14831

1420 دكتري

دكتري

آبياري و زهكشي

اصفهان : دانشگاه صنعتي اصفهان

1398

[هجده]، 181 ص.: مصور، جدول، نمودار

منوچهر حيدرپور، جهانگير عابدي كوپايي

جهانشير محمدزاده هابيلي

روح الله فتاحي، سعيد سلطاني، محمد شايان نژاد

1398/05/08

كتابنامه

مهندسي آب

مهندسي كشاورزي

1398/05/08

2550697

Experimental analytical and numerical study of hydraulic jump in stilling basin with adverse slope rough bed and positive step Nahid Pourabdollah Ghahfarokhi n pourabdollah@ag iut ac ir Jul 16 2019 Department of Water Engineering Isfahan University of Technology Isfahan 84156 83111 Iran 1st Supervisor Manouchehr Heidarpour heidar@cc iut ac ir 2nd Supervisor Jahangir Abedi Koupai koupai@cc iut ac ir Professor of Water Engineering Department of Water Engineering College of Agriculture IsfahanUniversity of Technology Professor of Water Engineering Department of Water Engineering College of Agriculture IsfahanUniversity of TechnologyAbstractHydraulic jump primarily serve as an excess energy dissipater on the downstream of gates spillways etc Although several studies have been previously carried out to address theeffect of applying the adverse slope and the rough bed on controlling the hydraulic jump no study has yet been done on the simultaneous application of them with the positive step In this study the hydraulic jump characteristics were investigated over three adverse slopes three rough beds t and three heights of positive step z The number of free andsubmerged hydraulic jump experiments was 576 and 192 respectively which carried out inFroude numbers ranging from 4 to 10 The results of the free jump are as follows Theresults showed that the reduction in D2 D1 Lj and Lr was 33 47 and 39 1 more than that inthe classical jump respectively Also the optimum value of t D1 and z D1 was 3 0 68and 1 08 respectively Furthermore the average of the dimensionless depth deficitparameter D was 0 28 The increase in the height of positive step led to the raise of theenergy loss but its effect was less as compared to roughness Finally the average ofenergy loss in the rough bed the adverse slope and the positive step was 27 more thanthat in the classical jump Based on the results the thickness of boundary layer was equal to0 71 Also the value of the shear force coefficient was on average 12 4 times of the shearforce coefficient in smooth beds According to the results the presence of bed roughness positive step and adverse bed slope increase the shear stress and as a result decrease thepressure oscillations Therefore the factors of adverse bed slope rough bed and positivestep reduced the x compared to that of the classical condition Also the dimensionlesspressure oscillations coefficient was decreased by 64 7 compared to that of the classicaljump In addition the minimum cavitation factor was equal to 3 87 which indicates that thecavitation phenomenon does not occur Moreover the results of the submerged hydraulicjumps are as follows The results showed that in each special Froude number the length of

منوچهر حيدرپور، جهانگير عابدي كوپايي

جهانشير محمدزاده هابيلي

روح الله فتاحي، سعيد سلطاني، محمد شايان نژاد