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Journal of Thermal Science

, Volume 23, Issue 3, pp 239–245 | Cite as

Study on an undershot cross-flow water turbine

  • Yasuyuki Nishi
  • Terumi Inagaki
  • Yanrong Li
  • Ryota Omiya
  • Junichiro Fukutomi
Article

Abstract

This study aims to develop a water turbine suitable for ultra-low heads in open channels, with the end goal being the effective utilization of unutilized hydroelectric energy in agricultural water channels. We performed tests by applying a cross-flow runner to an open channel as an undershot water turbine while attempting to simplify the structure and eliminate the casing. We experimentally investigated the flow fields and performance of water turbines in states where the flow rate was constant for the undershot cross-flow water turbine mentioned above. In addition, we compared existing undershot water turbines with our undershot cross-flow water turbine after attaching a bottom plate to the runner. From the results, we were able to clarify the following. Although the effective head for cross-flow runners with no bottom plate was lower than those found in existing runners equipped with a bottom plate, the power output is greater in the high rotational speed range because of the high turbine efficiency. Also, the runner with no bottom plate differed from runners that had a bottom plate in that no water was being wound up by the blades or retained between the blades, and the former received twice the flow due to the flow-through effect. As a result, the turbine efficiency was greater for runners with no bottom plate in the full rotational speed range compared with that found in runners that had a bottom plate.

Keywords

Water Turbine Cross-Flow Turbine Open Channel Performance Flow Visualization 

Nomenclature

B

channel width (m)

b

runner width (m)

D

runner diameter (m)

Fr

Froude number

g

gravitational acceleration (m/s2)

H

effective head (m)

h

depth of water (m)

n

rotational speed (min−1)

P

power (W) = 2GPnT/60

Q

flow rate (m3/s)

T

torque (N·m)

v

absolute velocity (m/s)

Greek letters

βb

blade angle (°)

Γ

clearance between runner and side walls (m)

δ

clearance between runner and floor (m)

η

turbine efficiency = P/ ρgQH

ρ

fluid density (kg/m3)

Subscripts

1

inner circumference of runner

2

outer circumference of runner

3

upper stream

4

lower stream

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References

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Copyright information

© Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Yasuyuki Nishi
    • 1
  • Terumi Inagaki
    • 1
  • Yanrong Li
    • 1
  • Ryota Omiya
    • 2
  • Junichiro Fukutomi
    • 3
  1. 1.Department of Mechanical EngineeringIbaraki UniversityHitachi-shi, IbarakiJapan
  2. 2.Graduate School of Science and EngineeringIbaraki UniversityHitachi-shi, IbarakiJapan
  3. 3.Institute of Technology and ScienceThe University of TokushimaTokushima-shi, TokushimaJapan

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