مطالعه عددي دبي جريان در ورودي آبگير با كمك آبشكن L شكل

Numerical Study of discharge of flow at Inlet of the Intake Using L-Shaped Groin

رودﺧﺎﻧﻪﻫﺎ ﯾﮑﯽ از ﻣﻨﺎﺑﻊ اﺻﻠﯽ ﺗﺄﻣﯿﻦﮐﻨﻨﺪه آب ﺷﯿﺮﯾﻦ ﺑﻪ ﺣﺴﺎب ﻣﯽآﯾﻨﺪ ﮐﻪ ﺑﺎ اﺣﺪاث آﺑﮕﯿﺮ، ﺑﺮداﺷﺖ آب از آنﻫﺎ اﻧﺠﺎم ﻣﯽﮔﯿﺮد. آﺑﮕﯿﺮﻫﺎ از ﺟﻤﻠﻪ ﺳﺎزهﻫﺎﯾﯽ ﻫﺴﺘﻨﺪ ﮐﻪ ﺑﺮاي ﺑﺮداﺷﺖ آب از رودﺧﺎﻧﻪﻫﺎ ﻃﺮاﺣﯽ و اﺟﺮا ﻣﯽﮔﺮدﻧﺪ، ﻟﺬا داﺷﺘﻦ ﺷﻨﺎﺧﺖ و آﮔﺎﻫﯽ ﮐﺎﻣﻞ ﻧﺴﺒﺖ ﺑﻪ ﻣﺴﺎﺋﻞ ﻃﺮاﺣﯽ و ﻣﺸﮑﻼﺗﯽ ﮐﻪ ﭘﺲ از اﺟﺮا در اﯾﻦ ﺳﺎزه ﺣﺎدث ﻣﯽ ﺷﻮد، ﻣﯽﺗﻮاﻧﺪ ﮐﻤﮏ ﻣﺆﺛﺮ و ﺷﺎﯾﺎﻧﯽ در اﻣﺮ ﺑﻬﯿﻨﻪﺳﺎزي ﺑﺮداﺷﺖ آب از رودﺧﺎﻧﻪﻫﺎ ﺑﺎﺷﺪ. در ﺗﺤﻘﯿﻖ ﺣﺎﺿﺮ ﺑﻪ ﻣﻨﻈﻮر ﺑﺮرﺳﯽ ﺗﺎﺛﯿﺮ آﺑﺸﮑﻦ Lﺷﮑﻞ ﺑﺮ ﺷﺮاﯾﻂ ﻫﯿﺪروﻟﯿﮑﯽ ﺟﺮﯾﺎن در آﺑﮕﯿﺮﻫﺎ از ﻣﺪل رﯾﺎﺿﯽ -FLOW 3Dاﺳﺘﻔﺎده ﺷﺪ. ﻧﺘﺎﯾﺞ ﺣﺎﺻﻞ از آزﻣﺎﯾﺶﻫﺎ ﻧﺸﺎن ﻣﯽ دﻫﺪ ﮐﻪ ﺑﻪﻃﻮر ﻣﺘﻮﺳﻂ ﺑﺎ ﻧﺼﺐ آﺑﺸﮑﻦ Lﺷﮑﻞ 5/70درﺻﺪ اﻓﺰاﯾﺶ دﺑﯽ اﻧﺤﺮاﻓﯽ ﺑﻪ آﺑﮕﯿﺮ ﻧﺴﺒﺖ ﺑﻪ ﻣﺪل ﺷﺎﻫﺪ را ﺑﺎﻋﺚ ﻣﯽﺷﻮد و ﺑﺎ اﻓﺰاﯾﺶ ﻃﻮل آﺑﺸﮑﻦ Lﺷﮑﻞ از 15ﺑﻪ 45درﺻﺪ، دﺑﯽ اﻧﺤﺮاﻓﯽ 5/22درﺻﺪ اﻓﺰاﯾﺶ ﯾﺎﻓﺘﻪ اﺳﺖ

Rivers are major sources of fresh water, which are exploited by means of intakes. Intakes are structures designed and built to exploit water from the rivers. Therefore, comprehensive knowledge of design circumstances as well as problems that occur after construction of such structures can contribute remarkably to optimum exploitation of water from the rivers. In the present study, the Flow-3D mathematical model is used to investigate the effects of L-shaped groins on the hydraulic conditions of the flow in the intakes. The results show that using L-shaped groin results on average in increasing the flow diverted to the intake by 70.5%, compared to the control model; and increasing length of the L-shaped groin from 15% to 45% of the flume width, shall result in increasing the diverted discharge by 22.5%.