Intake-generated tumbling motion has been recently proposed to enhance the turbulence level during compression stroke to promote the combustion rate and reduce operation variations. This study is to investigate the quality of the tumbling motion, especially for the engine with a bowl-in-piston. To overcome the difficulties on the flow visualization caused by the high-speed motion of a real engine, a transparent water-analogy-simulation system is designed based on similarity analysis and fabricated to model the operation of an actual engine. Benchmark tests including the qualitative flow visualization and quantitative full-field measurements using a high-speed PIA system have been conducted to study the time-varying nature of the tumbling motion within the cylinder. The results demonstrate the success on experimental set-ups and the potential of using the current system in studying the complex engine intake-generated tumbling motion.
Jeng, Yang-Liang; Chen, Rong-Che; and Chang, Chao-He
"Kalman Filter Effective to Hydrologic Routing?,"
Journal of Marine Science and Technology: Vol. 7:
1, Article 7.
Available at: https://jmstt.ntou.edu.tw/journal/vol7/iss1/7