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- Title
Scavenge flow analysis of opposed-piston two-stroke engine based on dynamic characteristics.
- Authors
Fu-kang Ma; Chang-lu Zhao; Zhen-feng Zhao; Shuan-lu Zhang
- Abstract
Opposed-piston two-stroke engine has been proposed by Beijing Institute of Technology to improve power density and complete machine balance relative to conventional engines. In order to study opposed-piston two-stroke engine scavenging flow, a scavenging system was configured using a three-dimensional computational fluid dynamics model effectively coupled to experiments. The boundary conditions are obtained through one-dimensional working process simulation results and experiments. As the opposed-piston relative dynamic characteristics of opposed-piston two-stroke engine depend on different design and operating parameters including the opposed-piston motion phase difference and crankconnecting rod ratio, a numerical simulation program was built using MATLAB/Simulink to define opposed-piston motion profiles based on equivalent crank angle of opposed crank-connecting rod mechanism. The opposed-piston motion phase difference only affects scavenging timing while crank-connecting rod ratio affects scavenging timing and duration. Scavenging timing and duration are the main factors which affect scavenging performance. The results indicate that a match of opposed-piston motion phase difference and crank-connecting rod ratio has the potential to achieve high scavenging and trapping efficiency with a right flow in cylinder.
- Subjects
PISTONS; TWO-stroke cycle engines; POWER density; COMPUTATIONAL fluid dynamics; BOUNDARY value problems
- Publication
Advances in Mechanical Engineering (Sage Publications Inc.), 2015, p1
- ISSN
1687-8132
- Publication type
Article
- DOI
10.1177/1687814015581569