International Scientific Journal


This paper focused on the mixer optimization by numerical simulation. The mixing and flow characteristics inside two different lobed mixers with/without centrum were obtained by three-dimensional CFD simulation. The core flow was the hot rich-methane/O2(l)burnt gas, while the cold air flew by the by-pass. The air/burnt gas flow ratio was improved from 7 to 9 in order to confirm the effect of air/burnt gas ratio on the mixing and flow characteristics. The simulation results indicated that no matter which mixer was used, there were a pair of symmetrical recirculation regions in the mixers, and the total temperature and species distribution turned to be more uniform at the increased mixing length. The mixing performance in the lobed mixer with centrum was slightly better than that of the lobed mixer without centrum, and the length of recirculation region in the lobed mixer with centrum was slightly shorter than that of the lobed mixer without centrum. The air/burnt gas ratio had considerable effect on the mixing and flow characteristics. The mixing performance with air/burnt gas ratio of 9 was much better than that of air/burnt gas ratio 7. Similar mixing performance would attain in the case of air/burnt gas ratio 9 with only half of the mixing length in the case ofair/burnt gas ratio 7. The recirculation region in the case of air/burnt gas ratio 9 occurred ahead of that of air/burnt gas ratio 7, and the former was longer than the latter.
PAPER REVISED: 2013-08-03
PAPER ACCEPTED: 2013-10-08
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THERMAL SCIENCE YEAR 2014, VOLUME 18, ISSUE Issue 4, PAGES [1203 - 1212]
  1. Hou Xiaochun, Ji Henming, Liu Qingguo, Yan Chuanjun, Zhao Jianxing. Combustion technology for high performance aviation gas turbine
  2. Smith L L, Majamak A T, Lam I T, Dalabory O, Karagozian A R, Marble E F, Smith O I. Mixing Enhancement in a Lobed Injector
  3. Liu Youhong, Xie Li. Analytical solution of mixing efficiency of lobed mixer
  4. Liu Youhong, Guo Nan, Li Jiangnin, Cai Juan, Xu Xingping. Effect of cut angles at trailing edge on the performance of a lobed mixer
  5. Lu Yuxia, Wu Shousheng, Wei Fuqing, Huang Yong. Aerodynamic performance of lobed mixers at different velocity ratios
  6. Shan Yong, Zhang Jingzhou, XuLiang. Numerical investigation of aerodynamic and mixing characteristics of scarfed lobed mixer for turbofan engine exhaust system
  7. Wu Chuan, Zhang Jingzhou, Shan Yong. Mixer investigation of turbofan engine with pulse detonation afterburners
  8. Shan Yong, Zhang Jingzhou. Numerical Investigation on the Effects of Lobe Nozzle Geometric Parameters on Mixer-Ejector Performance
  9. Hu Chunbo, Li Qiang, He Hongqing, Cai Timin, Zeng Zhuoxiong. Effects of the air inlet angle and jet number on mixing flow in the afterburning chamber of solid rocket ramjet
  10. Hui Hu, Tetsuo Saga, Toshio Kobayashi, and Nobuyuki Taniguchi. Mixing Process in a Lobed Jet Flow
  11. James Bridges and Mark P. Wernet. Cross-Stream PIV Measurements of Jets with Internal Lobed Mixers

© 2022 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence