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Journals / Turkish Journal of Civil Engineering / 2026 / Cilt: 30 Sayı: 4

Roughness Coefficient of a Highly Calcinated Penstock

Kutay Çelebioğlu(Tobb University of Economics and Technology, Hydro Energy Research Center (ETU HYDRO))0000-0001-8845-4928
Pages
9309–9325
Publication Date
2019-07-01
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

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.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:When highly calcinated water is transferred through the penstock of a hydropower plant it leaves a residue on the pipe surface.
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Key Findings & Data:Accumulated residue over time causes a change in the roughness of the pipe surface thus friction losses in the system.
💡
Conclusion & Impact: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.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:Friction factor · Surface roughness · Calcination

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.

Özet

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.

🔖

Cite This Article

Çelebioğlu, K. (2019). Roughness Coefficient of a Highly Calcinated Penstock. Turkish Journal of Civil Engineering, Cilt: 30 Sayı: 4, 9309–9325. https://doi.org/10.18400/tekderg.447265

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