Open AccessScavenge flow analysis of opposed-piston two-stroke engine based on dynamic characteristics
Author(s) -
Fukang Ma,
Changlu Zhao,
Zhenfeng Zhao,
Shuan-lu Zhang
Publication year - 2015
Publication title -
advances in mechanical engineering/advances in mechanical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.318
H-Index - 40
eISSN - 1687-8140
pISSN - 1687-8132
DOI - 10.1177/1687814015581569
Subject(s) - piston (optics) , crank , two stroke engine , scavenging , cylinder , four stroke engine , connecting rod , stroke (engine) , mechanics , power (physics) , control theory (sociology) , simulation , mechanical engineering , engineering , computer science , physics , chemistry , internal combustion engine , thermodynamics , combustion chamber , biochemistry , control (management) , organic chemistry , wavefront , artificial intelligence , combustion , optics , antioxidant
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 crank-connecting 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