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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper seeks to introduce a quasi one-dimensional 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 model numerically solves the laminar one-dimensional Navier-Stokes equations using a two-step Richtmyer 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 threeport 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 micro wave rotor turbine featuring symmetrically cambered passage walls aimed at delivering approximately 500W of shaft power. The numerical results depict trends for pressure ratio, shaft power and outlet temperature reasonably well. However, the results further tend to overpredict the effect of changes in boundary conditions and highlight the need for accurately measured leakage gaps when the machine is running in thermal equilibrium.
Original languageEnglish
Title of host publicationProceedings of ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition
Publication statusAccepted/In press - 6 Feb 2019
EventASME Turbo Expo 2019 - Arizona, Phoenix, USA United States
Duration: 17 Jun 201921 Jun 2019
https://event.asme.org/Events/media/library/resources/turbo/Turbo-Expo-2019-Program.pdf

Conference

ConferenceASME Turbo Expo 2019
CountryUSA United States
CityPhoenix
Period17/06/1921/06/19
Internet address

Cite this

Tuechler, S., & Copeland, C. (Accepted/In press). Validation of a Numerical Quasi One-Dimensional Model for Wave Rotor Turbines with Curved Channels. In Proceedings of ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition [GT2019-90868]

Validation of a Numerical Quasi One-Dimensional Model for Wave Rotor Turbines with Curved Channels. / Tuechler, Stefan; Copeland, Colin.

Proceedings of ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. 2019. GT2019-90868.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Tuechler, S & Copeland, C 2019, Validation of a Numerical Quasi One-Dimensional Model for Wave Rotor Turbines with Curved Channels. in Proceedings of ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition., GT2019-90868, ASME Turbo Expo 2019, Phoenix, USA United States, 17/06/19.
Tuechler S, Copeland C. Validation of a Numerical Quasi One-Dimensional Model for Wave Rotor Turbines with Curved Channels. In Proceedings of ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. 2019. GT2019-90868
Tuechler, Stefan ; Copeland, Colin. / Validation of a Numerical Quasi One-Dimensional Model for Wave Rotor Turbines with Curved Channels. Proceedings of ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. 2019.
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abstract = "This paper seeks to introduce a quasi one-dimensional 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 model numerically solves the laminar one-dimensional Navier-Stokes equations using a two-step Richtmyer 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 threeport 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 micro wave rotor turbine featuring symmetrically cambered passage walls aimed at delivering approximately 500W of shaft power. The numerical results depict trends for pressure ratio, shaft power and outlet temperature reasonably well. However, the results further tend to overpredict the effect of changes in boundary conditions and highlight the need for accurately measured leakage gaps when the machine is running in thermal equilibrium.",
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N2 - This paper seeks to introduce a quasi one-dimensional 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 model numerically solves the laminar one-dimensional Navier-Stokes equations using a two-step Richtmyer 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 threeport 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 micro wave rotor turbine featuring symmetrically cambered passage walls aimed at delivering approximately 500W of shaft power. The numerical results depict trends for pressure ratio, shaft power and outlet temperature reasonably well. However, the results further tend to overpredict the effect of changes in boundary conditions and highlight the need for accurately measured leakage gaps when the machine is running in thermal equilibrium.

AB - This paper seeks to introduce a quasi one-dimensional 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 model numerically solves the laminar one-dimensional Navier-Stokes equations using a two-step Richtmyer 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 threeport 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 micro wave rotor turbine featuring symmetrically cambered passage walls aimed at delivering approximately 500W of shaft power. The numerical results depict trends for pressure ratio, shaft power and outlet temperature reasonably well. However, the results further tend to overpredict the effect of changes in boundary conditions and highlight the need for accurately measured leakage gaps when the machine is running in thermal equilibrium.

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