Abstract
In this research, the residual gas, peak firing pressure increase, and effective release energy were completely investigated. To obtain this target, the experimental system is installed with a dynamo system and a simulation model was setup. Through combined experimental and simulation methods, the drawbacks of the hardware optimization method were eliminated. The results of the research show that the valve port diameter-bore ratio (VPD/B) has a significant effect on the residual gas, peak firing pressure increase, and effective release energy of a four-stroke spark ignition engine. In this research, the engine was performed at 3000 rpm and full load condition. Following increased IPD/B ratio of 0.3–0.5. The intake port and exhaust port diameter has a contrary effect on engine volumetric efficiency, the residual gas ratio increase 27.3% with larger intake port and decrease 18.6% with larger exhaust port. The engine will perform optimal thermal efficiency when the trapped residual gas fraction ratio is from 13% to 14%. The maximum effective release energy was 0.45 kJ at 0.4 intake port-bore ratio, and 0.451 kJ at 0.35 exhaust port-bore ratio. The NOx emission increases until achieved a maximum value after that decrease even VPD/B was still increasing. With a VPD/B ratio of 0.35 to 0.4, the engine works without the misfiring.
Highlights
There are a large number of motorcycles in operation today, with that number constantly increasing, the goal of improving motorcycle engine power, while satisfying Euro-5 emission standards, is worth investigating
The results showed that the decrease of the inlet valve close angle of all inlet port diameters is due to decrease engine power and increase
This paper presents an accurate method to investigate the on the other hand, the peak firing pressure increase and effective release energy are the roots of engine residual gas,peak firing pressure increase, combustion duration, and release energy of a efficiency
Summary
There are a large number of motorcycles in operation today, with that number constantly increasing, the goal of improving motorcycle engine power, while satisfying Euro-5 emission standards, is worth investigating. The results showed that the geometries of the combustion chamber and intake port had a significant effect on the flow into the cylinder They found that, when the intake valve diameter increased from 43 to 55 mm, the swirl ratio decreased 27.61% with directed port and decreased 17.65% with helical port. All previous studies lacked detail on the investigation the effect of exhaust port diameter-bore ratio on effective release energy, residual gas fraction and engine emission characteristics. These studies focus to present the inlet port configuration effect on intake air flow characteristics such as: swirl ratio, air flow motion, flow velocity distribution, or air flow tumble. Peak firing pressure increase, combustion duration, and effective release energy of a spark-ignition engine at various VPD/B
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