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افزایش راندمان رسوب شویی تحت فشار مخازن با اتصال سازۀ PBC به دریچۀ تخلیۀ رسوب | ||
| تحقیقات مهندسی سازه های آبیاری و زهکشی | ||
| مقاله 7، دوره 17، شماره 66، خرداد 1395، صفحه 71-86 اصل مقاله (2.4 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/aridse.2016.106414 | ||
| نویسندگان | ||
| محمدرضا مددی؛ مجید رحیم پور* ؛ کورش قادری | ||
| دانشگاه شهید باهنر کرمان | ||
| چکیده | ||
| رسوب گذاری مخازن سدها همواره به عنوان یکی از چالش های اساسی در استفادۀ پایدار از این سازه ها و عامل اصلی از دست رفتن حجم ذخیرۀ آنها مطرح بوده است. یکی از رایج ترین تکنیکهای مهندسی برای حفظ ظرفیت ذخیرۀ مخازن، تخلیۀ دورهای رسوب با رسوب شویی تحت فشار است. مرور منابع علمی مختلف نشان می دهد که در حال حاضر راندمان رسوب شویی تحت فشار بسیار پایین است. در این مقاله تأثیر استفاده از سازۀ نوع PBC بر راندمان تخلیۀ رسوب در حین رسوب شویی تحت فشار به صورت آزمایشگاهی بررسی شده است. در این راستا از سازۀ PBCبا چهار قطر و چهار طول نسبی مختلف در مخزن سد استفاده شد. مصالح ماسه ای غیرچسبنده با اندازۀ متوسط 0/36 میلی متر به عنوان رسوب بستر مخزن در نظر گرفته شد. نتایج بررسی ها نشان میدهد که با کاربرد سازۀ PBC با مشخصۀ LPBC/Doutlet=5/26 و DPBC/Doutlet=1/32، راندمان رسوب شویی در مقایسه با شاهد 4/57 برابر شده است. با افزایش طول نسبی سازه، طول و عرض ماکزیمم نسبی مخروط رسوب شویی نسبت به شاهد افزایش یافت ولی تغییرات عمق ماکزیمم نسبی ناچیز بود. همچنین، کلیۀ پارامترهای هندسی مخروط رسوبشویی در قطر بی بعد DPBC/Doutlet= 1/32 حداکثر مقدار خود را داشتند. | ||
| کلیدواژه‌ها | ||
| راندمان رسوب شویی؛ رسوب شویی مخازن؛ سازۀ PBC؛ مخروط آبشستگی | ||
| عنوان مقاله [English] | ||
| Improving the Reservoir’s Pressurized Flushing Efficiency by Connecting PBC Structure to the Dam Bottom Outlet | ||
| نویسندگان [English] | ||
| Mohamad Reza Madadi؛ Majid Rahimpour؛ Kourosh Qaderi | ||
| Shahid Bahonar University of Kerman | ||
| چکیده [English] | ||
| Reservoir sedimentation is always known as a serious problem for sustainable use of reservoirs and the main factor of reservoirs storage loss. One of the most common engineering techniques for preserving the reservoirs storage capacity is the periodical desilting of reservoirs by hydraulic flushing. Review of the literature shows that the pressurized flushing operation is currently accomplished with low efficiency. In this paper, the effect of PBC structure on the sediment removal efficiency during pressurized flushing operation was experimentally investigated. In this way, PBC structure with four relative length and four relative diameters were used in the reservoir. Non-cohesive sand particles with D50=0.36 mm were used as the deposited sediments in the reservoir. The results showed that by using the PBC structure with LPBC/Doutlet = 5.26andDPBC/Doutlet = 1.32, the flushing efficiency became 4.57 times more than that of reference test. By increasing the relative length of PBC structure, the maximum relative length and width of flushing cone increased, respectively, compared to the reference test while the variation of the maximum relative depth was negligible. In addition, all the geometric parameters of flushing cone hadtheir maximum values atDPBC/Doutlet = 1.32. | ||
| کلیدواژه‌ها [English] | ||
| Flushing Cone, Flushing Efficiency, PBC Structure, Reservoir Desilting | ||
| مراجع | ||
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