Study on in-cylinder flow characteristics based on the intake port inclination in motorcycles engine

• Main Authors: Wahono, Bambang, Putrasari, Yanuandri, Praptijanto, Achmad, Nur, Arifin, Suherman, Pratama, Mulia, Dimyani, Ahmad, Wardana, Muhammad K. A., Setiawan, Ardhika, Lim, Ocktaeck
• Format: Conference Proceeding
• Language: English
• Subjects: Air flow; Combustion chambers; Cylinders; Engines; Flow characteristics; Fluid flow; Inclination; Kinematics; Motorcycles; Turbulence; Turbulent flow
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0205778

This study attempted to statistically examine small engines' in-cylinder flow outcomes depending on changes in intake port inclination. Three different intake port inclinations are available: 0°, 11.5° (original), and 30°. This study also explores how the intake port inclination affects changes in inflow motion in-cylinder engines. In addition, this study sought to determine how the inclination of the intake port affected the features of the in-cylinder airflow that occurs in small engines while they are running. The outcome demonstrates that changes in intake port inclination have an impact on turbulent kinematic viscosity and length scale, with the largest increases occurring at intake ports inclined at 30°, with respective increases of 15.25% and 4.65%. According to this study, the intake port with 30° is the best model compared to other models because it creates vortices more effectively than other models, which increases turbulence in the cylinder. Additionally, the magnitude of the velocity changes in response to changes in the intake port inclination. The velocity flow will be greater the more inclined the intake port is. In the center of the in-cylinder engine is where the highest velocity is reached. Finally, it is anticipated that this study will contribute to the estimation of air flow and combustion chamber optimization, particularly in small engines.