Theoretical considerations in an approximate method for estimating the blade performance of a darrieus-type cross-flow water turbine

Akinori Furukawa, Yasuo Takamatsu, Kazuki Takenouchi

Research output: Contribution to journalArticle

Abstract

To predict the blade performance of a Darrieus-type cross-flow water turbine, aerofoil data obtained by a blade at rest in a uniform steady flow have been unavoidably used, though a Darrieus blade has a circular motion so that characters of flow around both blades are quite different. The authors presented a method which related both flow fields in a preceding paper, but it was still insufficient in its theoretical basis. Then, a complementary study on this problem was carried out by inviscid flow analysis. Calculated results showed that the fluid forces generated by velocity distribution along a Darrieus blade surface were much larger than the other additional forces created by the circular motion of a blade. It was clarified that a flow around a blade in a circular motion could be transformed approximately to a flow around a blade in a rectilinear motion by the use of an equivalent circular camber and an equivalent angle of attack, with the condition that the angle between the resultant force and camber line of the blade was mutually equal in both flow fields.

Original languageEnglish
Pages (from-to)2507-2513
Number of pages7
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Volume53
Issue number492
DOIs
Publication statusPublished - Jan 1 1987

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Cambers
cross flow
turbines
blades
Turbomachine blades
Flow fields
Turbines
estimating
Steady flow
Angle of attack
Velocity distribution
Airfoils
water
Water
camber
Fluids
flow distribution
inviscid flow
angle of attack
steady flow

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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abstract = "To predict the blade performance of a Darrieus-type cross-flow water turbine, aerofoil data obtained by a blade at rest in a uniform steady flow have been unavoidably used, though a Darrieus blade has a circular motion so that characters of flow around both blades are quite different. The authors presented a method which related both flow fields in a preceding paper, but it was still insufficient in its theoretical basis. Then, a complementary study on this problem was carried out by inviscid flow analysis. Calculated results showed that the fluid forces generated by velocity distribution along a Darrieus blade surface were much larger than the other additional forces created by the circular motion of a blade. It was clarified that a flow around a blade in a circular motion could be transformed approximately to a flow around a blade in a rectilinear motion by the use of an equivalent circular camber and an equivalent angle of attack, with the condition that the angle between the resultant force and camber line of the blade was mutually equal in both flow fields.",
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N2 - To predict the blade performance of a Darrieus-type cross-flow water turbine, aerofoil data obtained by a blade at rest in a uniform steady flow have been unavoidably used, though a Darrieus blade has a circular motion so that characters of flow around both blades are quite different. The authors presented a method which related both flow fields in a preceding paper, but it was still insufficient in its theoretical basis. Then, a complementary study on this problem was carried out by inviscid flow analysis. Calculated results showed that the fluid forces generated by velocity distribution along a Darrieus blade surface were much larger than the other additional forces created by the circular motion of a blade. It was clarified that a flow around a blade in a circular motion could be transformed approximately to a flow around a blade in a rectilinear motion by the use of an equivalent circular camber and an equivalent angle of attack, with the condition that the angle between the resultant force and camber line of the blade was mutually equal in both flow fields.

AB - To predict the blade performance of a Darrieus-type cross-flow water turbine, aerofoil data obtained by a blade at rest in a uniform steady flow have been unavoidably used, though a Darrieus blade has a circular motion so that characters of flow around both blades are quite different. The authors presented a method which related both flow fields in a preceding paper, but it was still insufficient in its theoretical basis. Then, a complementary study on this problem was carried out by inviscid flow analysis. Calculated results showed that the fluid forces generated by velocity distribution along a Darrieus blade surface were much larger than the other additional forces created by the circular motion of a blade. It was clarified that a flow around a blade in a circular motion could be transformed approximately to a flow around a blade in a rectilinear motion by the use of an equivalent circular camber and an equivalent angle of attack, with the condition that the angle between the resultant force and camber line of the blade was mutually equal in both flow fields.

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