بررسی تأثیر سرعت بر جدایی ستون آب با بکارگیری روش‌های CFD

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
مهدی اژدری مقدم 1
سکینه صفری 2
عبدالحمید بحرپیما 3
محمد گیوه چی 4
1 استاد ، گروه عمران، دانشگاه سیستان‌وبلوچستان، زاهدان، ایران
2 دانشجوی دکترا، گروه عمران، دانشگاه سیستان‌وبلوچستان، زاهدان، ایران
3 دانشیار، گروه عمران، دانشگاه سیستان‌وبلوچستان، زاهدان، ایران
4 استادیار، گروه عمران، دانشگاه سیستان‌وبلوچستان، زاهدان، ایران
A-10-11309-2
چکیده
پدیده جدایی ستون آب یکی از رژیم‌های جریان گذرا می­باشد که تحت شرایطی مانند بسته شدن ناگهانی شیر یا خاموشی پمپ در شبکه آبرسانی ایجاد می‌گردد. نوسانات فشاری شدید و خسارات ناشی از پدیده مذکور شناسایی و ارائه راهکار جلوگیری از آن را الزامی می­کند. در همین راستا در این مقاله با استفاده از روش دینامیک سیالات محاسباتی، به بررسی امکان رخ دادن جدایی ستون آب در یک شبکه آبرسانی حلقوی پرداخته شده است. در ادامه تأثیر سرعت ورودی بر فشار‌های ایجاد شده ناشی از جدایی ستون آب مورد بررسی قرار گرفت. برای اعتبار‌سنجی نرم‌افزار، سیستم حلقوی ارائه شده توسط وانگ و همکاران (2017) انتخاب گردید. بعد از اطمینان از کارایی نرم‌افزار برای مدل کردن پدیده مذکور، شبیه‌سازی با سرعت‌های مختلف انجام گرفت. بررسی نتایج شبیه‌سازی­ها بیانگر رخ دادن جدایی ستون آب در شبکه موردنظر بود. همچنین نتایج حاکی از آن بود که با افزایش سرعت ورودی مقدار ماکزیمم فشار در شبکه افزایش و مقدار مینیمم آن کاهش می‌یابد. به گونه‌ای که با افزایش 12 درصدی سرعت ورودی مقدار فشار ماکزیمم 8/11 درصد و مقدار مینیمم 26/14 درصد تغییر می‌کنند. به بیان دیگر، با کنترل سرعت به عنوان عاملی موثر بر نوسانات فشار جدایی ستون آب، می­توان از ایجاد این پدیده و خسارات ناشی از آن جلوگیری می‌گردد.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Investigating the effect of Velocity on Water Column Separation using CFD Methods

نویسندگان English

Mehdi Azhdary Moghaddam 1
sakineh safari 2
Abdul Hamid bahrpeyma 3
Mohammad Givehchi 4
1 Professor, Department of Civil Engineering, University of Sistan and Baluchistan, Zahedan, Iran
2 PhD student, Department of Civil Engineering, University of Sistan and Baluchistan, Zahedan, Iran
3 Associate Professor, Department of Civil Engineering, Sistan-Baluchistan University, Zahedan, Iran
4 Assistant Professor, Department of Civil Engineering, Sistan-Baluchistan University, Zahedan, Iran
چکیده English

The Water Column Separation phenomenon is one of the transient flow regimes, which is created under conditions such as the sudden closing of the valve or the shutdown of the pump in the water supply network. Hard pressure fluctuations and damages caused by the mentioned phenomenon require identifying and providing a solution to prevent it. By this purpose, the present article investigates the possibility of Water Column Separation in a Loop Water Supply Network using Computational Fluid Dynamics method. Next, the Effect of the inlet velocity on the pressures created due to the Water Column Separation was investigated. For software validation, the Loop system provided by Wang et al. (2017) was selected. After ensuring the efficiency of the software to model the phenomenon of Water Column Separation, simulation was performed at different speeds. Checking the simulation results indicated the occurrence of Water Column Separation in the Intended Network. Also, the Results indicated that with the increase of the input Velocity, the maximum value of the Pressure in the Network increases and its minimum value decreases. In such a way that with a 12% increase in the input velocity, the maximum pressure value changes by 11.8% and the minimum value by 14.26%. In general, it can be said that by controlling the Velocity as an effective factor on the pressure fluctuations of the Water Column Separation, this phenomenon and the resulting damages are prevented.

کلیدواژه‌ها English

Transient Flow
Water Column Separation
Velocity
Loop System
CFD
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مهندسی عمران مدرس
دوره 24، شماره 2
خرداد و تیر 1403
صفحه 65-77