Fuel price crisis has caused people to demand a car that is having a low fuel consumption without compromising the engine performance. Designing a naturally aspirated engine which can enhance engine ...performance and fuel efficiency requires optimisation processes on air intake system components. Hence, this study intends to carry out the optimisation process on the air intake system and airbox geometry. The parameters that have high influence on the design of an airbox geometry was determined by using AVL Boost software which simulated the automobile engine. The optimisation of the parameters was done by using Design Expert which adopted the Box-Behnken analysis technique. The result that was obtained from the study are optimised diameter of inlet/snorkel, volume of airbox, diameter of throttle body and length of intake runner are 81.07 mm, 1.04 L, 44.63 mm and 425 mm, respectively. By using these parameters values, the maximum engine performance and minimum fuel consumption are 93.3732 Nm and 21.3695×10-4 kg/s, respectively. This study has fully accomplished its aim to determine the significant parameters that influenced the performance of airbox and optimised the parameters so that a high engine performance and fuel efficiency can be produced. The success of this study can contribute to a better design of an airbox.
•A tri-charged technology is the best solution over the problem of power consumption and turbo-lag.•A tri-charged technology can be implemented successfully on single cylinder four-stroke diesel ...engine.•Tri-charged technique improves the engine performance and reduced emissions.•The tri-charging boosting gives best performance when engine operates at 18 compression ratio.
In the present work the effects a Tri-charged technology on a single-cylinder four-stroke diesel engine was investigated at different operating conditions. The supercharger consumes output power, and the turbocharger has turbo-lag; thus, the tri-charged system is introduced to overcome the drawback of both super and turbocharger. The experimental trials were conducted at constant speed engine of 1500 rpm with variable load and compression ratio. The load varies from 0 kg to 12 kg at an interval of 2 kg each, and compression ratio 16–20. The result indicates a significant improvement in the volumetric efficiency due to super, turbo and tri-charged boost air, whereas the thermal efficiency reduces at low and part load due to super and turbocharger for all compression ratios. Further the engine modified with a tri-charged boost the thermal efficiency improved by 0.41 and 0.78% when operate at part and full load capacity. The tri-charging impact on the engine emissions also, CO, HC, NOX are reduced by 0.38, 0.73, and 0.53% respectively for CR18. Therefore the tri-charger can be applied to a single cylinder diesel engine without modification in design, engine performance and emission regulations can be satisfied.
