Experimental Investigation of Super Critical Flows in Open-Channels Contraction with Trapezoidal and Rectangular Sections

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Shoja Talatapeh F.; FARSADIZADEH D.; HOSSEINZADEH DALIR A.; BEHMANESH J.; NIKPOUR M.R.

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Journal: Irrigation and Drainage Structures Engineering Research Year:2019 | Volume:19 | Issue:73 Page(s): 35-50

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Title

Experimental Investigation of Super Critical Flows in Open-Channels Contraction with Trapezoidal and Rectangular Sections

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Keywords

Convergence RatioQ1

Shock WavesQ1

Side Slope AngleQ1

Abstract

In the present research, height and velocity of Shock Waves in contractions of open-channel with trapezoidal and rectangular sections was investigated using experimental models. For this purpose, length of transition (0. 5m), Convergence Ratio (1/2, 1/3 and 1/4) and Side Slope Angle (45º , 60º , 70º and 90º ) were considered as geometric variables of the experiments. Also 4 Froude number was assumed as a hydraulic variable of the experiments in the range of 3. 25-9. 23. Analysis of free surface and velocity profiles of Shock Waves showed that in general, the increasing of Side Slope Angle of the transition wall, reduction of Convergence Ratio, and increasing of Froude number have a direct relationship with the increasing height and velocity of Shock Waves. The results showed that in the contraction with trapezoidal section with the Convergence Ratio (1/2) and Side Slope Angle (45º , 60º and 70º ) compared with rectangular cross-section, on average maximum height of Shock Waves respectively decreased to: 59. 34, 44. 27 and 24. 04. In the same condition, the maximum velocity of Shock Waves respectively decreased to: 37. 51, 25. 23 and 14. 67. As Executive channels mainly with a trapezoidal cross-section are building and operating, so the findings of this study can be very useful for design engineers.

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APA: Copy

Shoja Talatapeh, F., FARSADIZADEH, D., HOSSEINZADEH DALIR, A., BEHMANESH, J., & NIKPOUR, M.R.. (2019). Experimental Investigation of Super Critical Flows in Open-Channels Contraction with Trapezoidal and Rectangular Sections. IRRIGATION AND DRAINAGE STRUCTURES ENGINEERING RESEARCH , 19(73 ), 35-50. SID. https://sid.ir/paper/406637/en

Vancouver: Copy

Shoja Talatapeh F., FARSADIZADEH D., HOSSEINZADEH DALIR A., BEHMANESH J., NIKPOUR M.R.. Experimental Investigation of Super Critical Flows in Open-Channels Contraction with Trapezoidal and Rectangular Sections. IRRIGATION AND DRAINAGE STRUCTURES ENGINEERING RESEARCH [Internet]. 2019;19(73 ):35-50. Available from: https://sid.ir/paper/406637/en

IEEE: Copy

F. Shoja Talatapeh, D. FARSADIZADEH, A. HOSSEINZADEH DALIR, J. BEHMANESH, and M.R. NIKPOUR, “Experimental Investigation of Super Critical Flows in Open-Channels Contraction with Trapezoidal and Rectangular Sections,” IRRIGATION AND DRAINAGE STRUCTURES ENGINEERING RESEARCH , vol. 19, no. 73 , pp. 35–50, 2019, [Online]. Available: https://sid.ir/paper/406637/en

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