on simulating the engine system with a one-dimensional commercial code AVL Boost v10, using the single-zone HCCI combustion model
The parameters considered for conventional compression ignition engine validation are heat release rate, in-cylinder pressure, specific fuel consumption, peak firing pressure, boost pressure, fuel flow, air flow, and combustion noise
Summary
HCCI mode of operation has the potential to significantly reduce NOx and particulate emissions, while achieving high thermal efficiency and having the capability of operating with a variety of fuels. The single-zone or multizone model requires initial conditions to be specified at intake valve closing (IVC), including the average temperature, pressure of the mixture, and each concentration of species in the cylinder These initial conditions are difficult to be Journal of Combustion. Wang et al [4] studied the detailed chemical kinetics of HCCI by implementing it into each of the zero-dimensional, single-zone model, one-dimensional engine cycle model, and three-dimensional CFD model They carried out simulation and experiment on a four-stroke gasoline HCCI engine with direct injection. A quasi-dimensional approach towards simulating heavy-duty, diesel-fuelled HCCI operation is not found in the literature Based on this motivation, an engine currently in use for intracity bus application in India was chosen. The present study focuses on simulating the engine system with a one-dimensional commercial code AVL Boost v10, using the single-zone HCCI combustion model. The effect of EGR on combustion phasing is explored in this study for the operating condition of 1400 rpm and 25% load
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