Abstract
To further improve the cycle performance of gas turbines, a gas turbine cycle model based on interstage bleeding rotating detonation combustion was established using methane as fuel. Combined with a series of two-dimensional numerical simulations of a rotating detonation combustor (RDC) and calculations of cycle parameters, the pressure gain characteristics and cycle performance were investigated at different compressor pressure ratios in the study. The results showed that pressure gain characteristic of interstage bleeding RDC contributed to an obvious performance improvement in the rotating detonation gas turbine cycle compared with the conventional gas turbine cycle. The decrease of compressor pressure ratio had a positive influence on the performance improvement in the rotating detonation gas turbine cycle. With the decrease of compressor pressure ratio, the pressurization ratio of the RDC increased and finally made the power generation and cycle efficiency enhancement rates display uptrends. Under the calculated conditions, the pressurization ratios of RDC were all higher than 1.77, the decreases of turbine inlet total temperature were all more than 19 K, the power generation enhancements were all beyond 400 kW and the cycle efficiency enhancement rates were all greater than 6.72%.
Highlights
As one of the most important types of power plants, gas turbines are widely used in the fields of aviation, shipping, power stations, etc
Combined with a series of two-dimensional from the viewpoint of structural design, enormous convenience was brought in the design of mixer as numerical simulations and calculations of cycle variations of greater pressure gain the pressure of the mixing air was than or characteristic close to the and cycle performance were investigated at different compressor pressure ratios
The power generation enhancements were all beyond 400 kW and the cycle efficiency enhancement rates were all greater than 6.72%
Summary
As one of the most important types of power plants, gas turbines are widely used in the fields of aviation, shipping, power stations, etc. It is quite difficult to improve the cycle efficiency in conventional gas turbines due to the high entropy change during the combustion process [1,2]. Theoretical pure detonation combustion which has a lower entropy change and self-pressure gain compared with iso-pressure combustion under similar conditions has already attracted wide attention since the beginning of the 21st century [9,10]. Due to the difficulty of the high Mach number environment in the standing oblique detonation combustion process [11] and the high frequency ignition in the pulse detonation combustion process [12], rotating detonation with its wide working range and self-sustaining propagation has been attracting increasing attention. The evolution characteristics of rotating detonation wave [13,14], the thermodynamic characteristics of Entropy 2019, 21, 265; doi:10.3390/e21030265 www.mdpi.com/journal/entropy
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