Turbulence study in the vicinity of piano key weir: relevance, instrumentation, parameters and methods

Springer Science and Business Media LLC - Tập 7 - Trang 525-534 - 2015
Harinarayan Tiwari1, Nayan Sharma1
1Department of Water Resources Development and Management, Indian Institute of Technology Roorkee, Roorkee, India

Tóm tắt

This research paper focuses on the need of turbulence, instruments reliable to capture turbulence, different turbulence parameters and some advance methodology which can decompose various turbulence structures at different levels near hydraulic structures. Small-scale turbulence research has valid prospects in open channel flow. The relevance of the study is amplified as we introduce any hydraulic structure in the channel which disturbs the natural flow and creates discontinuity. To recover this discontinuity, the piano key weir (PKW) might be used with sloped keys. Constraints of empirical results in the vicinity of PKW necessitate extensive laboratory experiments with fair and reliable instrumentation techniques. Acoustic Doppler velocimeter was established to be best suited within range of some limitations using principal component analysis. Wavelet analysis is proposed to decompose the underlying turbulence structure in a better way.

Tài liệu tham khảo

Ali S, Ghani U, Latif A (2013) Study of turbulent kinetic energy and reattachment length downstream the obstruction in an open channel. Life Sci J 10(10s)

Gad-el-Hak M (1989) Flow control. Appl Mech Rev 42(10):261–293

Laugier F, Vermeulen J, Pralong J (2012) Achievement of New Innovative Labyrinth Piano Key Weir Spillways (PKW). In: Proceedings of piano key weir for in-stream storage and dam safety (pKwIsD-2012), New Delhi. New Delhi, India, pp 25–42

Nayan Sharma GS (2007) The Piano Key Weir: a New Dam Safety Solution for Enhanced Spillway Capacity. Proc Ann Conf Assoc State Dam Safety Off:113–128

Nezu, I. (1993). “Turbulence in open-channel flows.”

Ouamane A (2013) Improvement of labyrinth weirs shape. In: Proc., Labyrinth and Piano Key Weirs II—PKW 2013. CRC Press, Taylor & Francis Group, London

Sharma N, Tiwari H, Singhal GD (2012) Piano-key weir technology: a possible solution of Dam safety in narrow river and existing dams. In: Proc. Dams and Spillways in Himalayan Regions, Water Resources Department, BIS. India, pp 118–123

Simpson RL (2001) Junction flows. Ann Rev Fluid Mech 33(1):415–443

Tiwari H, Sharma N (2014) Gaps and scope of turbulence study near piano key weir (PKW). In: H. L. Tiwari, S. Suresh, and R. K. Jaiswal, (eds) Hydraulics, water resources, coastal and environmental engineering. Excellent Publishing House, Maulana Azad National Institute of Technology Bhopal. pp 486–492

Yeh Y, Cummins H (1964) Localized fluid flow measurements with an He–Ne laser spectrometer. Appl Phys Lett 4(10):176–178