Wave engine topping cycle assessment

Welch, Gerard E.

doi:10.2514/6.1997-707

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…An additional important benefit, presented in the previous section, consists in the possibility of using lower design TETs. These benefits are nil for the IRC and the designs for a minimum SFC, while they are high in the cases of WRTC and CV cycles, especially in the case of the CV cycle (Figs 8,15,and 21). This TET benefit can also be relevant for the IRC, and for designs for higher overall pressure ratios and constant ST, but it will be offset by lower SFC benefits.…”

Section: Discussionmentioning

confidence: 98%

“…References [5] and [20] present the application of inter-stage turbine combustion and continuous turbine combustion cycles; the results show an important benefit of ST, but with an increase of SFC due to a lower propulsive efficiency, requiring therefore a new combustor-turbine technology. NASA has also devoted much work to the wave rotor simulation and development [14,[21][22][23][24][25][26]. Three cycles have received a special attention for their application to turbojets during in recent years.…”

Section: Candidate Cycles Descriptionmentioning

confidence: 99%

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An insight into some innovative cycles for aircraft propulsion

Corchero

Montañés

Pascovici

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part G:

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Abstract:Emissions are important drivers in the design and use of aero-engines. This paper presents a part of the work carried out in the VITAL (EnVIronmenTALly aero-engine) project; it consists of a parameter study on the application of three innovative thermodynamic cycles to aircraft propulsion, looking for benefits on fuel consumption, carbon dioxide, nitrogen oxides, and noise. These cycles are intercooler-regenerative, the wave rotor topping, and the constant volume combustor cycles. The work, starting from a next-generation ultra-high bypass ratio turbofan, the baseline, and considering two possible design conditions, presents the influence of the application of these new cycles or design changes to the baseline on emissions and on the required technological level, represented by the turbine entry temperature (TET). VITAL is a project supported by the Sixth Framework Programme of the European Communities. The results show that some significant benefits on emissions can be achieved although they are linked to significant technology improvements and in-depth studies of the new components involved in cycle implementation.

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Section: Discussionmentioning

confidence: 98%

Section: Candidate Cycles Descriptionmentioning

confidence: 99%

An insight into some innovative cycles for aircraft propulsion

Corchero

Montañés

Pascovici

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…The application range for wave rotors outlined by literature is diverse. The bulk of early studies focused on pressure exchangers with straight passage profiles for gas turbine topping cycles [1][2][3][4][5][6][7][8] and supercharging devices for internal combustion engines [9][10][11][12][13][14][15][16]. In recent years the application to refrigeration cycles [17][18][19] and pressure-gain combustors [20][21][22] has come into the focus of consideration.…”

Section: Introductionmentioning

confidence: 99%

Validation of a Numerical Quasi-One-Dimensional Model for Wave Rotor Turbines With Curved Channels

Tüchler

Copeland

2020

Journal of Engineering for Gas Turbines and Power

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A wave rotor is a shock-driven pressure exchange device that, while relatively rarely studied or indeed, employed, offers significant potential efficiency gains in a variety of applications including refrigeration and gas turbine topping cycles. This paper introduces a quasi-one-dimensional (Q1D) wave action model implemented in matlab for the computation of the unsteady flow field and performance characteristics of wave rotors of straight or cambered channel profiles. The purpose here is to introduce and validate a rapid but reliable method of modeling the performance of a power-generating wave rotor where little such insight exists in open literature. The model numerically solves the laminar one-dimensional (1D) Navier–Stokes equations using a two-step Richtmyer time variation diminishing (TVD) scheme with minmod flux limiter. Additional source terms account for viscous losses, wall heat transfer, flow leakage between rotor and stator endplates as well as torque generation through momentum change. Model validation was conducted in two steps. First of all, unsteady and steady predictive capabilities were tested on three-port pressure divider rotors from open literature. The results show that both steady port flow conditions as well as the wave action within the rotor can be predicted with good agreement. Further validation was done on an in-house developed and experimentally tested four-port, three-cycle, throughflow microwave rotor turbine featuring symmetrically cambered passage walls aimed at delivering approximately 500 W of shaft power. The numerical results depict trends for pressure ratio, shaft power, and outlet temperature reasonably well. However, the results also highlight the need to accurately measure leakage gaps when the machine is running in thermal equilibrium.

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