Design of a contra-rotating marine current turbine

Joseph Andrew Clarke, Gary Connor, Andrew Grant, Cameron Johnstone

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

A contra-rotating marine current turbine has a number of attractive features: nearzero reactive torque on the support structure, near-zero swirl in the wake, and high relative inter-rotor rotational speeds. Modified blade element modelling theory has been used to design and predict the characteristics of such a turbine, and a model turbine and test rig have been constructed. Tests in a towing tank demonstrated the feasibility of the concept. Power coefficients were high for such a small model and in excellent agreement with predictions, confirming the accuracy of the computational modelling procedures. Highfrequency blade loading data were obtained in the course of the experiments. These show the anticipated dynamic components for a contra-rotating machine. Flow visualization of the wake verified the lack of swirl behind the turbine. A larger machine is presently under construction for sea trials.
LanguageEnglish
Title of host publicationProceedings of the 6th European Wave and Tidal Energy Conference
Publication statusPublished - 2005

Fingerprint

Ocean currents
Turbines
Ship model tanks
Flow visualization
Turbomachine blades
Torque
Rotors
Experiments

Keywords

  • marine currents
  • turbine
  • contra-rotating
  • model tests

Cite this

Clarke, J. A., Connor, G., Grant, A., & Johnstone, C. (2005). Design of a contra-rotating marine current turbine. In Proceedings of the 6th European Wave and Tidal Energy Conference
Clarke, Joseph Andrew ; Connor, Gary ; Grant, Andrew ; Johnstone, Cameron. / Design of a contra-rotating marine current turbine. Proceedings of the 6th European Wave and Tidal Energy Conference. 2005.
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Clarke, JA, Connor, G, Grant, A & Johnstone, C 2005, Design of a contra-rotating marine current turbine. in Proceedings of the 6th European Wave and Tidal Energy Conference.

Design of a contra-rotating marine current turbine. / Clarke, Joseph Andrew; Connor, Gary; Grant, Andrew; Johnstone, Cameron.

Proceedings of the 6th European Wave and Tidal Energy Conference. 2005.

Research output: Chapter in Book/Report/Conference proceedingChapter

TY - CHAP

T1 - Design of a contra-rotating marine current turbine

AU - Clarke, Joseph Andrew

AU - Connor, Gary

AU - Grant, Andrew

AU - Johnstone, Cameron

PY - 2005

Y1 - 2005

N2 - A contra-rotating marine current turbine has a number of attractive features: nearzero reactive torque on the support structure, near-zero swirl in the wake, and high relative inter-rotor rotational speeds. Modified blade element modelling theory has been used to design and predict the characteristics of such a turbine, and a model turbine and test rig have been constructed. Tests in a towing tank demonstrated the feasibility of the concept. Power coefficients were high for such a small model and in excellent agreement with predictions, confirming the accuracy of the computational modelling procedures. Highfrequency blade loading data were obtained in the course of the experiments. These show the anticipated dynamic components for a contra-rotating machine. Flow visualization of the wake verified the lack of swirl behind the turbine. A larger machine is presently under construction for sea trials.

AB - A contra-rotating marine current turbine has a number of attractive features: nearzero reactive torque on the support structure, near-zero swirl in the wake, and high relative inter-rotor rotational speeds. Modified blade element modelling theory has been used to design and predict the characteristics of such a turbine, and a model turbine and test rig have been constructed. Tests in a towing tank demonstrated the feasibility of the concept. Power coefficients were high for such a small model and in excellent agreement with predictions, confirming the accuracy of the computational modelling procedures. Highfrequency blade loading data were obtained in the course of the experiments. These show the anticipated dynamic components for a contra-rotating machine. Flow visualization of the wake verified the lack of swirl behind the turbine. A larger machine is presently under construction for sea trials.

KW - marine currents

KW - turbine

KW - contra-rotating

KW - model tests

UR - http://dx.doi.org/10.1243/09576509JPE296

M3 - Chapter

SN - 094764942-5

BT - Proceedings of the 6th European Wave and Tidal Energy Conference

ER -

Clarke JA, Connor G, Grant A, Johnstone C. Design of a contra-rotating marine current turbine. In Proceedings of the 6th European Wave and Tidal Energy Conference. 2005