NDLI: Modeling and Performance Analysis of a Dual-Shaft Counter-Rotating Gas Turbine

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Modeling and Performance Analysis of a Dual-Shaft Counter-Rotating Gas Turbine

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Modeling and Performance Analysis of a Dual-Shaft Counter-Rotating Gas Turbine

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Zhou, Qiao Yin, Zhao Tan, Chun-Qing Gao, Qing Tian, Yong-Sheng
Copyright Year	2018
Abstract	This paper proposes a modeling method for the 1+1/2 vaneless counter rotating turbine (VCRT) and carries out performance analysis of a micro gas turbine (MGT) with VCRT at off design conditions. The first task of this paper is to obtain performance characteristics maps and develop a characteristics modeling method of VCRT. The VCRT characteristics maps are obtained through 3-D CFD calculation. High pressure turbine (HPT) corrected rotational speed, shaft rotating speed ratio defined as the high pressure (HP) shaft rotational speed divided by low pressure (LP) shaft rotational speed, and the VCRT total expansion pressure ratio are selected to model a 3-D low pressure turbine (LPT) characteristics maps. However, the HPT characteristics map modeling method remains the same as the conventional one. An overall performance simulation model is established in Matlab/Simulink and validated by software GasTurb. The VCRT engine consumes fuel at a higher rate when delivering same power compared with the conventional gas turbine due to LPT performance degradation. When the relative LP shaft speed ranges from 100% to 96%, the performance of the VCRT engine and conventional engine is almost equivalent. As the LP shaft speed continues to drop off, however, the VCRT engine performance degrades considerably. The results indicate that it is crucial to design VCRT with a wide range of efficiency, especially the LPT. The VCRT engine control law also must be effectively optimized to ensure the engine performs well at part load working conditions.
File Format	PDF
ISBN	9780791852088
DOI	10.1115/IMECE2018-86146
Volume Number	Volume 6B: Energy
Conference Proceedings	ASME 2018 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2018-11-09
Publisher Place	Pittsburgh, Pennsylvania, USA
Access Restriction	Subscribed
Subject Keyword	Computational fluid dynamics Micro gas turbines Simulation models Computer software Fuels Modeling Pressure Engines Stress Design Performance characterization High pressure (physics) Gas turbines Turbines Matlab
Content Type	Text
Resource Type	Article

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