مطالعه تجربی ساخت سطوح دندانه‌دار کاهنده نیروی پسا با استفاده از روش پردازش نور دیجیتال (DLP)

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه صنعتی مالک اشتر

چکیده

طبیعت زنده یک منبع اصلی برای ارائه طرح‌های خلاقانه جهت حل مشکلات فنی است. پوست بدن کوسه‌های سریع به دلیل وجود ساختارهای دندانه‌ای با نیروی پسای پایین، منبعی برای الهام از طبیعت برای بسیاری از کاربردهای مهندسی است. هدف اصلی در این پژوهش بررسی توانایی روش‌های ساخت افزایشی و بکارگیری تکنیک پرینت سه‌بعدی در ساخت سطوح دندانه‌دار کاهنده نیروی پسا است. در این مطالعه سطوح دندانه‌دار الگو گرفته شده از پوست کوسه‌های سریع طراحی شده و با استفاده از روش پرینت سه‌بعدی پردازش نور دیجیتال (DLP) در ابعاد میکرون از رزین زرد رنگ ساخته شده است. سپس یک کانال بسته از جنس پلکسی گلاس که سطح پایینی آن شامل سطح دندانه‌داراست، جهت ارزیابی قابلیت این سطوح در کاهش افت فشار طراحی و ساخته شده است. یک سامانه مهندسی شامل، پمپ، روتامتر، مخزن آب، اتصالات، مبدل فشاری، منبع تغذیه و نمایشگر برای اندازه‌گیری میزان افت فشار درون کانال از سطوح مختلف ساخته شده است. تست‌ها برای رینولدزهای مختلف برای سطوح دندانه‌دار گوناگون ساخته شده انجام و نتایج مربوط به مقادیر افت فشار با داده‌های تجربی نمونه شاهد مقایسه شده است. نتایج بیانگر توانمندی سطوح دندانه‌دار ساخته شده در کاهش افت فشار درون کانال است.

کلیدواژه‌ها

عنوان مقاله [English]

Experimental Study on the Fabrication of Drag Reducing Riblet Surfaces by Using DLP Technique

نویسندگان [English]

  • Mostafa Monfared Mosghani
  • Mohammad Ali Alidoostan
  • Alireza Binesh
Assistant professor/ Malek Ashtar university of technology
چکیده [English]

Nature and living organisms provide an abundance of creative designs that can be used to solve many technical and engineering problems. Fast swimming shark skin is covered with low drag microstructures which is a good source of inspiration from nature for numerous engineering applications. The main objective of this research is to explore the abilities of additive manufacturing methods and to use 3D printing technology to fabricate drag-reducing riblet surfaces. Thus, the shark skin imitated riblet surfaces have been designed and fabricated in micron scale by using a yellow resin specially-formulated for 3D printers and the DLP technique. Then, a closed channel made of Plexiglas with its bottom surface covered with a riblet surface has been designed and constructed to evaluate the ability of these surfaces in reducing the pressure drop. An engineering system including a pump, rotameter, water tank, connecting tubes, differential pressure transmitter, power supply and monitor has been installed to measure the amount of pressure drop across the channel for various riblet surfaces. The tests have been performed for different Reynolds numbers and various riblet surfaces, and the pressure drop results have been compared with empirical data for a channel with simple sample. The findings indicate the ability of riblet surfaces in reducing the pressure drop across the channel.

کلیدواژه‌ها [English]

  • Drag. Pressure Drop
  • Riblet Surface
  • Additive Manufacturing
  • DLP Technique
  • Closed Channel

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