بررسی عددی تأثیر چرخش بر اثربخشی خنک‌کاری لایه‌ای پره توربین با جریان هوای خنک‌کننده نوسانی موج مربعی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه سمنان

چکیده

در این مقاله اثر چرخش پره توربین بر توزیع دما و اثربخشی خنک­کاری لایه­ای برای جریان سیال خنک­کننده نوسانی موج مربعی به‌صورت عددی بررسی شده است. جریان هوای نوسانی مربعی در سه فرکانس 2، 50 و Hz500 جهت خنک­کاری به سطح پره توربین تزریق می­شود. چهار سرعت چرخش 0، 500، 800 و rpm 1000 در دو جهت مثبت و منفی جهت ایجاد سطوح فشار و مکش در نظر گرفته شده است. مدل­سازی هندسه در نرم­افزار گمبیت و تحلیل عددی توسط نرم­افزار فلوئنت انجام شده است. جهت در نظر گرفتن اثرات آشفتگی از مدل توربولانسی  استفاده شده است. چرخش باعث انحراف جریان خنک­کننده از خط مرکزی می‌شود. با نوسانی کردن جریان خنک‌کننده به فرم مربعی، میزان اثربخشی خط مرکزی در هر گام زمانی یک سیکل تغییر می­کند. نتایج نشان داد به‌طور کلی مقادیر اثربخشی در تمامی سرعت­های چرخش در سمت فشار پره بیشتر از سمت مکش است و با افزایش فرکانس­ میزان اثربخشی متوسط خط مرکزی افزایش ­می­یابد.

کلیدواژه‌ها

عنوان مقاله [English]

Numerical Study of the Effect of Rotation on the Film Cooling Effectiveness of a Turbine Blade with Square Pulsating Cooling Flow

نویسندگان [English]

  • mahdi hoseini baghdad abadi
  • saAdat zirak
  • mehran rajabi zargar abadi
semnan
چکیده [English]

In this paper, the effect of the turbine blade rotation on the temperature distribution and film cooling effectiveness for a square pulsing cooling flow is numerically studied. The square pulsed cooling air flow is injected to the turbine blade at three frequencies of 2, 50, and 500 Hz. Four rotation speeds of 0, 500, 800, and 1000 rpm, clockwise and counter-clockwise, are considered. Geometry is modeled in Gambit and the numerical analysis is performed by Fluent software. SST k-ω turbulence model is used to apply the turbulence effects. The obtained results show that the rotation deviates the coolant flow from the centerline. Changing the coolant flow to square pulsating, centerline effectiveness changes with time in a cycle. The results show that in general, the effectiveness ​​at all speeds on the pressure side are greater than the suction side. Moreover, with increasing frequency, the average level of centerline effectiveness increases.
 

کلیدواژه‌ها [English]

  • Pulse Film Cooling
  • Square Wave
  • Rotating
  • Turbine Blade
  • SST k-ω Turbulence Model

مراجع

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فایل ها

سابقه مقاله

  • تاریخ دریافت: 20 آبان 1397
  • تاریخ پذیرش: 24 فروردین 1398
  • تاریخ انتشار: 01 تیر 1398

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