Optimization of the Cooling Process of a Heavy Hydraulic Turbine Runner Band Casting in Heat Treatment

Abstract:

Hydraulic turbine band castings are susceptible to deformation in heat treatment process if their cooling is not well controlled. The coupled analysis of forced air flow and heat transfer in normalizing process of a heavy turbine band runner casting with outer diameter of 8000 mm was carried out by using ANSYS software. The band undergoes significant deformation because of uneven cooling resulted by uneven air flow around it during normalizing. The forced air flow pattern is a key factor which influences the cooling uniformity and efficiency. It is optimized by adjusting the cooling fans’ orientation relative to the casting to form cyclone around it. Consequently, cooling uniformity is improved to avoid deformation.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 1335-1338
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.1335
• Online since: June 2010
• Authors: Jin Wu Kang, Tian Jiao Wang, Hai Liang Yu, Tian You Huang, Bai Cheng Liu
• Keywords: Air Flow, Band Casting, Deformation, Heat Transfer Coefficient (HTC), Heat Treatment

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