This paper establishes a three-dimensional scavenging model and a gas flow mathematical model of the inner cylinder for one type of two-stroke diesel aero engine, and analyzes the structure of the gas ports. The calculation domain of the model is meshed by the methods of the multiple block coupling and bonding technology, and the boundary conditions are set by the GT-power. The Fluent software is applied to simulate the three-dimensional gas flow in the inner cylinder. The research results show that the cross scavenging easily produces scavenging blind spots at the weak flow area; the loop scavenging can form a preferable backflow at the radial direction, but the axial velocity is lower, decreasing the scavenging efficiency; The mixed scavenging reduces the scavenging blind spots and forms better spiral vortexes and higher axial swirls, and increases the exhaust velocity by 12.6% and 125.2%, respectively compared with the loop scavenging and the cross scavenging.
CHEN Qiangen
,
ZHANG Xiangjian
,
PAN Zhongjian
,
XU Xiaolong
. Numerical Simulation of Mixed Scavenging Methods for Two-stroke Diesel Aero Engines[J]. Science & Technology Review, 2014
, 32(22)
: 23
-28
.
DOI: 10.3981/j.issn.1000-7857.2014.22.002
[1] Mattarelli E, Paltrinierri F, Perini F, et al. 2-Stroke diesel engine for light aircraft[J]. SAE International Journal Engines, 2011, 4(2): 2338-2360.
[2] Gordan P B. Design and simulation of two-stroke engines[M]. Warrendale: Society of Automotive Engineers, 1996.
[3] 张航. 二冲程船用柴油机扫气过程CFD模拟分析[D]. 大连: 大连海事 大学, 2011. Zhang Hang. CFD simulation and analysis of scavenging process for two-stroke marine diesel engine[D]. Dalian: Dalian Maritime University, 2011.
[4] Rinaldini C, Mattarelli E, Golovitchev V. CFD analyses on 2-stroke high speed diesel engines[J]. SAE International Journal Engines, 2011, 4(2): 2240-2256.
[5] MattarelliE,RinaldiniCA,CantoreG,etal. 2-Strokeexternally scavenged engines for range extender applications[J]. SAE Technical Paper, 2012-04-16, doi:10.4271/2012-01-1022.
[6] 潘钟键, 何清华, 杨晶. 活塞航空重油发动机发展现状[J]. 科技导报, 2013, 31(34): 65-68. Pan Zhongjian, He Qinghua, Yangjing. Development situation of piston aviation heavy oil engine[J]. Science & Technology Review. 2013, 31 (34): 65-68.
[7] 陈林林. 二冲程煤油发动机性能数值模拟与喷油控制研究[D]. 南京: 南京航空航天大学, 2009. Chen Linlin. Research on numerical simulation of performance and fuel injection control for two-stroke kerosene engine[D]. Nanjing: Nanjing University of Aeronautics and Astronautics, 2009.
[8] 顾诵芬. 关于使用航空煤油活塞式发动机的评估[R]. 北京: 中国航空 运输协会通用航空委员会, 2008. Gu Songfen. Evaluation of piston engines on the use of aviation kerosene[R]. Beijing: General Aviation Committee of Chian Air Transportation Association, 2008.
[9] 杜发荣, 蒋彬. 气口参数对二冲程重油发动机扫气性能的影响[J]. 科 学技术与工程, 2011, 11(3): 528-531. Du Farong, Jiang Bin. The effects of ports parameters has on scavenging performance of two-stroke heavy oil engines[J]. Science Technology and Engineering, 2011, 11(3): 528-531.
[10] 蒋炎坤, 钟毅芳, 罗马吉, 等. 二冲程发动机扫排气道-缸内系统三 维瞬态数值模拟研究[J]. 内燃机学报. 2001, 19(2): 159-164. Jian Yankun, Zhong Yifang, Luo Maji, et al. Three-dimensional transient numerical simulation research for the scavenging system and the cylinder of two-stroke engines[J]. Transactions of CSICE, 2001, 19 (2): 159-164.
[11] 蒋炎坤. CFD辅助发动机工程的理论与应用[M]. 北京: 科学出版社, 2004. Jiang Yankun. The theory and application of engine engineering assisted by CFD[M]. Beijing: Science Press, 2004.
[12] 蒋炎坤, 钟毅芳, 罗马吉, 等. 二冲程发动机换气过程数理模型研究 的现状与发展[J]. 小型内燃机. 2000, 29(4): 1-4, 34. Jiang Yankun, Zhong Yifang, Luo Maji, et al. Current situation and development of model research of mathematics-physics in the gas exchange process for a two-stroke engine[J]. Small Internal Combustion Engine. 2000, 29(4): 1-4, 34.
