بررسی تجربی اثر آیرواسپایک بر کاهش پسای سه نوع دماغه پخ در عدد ماخ 6.4

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه افسری و تربیت پاسداری امام حسین علیه السلام

2 دانشکده فنی و مهندسی - گروه هوافضا

3 دانشکده فنی و مهندسی

چکیده

چالش اصلی پیش روی طراحان اجسام پرنده ماوراء صوت، میزان قابل‌توجه پسای فشاری و گرمایش آئرودینامیکی است. اگرچه دماغه­های پخ برای توزیع بهتر گرما ترجیح داده می­شوند لیکن نیروی پسای زیادی تولید می­کنند. اسپایک­ها و آیرودیسک­ها ابزار کارآمدی برای کاهش پسا و گرمایش هستند. در این تحقیق اثرات هندسه آیرواسپایک در کاهش پسای سه نوع دماغه پخ نیم کروی، تریدنت و HB1، در یک تونل باد ماوراء صوت ارزیابی‌شده است. آزمایش‌ها بر روی دماغه­های پخ در شرایط با و بدون آیرواسپایک در عدد ماخ 6.4  با اندازه­گیری نیروی پسا و مشاهده امواج ضربه­ای با استفاده از روش شیلیرین انجام‌شده است. برای این مطالعه دو آیرواسپایک نیم کروی با نسبت طول به قطر 1 و 2 در نظر گرفته شد. نتایج نشان می­دهند که در هر سه دماغه، آیرواسپایک با تبدیل موج کمانی قوی به امواج ضعیف و به دنبال آن ناحیه چرخشی یا منطقه هوای مرده، موجب کاهش فشار در جلوی دماغه و اعمال پسای کمتر می­گردد. عامل اصلی کاهش پسا، دماغه آیرواسپایک بوده و نسبت بهینه طول به قطر اسپایک با هندسه دماغه پخ تغییر می­کند. بیشترین کاهش پسا به میزان 74.8 درصد برای آیرودیسک با نسبت طول به قطر 2 در دماغه پخ نیم کروی مشاهده گردید.

کلیدواژه‌ها

عنوان مقاله [English]

The Experimental Study of the Effect of Aerospike on Reducing the Drag of Three Types of Blunt Noses at Mach Number of 6.4

نویسندگان [English]

  • mahdi hasani 1
  • abdolali haghiri 2
  • mohammad hadi eslami 3
1 Imam Hossein University for Training officers & Guards
2 دانشگاه امام حسین (ع)
3 دانشگاه امام حسین (ع)
چکیده [English]

The main challenges facing the designers of hypersonic flying objects are the significant amount of pressure drag and aerodynamic heating. However, blunt noses are preferred for better heat distribution, but they produce a lot of drag force. Spikes and aero disks are effective tools for reducing drag and heating. In this study, the effects of aerospike geometry on the drag reduction of three types of hemispherical, Trident and HB1 noses, in a hypersonic wind tunnel have been evaluated. Experiments were performed on blunt noses in the two conditions of with and without aerospike at Mach number of 6.4 by measuring the drag force and observing the shock waves using the Schlieren technique. For this study, two hemispherical aerospikes with length to diameter ratios of 1 and 2 were considered. The results show that in all three noses, the aerospike converts a strong bow shock into a weak shock, and followed by a rotational zone or dead air zone, reduces the pressure in front of the nose and hence, leads to less drag exertion. The main cause of drag reduction is the aerospike nose and the optimal spike length to diameter ratio is with the blunt nose geometry. The highest drag reduction of 74.8% is observed for an aero disk with the length to diameter ratio of 2 in the hemispherical blunt nose.

کلیدواژه‌ها [English]

  • Hypersonic Wind Tunnel
  • Blunt Noses
  • Aerospike
  • Drag Reduction

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سابقه مقاله

  • تاریخ دریافت: 30 فروردین 1400
  • تاریخ بازنگری: 17 تیر 1400
  • تاریخ پذیرش: 08 شهریور 1400
  • تاریخ انتشار: 01 خرداد 1400

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