بررسی عددی تاثیر محرک پلاسما بر کارآیی خنک‌کاری لایه‌ای سوراخ تزریق لایه‌گستر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، دانشکده فنی، دانشگاه گیلان، رشت، ایران

2 گروه مهندسی مکانیک، دانشکده فنی و مهندسی شرق گیلان، دانشگاه گیلان، رودسر، ایران

چکیده

در مطالعه حاضر، تاثیر محرک پلاسما بر میدان‌های جریان و دما در روش خنک کاری لایهای بر روی یک صفحه تخت از طریق سوراخ تزریق لایه گستر به صورت عددی مورد بررسی قرار گرفته است. جریان سه بعدی، آشفته، غیرقابل تراکم و پایدار درنظر گرفته شده و شبیه سازی‌های عددی با استفاده از شبکه سازمان یافته و غیریکنواخت، با بکارگیری مدل آشفتگی ِکی - اِپسیلون رینولدز پایین انجام شده است. به منظور اعتبارسنجی، نتایج عددی حاضر با نتایج تجربی و عددی مقایسه شده که از تطابق مناسبی برخوردار می‌باشد. سپس تاثیر پارامترهای مختلف جریانی و الکتریکی در حضور پلاسما بررسی شده است. در ادامه، با زاویه تزریق، نسبت طول به قطر سوراخ تزریق و نسبت چگالی ثابت، بررسی در مقادیر مختلف نسبت دمش 0/5 ،0/25 و ،1ولتاژهای ورودی 16 ،0و 24 کیلوولت و سرعت‌های مختلف ورودی 9 ،4/5و 45متر برثانیه انجام شده است. مطابق نتایج، سوراخ تزریق لایه گستر نسبت به استوانه‌ای به دلیل گسترش جانبی اثرات بهتری بر خنک کاری لایه‌ای می‌گذارد. تاثیر محرک پلاسما بر کارآیی خنک کاری لایه‌ای در نسبت دمش و سرعت‌های پایین، بیشتر و با افزایش ولتاژ اعمالی نیز زیاد می‌شود. بنابراین حالت بهینه جهت ارتقای راندمان خنک کاری، در شرایط ولتاژهای بالاتر و نسبت دمش و سرعت‌های پایین‌تر می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical Investigation of the Effect of Plasma Actuator on the Film Cooling Effectiveness By Fan-Shaped Hole

نویسندگان [English]

  • S. Dolati 1
  • N. Amanifard 1
  • H. Mohaddes Deylami 2
1 Faculty of Mechanical Engineering, Guilan University, Guilan, Iran
2 Faculty of Technology and Engineering, East of Guilan, Guilan University, Guilan, Iran
چکیده [English]

In the present study, the effects of plasma actuator on the flow and thermal fields of the film cooling through a single row of inclined fan-shaped hole over a flat plate model have been investigated. Numerical simulations have been conducted for analyzing incompressible, turbulent and steady fluid flow. Simulations were implemented using non uniform structured grid and Low- Re k-ε turbulence model. The present computed results have been compared with the numerical and experimental results and it can be seen that the gained film cooling effectiveness distributions on the flat plate agree very well with them. Then, at constant degree injection angle, length-to-diameter ratio and density ratio, investigation has been implemented, with different blowing ratios of 0.25, 0.5 and 1, applied voltages of 0, 16 and 24kV and different velocities of 4.5, 9 and 45m/s. Based on the results, fan-shaped injection hole creates better film cooling performance. And also, the effect of plasma actuator on film cooling effectiveness is better at lower blowing ratios and this improvement becomes more obvious at higher applied voltages. Also, its performance is better in low velocities. Finally, the best situation for improvement of effectiveness is in higher voltages, lower blowing ratios and low velocities.

کلیدواژه‌ها [English]

  • Film cooling
  • Plasma actuator
  • Fan-shaped hole
  • Numerical investigation

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 50، شماره 6
بهمن و اسفند 1397
صفحه 1213-1228

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