دانشگاه آزاد اسلامی

واحد تهران جنوب

دانشکده تحصیلات تکمیلی

سمیناربرای دریافت درجه کارشناسی ارشد

مهندسی عمران – سازه های هیدرولیکی

عنوان :

کاویتاسیون و راه های مقابله با آن در سازه های هیدرولیکی

برای رعایت حریم خصوصی اسامی استاد راهنما،استاد مشاور و نگارنده درج نمی گردد

تکه هایی از متن به عنوان نمونه :
(ممکن می باشد هنگام انتقال از فایل اصلی به داخل سایت بعضی متون به هم بریزد یا بعضی نمادها و اشکال درج نشود اما در فایل دانلودی همه چیز مرتب و کامل می باشد)
 
چکیده :
کاویتاسیون پدیده ای می باشد که در انواع سازه های آبی رخ میدهد و در کارایی
این سازه ها ایجاد می نماید .
این فرایند در نقاطی از سازه که سرعت بالا می باشد باعث ایجاد خرابی و
گودال می گردد در واقع جایی که در یک  سیستم هیدرولیکی به علت بالا
رفتن سرعت فشار منطقه ای پایین می آید و با فشار سیال برابر می گردد
یا جایی که ناصافی ها و ناهمواری های بستر جریان ، موجب جدا شدن
خطوط جریان از بستر می گردد و فشار منطقه ای کاهش می یابد این پدیده
نمود پیدا می کند و با ضربه زدن به مرز سیال و سازه ایجاد سرو صدا و در موردها
حادتر سبب خرابی می گردد . در واقع وجود میدان فشار در ناحیه ای که کاویتاسیون
رخ می دهد وجود ذرات و ناخالصی درون مایع و شکل جداره اصلی ترین عوامل دخیل
در رخ دادن پدیده کاویتاسیون می باشند . مورد هایی از ایجاد کاویتاسیون در سد های
بولدوزر در آریزونا ، پین فلات و کالیفرنیا ، فورت پک و دنیسون دراوکلاهما ، نورفورک
در آرکانزاس ، راندال و بول سولز در داکوتای جنوبی و در نهایت فالسوم در کالیفرنیا
درج و برررسی گردید .
تحقیقات نشان می دهد که هوادهی ، تجهیز سطوح در معرض تخریب و نیز بهره گیری
از روکش فولادی ، پرداخت سطحی سطوح در معرض تخریب کاویتاسیون و در نهایت
بهره گیری از رزین ها می توانند راهکار های مناسبی باشند و تا حد بسیار زیادی از تاخیر
مخرب این پدیده ها بکاهند .
در این پژوهش  با مطالعه موردی مطالعه کاویتاسیون در سرریز سد کارون تخریب های
صورت گرفته و علل آنها مطالعه گردیده و تبیین تعمیرات اولیه و نهایی آورده گردید .  
تعداد صفحه :85
قیمت : 14700 تومان

***

این مطلب رو هم توصیه می کنم بخونین:   دانلود پایان نامه ارشد : بررسی آزمایشگاهی رفتار خزشی خاک‌ها تحت تنش برشی ثابت
دسته‌ها: عمران

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