EFFECTS OF ABRUPT AND GRADUAL EXPANSION OF RECTANGULAR SECTION ON HYDRAULIC JUMP CHARACTERISTICS

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MOVAHEDAN MOHAMMAD; DADMEHR REZA

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: Iranian Journal of Irrigation and Drainage Year:2009 | Volume:3 | Issue:1 Page(s): 101-112

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Title

EFFECTS OF ABRUPT AND GRADUAL EXPANSION OF RECTANGULAR SECTION ON HYDRAULIC JUMP CHARACTERISTICS

Author(s)

MOVAHEDAN MOHAMMAD | DADMEHR REZA | Issue Writer Certificate

Keywords

EXPANDED HYDRAULICJUMPQ3

DIVERGENCE ANGLEQ2

EXPANION RATIOQ3

HYDRAULIC JUMP EFFICIENCYQ3

Abstract

Optimum and effective operation of classical hydraulic jump in irrigation and drainage networks needs appropriate tail water in downstream of the stilling basins. FOi:any reason whether downstream tail water of hydraulic structure is less tail water than classical jump's one, establishing 01 expansion in flow section is an appropriate solution for decreasing necessary tail water depth, which can reduce the cost of stilling basin construction too. In this research, hydraulic jump characteristics were experimentally investigated in rectangular section with abrupt and gradual expansion. Abrupt and gradual expansions (30°, 45°, 60°, 75°,90°) for three expansion ratios (downstream channel width to upstream) of 1.5, 2.5, 5 were installed in the rectangular channel (in a flume with 6x1x0.7 m long, width and height respectively). For different Froud numbers of flow, hydraulic jump characteristics were measured in these sections and the results were analyzed. Asymmetric vortices (clockwise and non-clockwise) associated with jump, established in the left and right hand of the jump, as flow passed through the expanded section in which their size and rotation velocity were completely different. Hydraulic jump characteristics including secondary depth, length and depth of jump, radius and rolling velocity of the vortices were investigated. The results of this research showed that decreasing DIVERGENCE ANGLE in different expansion ratios, decreased undesirable characteristics of spatial and transitional jumps in which, finally their conditions could be better than the characteristics of classical jump. However, for any expansion ratio, modifying DIVERGENCE ANGLE nom 90° to 30°, considerably affected the secondary depth (related to classical jump), but sequent depth ratio does not significantly modify. As expansion ratio and DIVERGENCE ANGLE decrease, expanded jump has shorter length related to classical jump. Hydraulic jumps in expanded section always have more efficiency than classical jump and with change of DIVERGENCE ANGLE for constant expansion ratio; this efficiency does not modify significantly. Finally, the optimum conditions of expanded jump could occur with expansion ratio of 2 and DIVERGENCE ANGLE of 60°.

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APA: Copy

MOVAHEDAN, MOHAMMAD, & DADMEHR, REZA. (2009). EFFECTS OF ABRUPT AND GRADUAL EXPANSION OF RECTANGULAR SECTION ON HYDRAULIC JUMP CHARACTERISTICS. IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE, 3(1), 101-112. SID. https://sid.ir/paper/131638/en

Vancouver: Copy

MOVAHEDAN MOHAMMAD, DADMEHR REZA. EFFECTS OF ABRUPT AND GRADUAL EXPANSION OF RECTANGULAR SECTION ON HYDRAULIC JUMP CHARACTERISTICS. IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE[Internet]. 2009;3(1):101-112. Available from: https://sid.ir/paper/131638/en

IEEE: Copy

MOHAMMAD MOVAHEDAN, and REZA DADMEHR, “EFFECTS OF ABRUPT AND GRADUAL EXPANSION OF RECTANGULAR SECTION ON HYDRAULIC JUMP CHARACTERISTICS,” IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE, vol. 3, no. 1, pp. 101–112, 2009, [Online]. Available: https://sid.ir/paper/131638/en

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