Experimental Investigation on Pressure Rise Characteristics in an Ethylene Fuelled Wave Rotor Combustor

Li, Jianzhong; Gong, Erlei; Li, Yuan; Li, Wei; Zhang, Kaichen

doi:10.1021/acs.energyfuels.7b01769

Cited by 18 publications

(18 citation statements)

References 12 publications

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“…Thus, no hammer shock is generated, and the fresh mixture inside the channels is only stopped by a fan of expansion waves generated by closing the inlet port. The numerical results presented later clearly show that the pressure rise behind the detonation wave is less than a wave rotor combustor due to the lack of a precompression wave and existence of the expansion [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 87%

Investigation of Pressure Rise and Flame Acceleration Characteristics in a Single Channel of Wave Rotor Combustor with Spoilers

Zhang

Wei³

et al. 2019

International Journal of Aerospace Engineering

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A simplified single channel wave rotor combustor (WRC) experimental rig was established, in which the spoilers with different blockage ratios (BR) could be conveniently installed and disassembled. The spoilers were firstly used for WRC to improve the pressure rise. The effects of different blockage ratios on the pressure rise and flame acceleration characteristics in a single channel of the WRC were investigated. The addition of spoilers could remarkably improve the pressure rise and flame propagation speed in a single channel of the WRC. While the blockage ratio of the spoiler increases, both pressure rise and mean flame propagation speed are improved. When the spoilers with a blockage ratio of 38.91% are used, the peak pressure increases by 200% compared to that of WRC without the spoilers. When the spoilers of different blockage ratios (23.35%, 31.13%, and 38.91%) are used, it is found that the flame propagation speed is significantly improved with the increasing of the blockage ratio. Specifically, the maximum flame propagation speed reaches 55 m/s, and the maximum mean flame propagation speed is 36.95 m/s. Furthermore, combustion becomes more intense, and the flame is brighter around the spoiler.

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Section: Introductionmentioning

confidence: 87%

Investigation of Pressure Rise and Flame Acceleration Characteristics in a Single Channel of Wave Rotor Combustor with Spoilers

Zhang

Wei³

et al. 2019

International Journal of Aerospace Engineering

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“…b Unwrapped view of the wave rotor in the θ-z plane outlining distribution and location of shock and expansion waves [16,[24][25][26]. Recent research studies have taken up the concept and applied wave rotor technology to refrigeration cycles [27][28][29] and pressure-gain combustion [10,[30][31][32][33]. Wave rotors characterised by a non-axial channel shape to extract shaft power while operating as a pressure-exchange device have first been used in a gas turbine arrangement by Pearson [34].…”

Section: Literature Surveymentioning

confidence: 99%

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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“…Finally, the outlet duct closes, the inlet duct remains open, and shock waves are produced at the outlet duct. This process is also referred to the precompression process of the WRC [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Ethylene is a type of micromolecule hydrocarbon fuel that possesses much higher ignition, combustion velocity, and explosibility than other micromolecule hydrocarbon fuels making it suitable for use in WRCs [10]. Combustion of ethylene in the wave rotor channel is nonpremixed turbulent combustion, and previous numerical simulations on combustion in WRC generally adopt a single-step reaction mechanism [7]. The single-step reaction mechanism of ethylene can be used to provide flow distribution and temperature distribution information in the WRC channel; however, it fails to effectively analyze detailed ignition processes and flame front propagation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Combustion Characteristics of a Wave Rotor Combustor Based on a Reduced Reaction Mechanism of Ethylene

et al. 2018

International Journal of Aerospace Engineering

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To improve simulations of the flame and pressure wave propagation process and investigate the combustion characteristics of a wave rotor combustor (WRC), direct relation graphs with error propagation (DRGEP), quasi-steady-state assumption (QSSA), and sensitivity analysis were used to establish a reduced reaction mechanism comprised of 23 species and 55 elementary reactions, based on the LLNL N-Butane mechanism. The reduced reaction mechanism of ethylene was combined with an eddy dissipation concept (EDC) model to simulate the flame propagation characteristics in a simplified WRC channel. The effects of spoilers with different blockage ratios and hot-jets of different species on combustion characteristics of flame propagation and pressure rise in the WRC channel were investigated. When the heated inert air was used as hot-jet, the ignition delay time of WRC would increase, which indicated that the activity of the burned gas from the hot-jet igniter would affect the ignition delay time. The spoiler facilitates the coupling of flame and shock waves to reduce the coupling time and distance. With the blockage ratio of the spoiler increasing, the coupling time and distance would be reduced.

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Experimental Investigation on Pressure Rise Characteristics in an Ethylene Fuelled Wave Rotor Combustor

Cited by 18 publications

References 12 publications

Investigation of Pressure Rise and Flame Acceleration Characteristics in a Single Channel of Wave Rotor Combustor with Spoilers

Investigation of Pressure Rise and Flame Acceleration Characteristics in a Single Channel of Wave Rotor Combustor with Spoilers

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

Numerical Investigation of Combustion Characteristics of a Wave Rotor Combustor Based on a Reduced Reaction Mechanism of Ethylene

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