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VARIATION OF AIR CONCENTRATION IN SKI JUMP JETS

Year 2020, Volume: 7 Issue: 13, 75 - 88, 28.12.2020

Abstract

Scour always be a significant problem for the stability and safety of a dam. Water jet issued from flip bucket of a dam creates an air-water mixture and finally plunges at the downstream of a dam. Depending on the discharge, total head, thickness of the water body, aeration conditions and geometrical features of the flip bucket, the jet is dispersed in air. It is obvious that air concentration is inversely proportional with the dynamic pressures at impingement area of the water jet coming from the flip bucket of spillway of a dam. Impact of the ski jump jet at the impingement point may be reduced depending on the air concentration of the jet. In this study, experimental and numerical assessments are performed to analyze the distribution of the air into the ski jump jet depending on the dynamic pressures at the impingement point. The impact of the ski jump jet is analyzed and air percentages are defined into the jet according to dynamic pressure measurements using pressure transmitters at the impingement area. By doing so, aeration characteristics and impact values of water jets are revealed to generate reliable scour estimates for future researchers.

References

  • [1] Khatsuria RM. Hydraulics of Spillways and Energy Dissipators, CRC Press, Taylor & Francis Group, NW, 2005; ISBN: 978-0-203-99698-0.
  • [2] Rajan BH, Shivashankara Rao KN. Design of trajectory buckets. J. Irrig. Power India 1980; 37(1): 63–76, ISSN : 0974-4711.
  • [3] Heller V, Hager WH, Minor HE. Ski jump hydraulics, J. Hydraul. Eng. 2005; 131(5):347–355, DOI:10.1061/(ASCE)0733-9429(2005)131:5(347).
  • [4] Steiner R, Heller V, Hager WH, Minor HE. Deflector ski jump hydraulics, Journal of Hydraulic Engineering 2008; 5(134): 562-571, DOI: 10.1061/(ASCE)0733-9429(2008)134:5(562).
  • [5] Chanson H. Air Bubble Entrainment in Turbulent Water Jets Discharging into the Atmosphere, Australian Civil/Structural Engineering Transactions 1996; 1(39).
  • [6] Schmocker L, Pfister M, Hager WH, Minor HE. Aeration characteristics of ski jump jets, ASCE Journal. of Hydraulic Engineering 2008; 134(1):90-97.
  • [7] Kawakami K. A Study on the Computation of Horizontal Distance of Jet Issued from Ski-Jump Spillway, Proceedings of the Japan Society of Civil Engineers 1973; 1973(219):37-44, Doi: http://doi.org/10.2208/jscej1969.1973.219_37.
  • [8] Aydin I, Göğüş M, Altan-Sakarya AB, Köken M. Laleli Dam and HEPP Spillway Hydraulic Model Studies, Hydromechanics Laboratory, Civil Engineering Department, 2012, METU.
  • [9] Data Acquisition (DAQ) Software retrieved from: http://turkey.ni.com/
  • [10] Launder BE, Spalding DB. The numerical computation of turbulent flows, Computer Methods in Applied Mechanics and Engng. 1974; 3(2):269–289, DOI:10.1016/0045-7825(74)90029-2.
  • [11] Wilcox DC. Turbulence modelling for CFD, DCW Industries, Inc. 2000, La Canada CA, DOI: 10.1017/S0022112095211388.
  • [12] Zhang N, Chato DJ, McQuillen JB, Motil BJ, Chao DF. CFD simulation of pressure drops in liquid acquisition device channel with sub-cooled oxygen, World Academy of Science, Engineering and Technology 2012; 58:1180-1185, DOI: 10.1016/j.ijhydene.2014.01.035.
  • [13] Speziale CG. Analytical methods for the development of Reynolds-stress closures in turbulence, Annual Review of Fluid Mechanics 1991; 23:107–157, DOI: 10.1146/annurev.fl.23.010191.000543.
  • [14] Flow 3D, v10.1 User Manuel, 2012, Available at:http://www.easysimulation.com/public/flow3dcast/documentation/FLOW-3D_Cast_3.2_Manual.pdf

DOLUSAVAKLARDA SIÇRATMA EŞİĞİNDEN ÇIKAN SU JETİ HAVA KONSANTRASYONUNUN DEĞİŞİMİ

Year 2020, Volume: 7 Issue: 13, 75 - 88, 28.12.2020

Abstract

Baraj stabilitesi ve güvenliği için baraj mansabındaki oyulma her zaman önemli bir tehdit olmuştur. Sıçratma eşiğinden çıkan su jeti hava-su karışımı oluşturur ve sonrasında barajın mansap tarafına düşer. Su jeti debi, toplam enerji yüksekliği, su jetinin büyüklüğü, havalanma koşulları ve sıçratma eşiğinin geometrik özellikleri gibi parametrelere bağlı olarak havada yayılır. Su jetinin düştüğü noktada oluşan dinamik basınç dağılımı jetin içerisinde bulunan hava konsatrasyonu ile ters orantılı olarak değişir. Buna göre, su jetinin düştüğü noktadaki oyulma büyüklüğü jetin hava konsantrasyonunun artırılması ile düşebilir. Bu çalışmada, su jeti içerisindeki hava konsantrasyonu, nehir yatağında oluşan dinamik basınçların deneysel ve nümerik değerlendirmesi yapılarak incelenmiştir. Su jetinin düşme noktasındaki etkisi basınç sensörleri ile belirlenen dinamik basınçlar ile ölçülmüş ve hava konsantrasyonu yüzdeleri buna görebelirlenmiştir. Böylece, gelecekteki çalışmalara kaynak oluşturabilecek güvenilir bir su jeti hava konsantrasyonu analizi bu çalışma ile sağlanmıştır.

