Experimental results from the Bath<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:mrow><mml:mi>μ</mml:mi></mml:mrow></mml:math>-wave rotor turbine performance tests

Tüchler, Stefan; Copeland, Colin

doi:10.1016/j.enconman.2019.03.079

Cited by 22 publications

(13 citation statements)

References 39 publications

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“…Additionally, WRCs do not require a detonation process to achieve a pressure gain if combustion is fast enough [67]. Recently, several works on the feasibility, design, and thermodynamic analysis of the combustion cycle of WRCs have been performed [68,69]. Design and experimental testing of a WRC achieved stable operations at near-atmospheric inlet conditions over a wide range of overall equivalence ratios [70].…”

Section: Wave Rotor Combustors (Wrc)mentioning

confidence: 99%

Recent Combustion Strategies in Gas Turbines for Propulsion and Power Generation toward a Zero-Emissions Future: Fuels, Burners, and Combustion Techniques

et al. 2021

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The effects of climate change and global warming are arising a new awareness on the impact of our daily life. Power generation for transportation and mobility as well as in industry is the main responsible for the greenhouse gas emissions. Indeed, currently, 80% of the energy is still produced by combustion of fossil fuels; thus, great efforts need to be spent to make combustion greener and safer than in the past. For this reason, a review of the most recent gas turbines combustion strategy with a focus on fuels, combustion techniques, and burners is presented here. A new generation of fuels for gas turbines are currently under investigation by the academic community, with a specific concern about production and storage. Among them, biofuels represent a trustworthy and valuable solution in the next decades during the transition to zero carbon fuels (e.g., hydrogen and ammonia). Promising combustion techniques explored in the past, and then abandoned due to their technological complexity, are now receiving renewed attention (e.g., MILD, PVC), thanks to their effectiveness in improving the efficiency and reducing emissions of standard gas turbine cycles. Finally, many advances are illustrated in terms of new burners, developed for both aviation and power generation. This overview points out promising solutions for the next generation combustion and opens the way to a fast transition toward zero emissions power generation.

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Section: Wave Rotor Combustors (Wrc)mentioning

confidence: 99%

Recent Combustion Strategies in Gas Turbines for Propulsion and Power Generation toward a Zero-Emissions Future: Fuels, Burners, and Combustion Techniques

et al. 2021

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“…The wave rotor turbine forming the basis for this study and used as a baseline model for the optimisation has been extensively experimentally tested [47] and used for Q1D validation [6]. The prototype features symmetrically cambered wall profiles, following the shape of a parabola.…”

Section: Baseline Wave Rotormentioning

confidence: 99%

“…If the channel width of a candidate design is smaller than the 2.3-mm threshold, then a linear penalty function is assigned with a weighting factor of 1000 attributed to the difference between the candidate channel width and the minimum channel width. Finally, as power generation in wave rotors is generally pulsatile [47], the final optimisation constraint function within the objective func-tion aims at generating power in a as smooth as possible manner. This is done by imposing an offset between subsequent cycles and thus avoiding large torque amplitudes.…”

Section: Wave Rotor Optimisationmentioning

confidence: 99%

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Numerical optimisation of a micro-wave rotor turbine using a quasi-two-dimensional CFD model and a hybrid algorithm

Tüchler

Copeland

2021

Shock Waves

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Wave rotors are unsteady flow machines that exchange energy through pressure waves. This has the potential for enhancing efficiency over a wide spectrum of applications, ranging from gas turbine topping cycles to pressure-gain combustors. This paper introduces an aerodynamic shape optimisation of a power generating non-axial micro-wave rotor turbine and seeks to enhance the shaft power output while preserving the wave rotor’s capacity to function as a pressure-exchanging device. The optimisation considers six parameters including rotor shape profile, wall thickness, and number of channels and is done using a hybrid genetic algorithm that couples an evolutionary algorithm with a surrogate model. The underlying numerical model is based on a transient, reduced-order, quasi-two dimensional computational fluid dynamics model at a fixed operating condition. The numerical results from the quasi-two-dimensional optimisation indicate that the best candidate design increases shaft power by a factor of 1.78 and imply a trade-off relationship between torque generation and pressure exchange capabilities. Further evaluation of the optimised design using three-dimensional computational fluid dynamics simulations confirms the increase in power output at the cost of increased entropy production. It is further disclosed that increased incidence losses during the initial opening of the channel to the high-pressure inlet duct compromise the shock strength of the primary shock wave and account for the decrease in pressure ratio. Finally, the numerical trends are validated using experimental data.

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“…Also, the practical application effects of curved channels in GWEs were veried via comparative experiments. Different from internal combustion wave rotors or gas wave superchargers, which both employ curved channels to provide sha power output, [33][34][35][36] this research focuses on using a curved channel to reduce the energy loss inside a GWE and improve its working efficiency. The research results can play a certain role in promoting theoretical improvements and extending the application of this technology.…”

Section: Introductionmentioning

confidence: 99%

Performance experiments with a gas wave ejector equipped with curved channels and an analysis of the influence of channel angles

Zhao

2022

RSC Adv.

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Experimental results from the Bathμ-wave rotor turbine performance tests

Cited by 22 publications

References 39 publications

Recent Combustion Strategies in Gas Turbines for Propulsion and Power Generation toward a Zero-Emissions Future: Fuels, Burners, and Combustion Techniques

Recent Combustion Strategies in Gas Turbines for Propulsion and Power Generation toward a Zero-Emissions Future: Fuels, Burners, and Combustion Techniques

Numerical optimisation of a micro-wave rotor turbine using a quasi-two-dimensional CFD model and a hybrid algorithm

Performance experiments with a gas wave ejector equipped with curved channels and an analysis of the influence of channel angles

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