System identification and performance improvement to a micro gas turbine applying biogas

Chun Hsiang Yang, Cheng Chia Lee, Chiun-Hsun Chen

Research output: Contribution to journalArticle

6 Scopus citations


In this study, the effects of biogas fuels on the performance of an annular micro gas turbine (MGT) were assessed experimentally and numerically. In the experiments, the proposed MGT system was operated successfully under each test condition; minimum composition to the fuel with the biogas was roughly 50% CH 4 with 50% CO 2. The power output was around 170W at 85,000 RPM as 90% CH 4 with 10% CO 2 was used and 70W at 65,000 RPM as 70% CH 4 with 30% CO 2 was used. When a critical limit of 60% CH 4 was reached, the power output was extremely low. Furthermore, the theoretical Brayton cycle efficiency and electric efficiency of the MGT were calculated as 23% and 10%, respectively. Following the experiments, the measured data helped us identify the parameters of dynamic model in numerical simulation. Additionally, a numerical analysis of re-designed combustion chamber showed that the performance of MGT could be improved by raising the temperature at turbine inlet. This study presents a novel distributed power supply system that can utilize renewable biogas. The completed micro biogas power supply system is small, low cost, easy to maintain and suited to household use.

Original languageEnglish
Pages (from-to)1172-1176
Number of pages5
JournalWorld Academy of Science, Engineering and Technology
Issue number10
StatePublished - 1 Oct 2009


  • Biogas
  • Distributed power supply system
  • Micro Gas Turbine
  • System Identification

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