Effect of scavenge port angles on flow distribution and performance of swirl-loop scavenging in 2-stroke aircraft diesel engine
| Autor: | Yunhai Zhao, Xintao Zheng, Shuiting Ding, Qi Zhang, Yu Zhou, Farong Du, Fenzhu Ji |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Materials science 2-Stroke Swirl-Loop Scavenging (SLS) Flow (psychology) Aerospace Engineering 02 engineering and technology Reynolds stress Computational fluid dynamics Diesel engine 01 natural sciences 010305 fluids & plasmas law.invention 020901 industrial engineering & automation Aircraft diesel engine law 0103 physical sciences Two-stroke engine Scavenging Motor vehicles. Aeronautics. Astronautics Computational Fluid Dynamics (CFD) Scavenge port angles business.industry Turbulence Mechanical Engineering TL1-4050 Mechanics Particle Image Velocimetry (PIV) Particle image velocimetry business |
| Zdroj: | Chinese Journal of Aeronautics, Vol 34, Iss 3, Pp 105-117 (2021) |
| ISSN: | 1000-9361 |
| Popis: | Swirl-Loop Scavenging (SLS) improves the performance of 2-stroke aircraft diesel engine because the involved swirl may not only benefit the scavenging process, but also facilitate the fuel atomization and combustion. The arrangement of scavenge port angles greatly influences in-cylinder flow distribution and swirl intensity, as well as the performance of the SLS engine. However, the mechanism of the effect and visualization experiment are rarely mentioned in the literature. To further investigate the SLS, Particle Image Velocimetry (PIV) experiment and Computational Fluid Dynamics (CFD) simulation are adopted to obtain its swirl distribution characteristics, and the effect of port angles on scavenging performance is discussed based on engine fired cycle simulation. The results illustrate that Reynolds Stress Turbulence model is accurate enough for in-cylinder flow simulation. Tangential and axial velocity distribution of the flow, as well as the scavenging performance, are mainly determined by geometric scavenge port angles αgeom and βgeom. For reinforcement of scavenging on cross-sections and meridian planes, αgeom value of 27° and βgeom value of 60° are preferred, under which the scavenging efficiency reaches as high as 73.7%. Excessive swirl intensity has a negative effect on SLS performance, which should be controlled to a proper extent. |
| Databáze: | OpenAIRE |
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