References

  • [1] Khatsuria RM. Hydraulics of Spillways and Energy Dissipators, CRC Press, Taylor & Francis Group, NW, 2005; ISBN: 978-0-203-99698-0.
  • [2] Rajan BH, Shivashankara Rao KN. Design of trajectory buckets. J. Irrig. Power India 1980; 37(1): 63–76, ISSN : 0974-4711.
  • [3] Heller V, Hager WH, Minor HE. Ski jump hydraulics, J. Hydraul. Eng. 2005; 131(5):347–355, DOI:10.1061/(ASCE)0733-9429(2005)131:5(347).
  • [4] Steiner R, Heller V, Hager WH, Minor HE. Deflector ski jump hydraulics, Journal of Hydraulic Engineering 2008; 5(134): 562-571, DOI: 10.1061/(ASCE)0733-9429(2008)134:5(562).
  • [5] Chanson H. Air Bubble Entrainment in Turbulent Water Jets Discharging into the Atmosphere, Australian Civil/Structural Engineering Transactions 1996; 1(39).
  • [6] Schmocker L, Pfister M, Hager WH, Minor HE. Aeration characteristics of ski jump jets, ASCE Journal. of Hydraulic Engineering 2008; 134(1):90-97.
  • [7] Kawakami K. A Study on the Computation of Horizontal Distance of Jet Issued from Ski-Jump Spillway, Proceedings of the Japan Society of Civil Engineers 1973; 1973(219):37-44, Doi: http://doi.org/10.2208/jscej1969.1973.219_37.
  • [8] Aydin I, Göğüş M, Altan-Sakarya AB, Köken M. Laleli Dam and HEPP Spillway Hydraulic Model Studies, Hydromechanics Laboratory, Civil Engineering Department, 2012, METU.
  • [9] Data Acquisition (DAQ) Software retrieved from: http://turkey.ni.com/
  • [10] Launder BE, Spalding DB. The numerical computation of turbulent flows, Computer Methods in Applied Mechanics and Engng. 1974; 3(2):269–289, DOI:10.1016/0045-7825(74)90029-2.
  • [11] Wilcox DC. Turbulence modelling for CFD, DCW Industries, Inc. 2000, La Canada CA, DOI: 10.1017/S0022112095211388.
  • [12] Zhang N, Chato DJ, McQuillen JB, Motil BJ, Chao DF. CFD simulation of pressure drops in liquid acquisition device channel with sub-cooled oxygen, World Academy of Science, Engineering and Technology 2012; 58:1180-1185, DOI: 10.1016/j.ijhydene.2014.01.035.
  • [13] Speziale CG. Analytical methods for the development of Reynolds-stress closures in turbulence, Annual Review of Fluid Mechanics 1991; 23:107–157, DOI: 10.1146/annurev.fl.23.010191.000543.
  • [14] Flow 3D, v10.1 User Manuel, 2012, Available at:http://www.easysimulation.com/public/flow3dcast/documentation/FLOW-3D_Cast_3.2_Manual.pdf
There are 14 citations in total.

Details

Primary Language English
Subjects Engineering
Journal Section Makaleler
Authors

Cüneyt Yavuz 0000-0001-9767-7234

Publication Date December 28, 2020
Submission Date June 18, 2020
Published in Issue Year 2020 Volume: 7 Issue: 13

Cite

APA Yavuz, C. (2020). VARIATION OF AIR CONCENTRATION IN SKI JUMP JETS. Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi, 7(13), 75-88.
AMA Yavuz C. VARIATION OF AIR CONCENTRATION IN SKI JUMP JETS. Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi. December 2020;7(13):75-88.
Chicago Yavuz, Cüneyt. “VARIATION OF AIR CONCENTRATION IN SKI JUMP JETS”. Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi 7, no. 13 (December 2020): 75-88.
EndNote Yavuz C (December 1, 2020) VARIATION OF AIR CONCENTRATION IN SKI JUMP JETS. Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi 7 13 75–88.
IEEE C. Yavuz, “VARIATION OF AIR CONCENTRATION IN SKI JUMP JETS”, Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi, vol. 7, no. 13, pp. 75–88, 2020.
ISNAD Yavuz, Cüneyt. “VARIATION OF AIR CONCENTRATION IN SKI JUMP JETS”. Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi 7/13 (December 2020), 75-88.
JAMA Yavuz C. VARIATION OF AIR CONCENTRATION IN SKI JUMP JETS. Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi. 2020;7:75–88.
MLA Yavuz, Cüneyt. “VARIATION OF AIR CONCENTRATION IN SKI JUMP JETS”. Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi, vol. 7, no. 13, 2020, pp. 75-88.
Vancouver Yavuz C. VARIATION OF AIR CONCENTRATION IN SKI JUMP JETS. Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi. 2020;7(13):75-88.