TY  - JOUR
T1  - CFD Modeling and Experimental Validation of Different Piston Crown
Designs in an HCCI Engine Fuelled with ISO-Octane
AU - Aljaberi, Hassan A. AU - Abdul Aziz, Nuraini AU - Aziz Hairuddin, A. 
JO  - Journal of Engineering and Applied Sciences
VL  - 13
IS  - 12
SP  - 4286
EP  - 4299
PY  - 2018
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2018.4286.4299
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2018.4286.4299
KW  - HCCI engine
KW  -piston crown designs
KW  -numerical simulation
KW  -performance
KW  -pressure
KW  -Malaysia
AB  - HCCI combustion incorporates the advantages of both Spark-Ignition (SI) engine and Compression
Ignition (CI) engines. The homogeneous mixture is inducted into the cylinder without throttling losses and
compressed until the mixture reaches the auto-ignition point then combustion occurs spontaneously without
discernable flame propagation. This feature helps to improve engine performance while producing a relatively
high thermal efficiency. In the present study, three-dimensional CFD calculation was used where mesh creation
and specific zone name with different topologies of each zone has been meshed separately using ANSYS.
Fluent was used to model combustion phenomenon in HCCI engine. The validation and simulation were
conducted based an HCCI single-cylinder engine fuelled with gasoline in a 4-stroke engine at an engine speed
of 1500 rpm with compression ratio of 11.7:1 evaluated using three split injection. Combustion parameters such
as cylinder pressure, temperature and heat release rate were obtained from the validation work. The CFD Model
yields good results for experiment and CFD simulation. The study focused on how different piston crown
designs affect the performance of the HCCI engines. Three different designs have been created and evaluated
through CFD analysis where all other engine-operating parameters were kept the same as the experimental work.
The pistons names A, B and C for simplicity. Then, the study will analyze the in-cylinder pressure, in-cylinder
temperature, heat release rate, turbulent kinetic energy, indicated mean effective pressure and power output of
different piston designs and evaluate the most suitable piston to be used in HCCI engines in order to improve
the engine performance. The results demonstrate the capability of improved piston crown design in HCCI
engine to reduce the levels of gas emissions from engines. All pistons in the investigation reached a peak
pressure and temperature above the experiment, pistons A had the highest peak pressure and temperature
followed by pistons B and C, respectively. Compared to other piston crown designs, the piston A has the
highest power output caused by high peak pressure towards the end of combustion that leads to passable
diffusion combustion. Piston A’s design could be used in an HCCI engine configuration to improve engine
performance.
ER  -