Roughness Coefficient of a Highly Calcinated Penstock

Year 2019, Volume: 30 Issue: 4, 9309 - 9325, 01.07.2019

Kutay Çelebioğlu

https://doi.org/10.18400/tekderg.447265

Cited By: 1

Abstract

When highly
calcinated water is transferred through the penstock of a hydropower plant it
leaves a residue on the pipe surface. Accumulated residue over time causes a
change in the roughness of the pipe surface thus friction losses in the
system.  The effect is a change in head
and discharge relation for the turbines. A multimethodology is proposed for
determining the apparent surface roughness value (ε) by means of friction factor
f and measuring arithmetic mean deviation of the roughness profile (Ra), root
mean square roughness (Rq) and peak and valley roughness (Rz).  It is found that a surface roughness value
(ε) of 0.3mm can be used for calcinated surfaces which is much higher than
steel surfaces but smaller than concrete.

Keywords

Friction factor, Surface roughness, Calcination

Roughness Coefficient of a Highly Calcinated Penstock

Abstract

When highly calcinated water is transferred through the penstock of a hydropower plant it leaves a residue on the pipe surface. Accumulated residue over time causes a change in the roughness of the pipe surface thus friction losses in the system.  The effect is a change in head and discharge relation for the turbines. A multimethodology is proposed for determining the apparent surface roughness value (ε) by means of friction factor f and measuring arithmetic mean deviation of the roughness profile (Ra), root mean square roughness (Rq) and peak and valley roughness (Rz).  It is found that a surface roughness value (ε) of 0.3mm can be used for calcinated surfaces which is much higher than steel surfaces but smaller than concrete.

Keywords

Friction factor, surface roughness, calcination

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