بررسی تاثیر زاویه واگرایی حوضچه آرامش و موقعیت آب‌پایه بر خصوصیات پرش هیدرولیکی با مدلسازی عددی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، واحد علوم تحقیقات، دانشگاه آزاد اسلامی، تهران ، ایران

2 گروه مهندسی عمران، واحد لامرد، دانشگاه آزاد اسلامی، تهران ، ایران

3 گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه خوارزمی، تهران، ایران

چکیده

حوضچه‎های آرامش واگرا به دلیل کارایی هیدرولیکی قابل‎قبول و داشتن نقش تبدیل بین سازه بالادست و پایین دست، مورد توجه طراحان هستند. در مقاله حاضر به کمک شبیه‌سازی عددی در نرم‌افزار فلوئنت، تاثیر آب‎پایه انتهایی بر مشخصات پرش هیدرولیکی و استهلاک انرژی در حوضچه‌های آرامش واگرای تدریجی مطالعه می‌گردد. برای انجام این کار حوضچه‌ای با دو زاویه مختلف واگرایی و چهار موقعیت مختلف آب‌پایه در محدوده عدد فرود 4 تا 8 مدل‌سازی شد. مطابق نتایج با افزایش میزان واگرایی، عمق ثانویه و طول پرش کاهش و استهلاک انرژی افزایش می‌یابد. هم‌چنین هرچه آب‎پایه به ابتدای حوضچه نزدیک‌تر باشد عمق ثانویه، طول پرش و استهلاک انرژی کم‌تر و در نقاط نزدیک، پرش ایجاد شده نوسانی خواهد بود. بر اساس نتایج کمی، در یک واگرایی مشخص، موقعیت آب‎پایه می‎تواند تا 20% کاهش عمق ثانویه، تا 90% افزایش میزان استهلاک انرژی و تا 26% کاهش طول پرش را به همراه داشته باشد. 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical Simulation of Effect of Expansion Angle and End-sill Location on the Hydraulic Jump in Gradually Expanding Stilling Basins

نویسندگان [English]

  • F. Hooshyaripor 1
  • M. Dehghan 2
  • S.H. Mohajeri 3
1 Civil Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Civil Engineering Department, Lamerd Branch, Islamic Azad University, Fars, Iran
3 Civil Engineering Department, Faculty of Engineering, Kharazmi University, Tehran, Iran
چکیده [English]

Expanding stilling basins not only are effective energy dissipators, but also appropriate translations between hydraulic structures. Hence, the present study aims at numerical simulation of the effect of end-sill location on the energy dissipation. Doing so, Fluent software was employed and hydraulic jump under two divergence angels and four end-sill locations in the range of 4 to 8 Froude number was examined. According to the results, for larger expansion angles, the sequent depth and jump length are lower and energy dissipation is much more. Moreover, as the end-sill closes to the basin’s entrance, the lower sequent depth, shorter jump, and less energy dissipation are observed. For very close locations more instability in the flow surface are seen. Results showed that for a given expansion angel, improving the location of the end-sill can decease 20% the conjugate depth, enhance 90% the amount of energy dissipation, and reduce 26% the jump length.

کلیدواژه‌ها [English]

  • Hydraulic Jump
  • Energy Dissipation
  • Jump Length
  • Conjugate Depth
  • Fluent

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 51، شماره 1
فروردین و اردیبهشت 1398
صفحه 85-98

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