Roughness Coefficient of a Highly Calcinated Penstock

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Teknik Dergi
Volume:30 Issue:4
Roughness Coefficient of a Highly Calcinated Penstock

Roughness Coefficient of a Highly Calcinated Penstock

Pages : 9309-9325

View : 5 | Download : 9

Publication Date : 2019-07-01

Article Type : Research Paper

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 insert ignore into journalissuearticles values(ε); by means of friction factor f and measuring arithmetic mean deviation of the roughness profile insert ignore into journalissuearticles values(Ra);, root mean square roughness insert ignore into journalissuearticles values(Rq); and peak and valley roughness insert ignore into journalissuearticles values(Rz);. It is found that a surface roughness value insert ignore into journalissuearticles values(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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