نوع مقاله : مقالة‌ تحلیلی‌

نویسندگان

1 دانشجوی دکتری، پژوهشگاه هوافضا، وزارت علوم، تحقیقات و فناوری، تهران، ایران

2 دانشیار، پژوهشکده مکانیک و فناوری های ساخت، دانشگاه صنعتی مالک اشتر، تهران، ایران

3 استاد، دانشکده مهندسی هوافضا، دانشگاه صنعتی شریف، تهران، ایران

چکیده

در طراحی کپسول‌های بازگشتی به دلیل عدم وجود سطوح کنترلی قابل توجه، همواره به مقوله پایداری استاتیکی و دینامیکی توجه شایانی می‌شود. در این مقاله سعی شده است تا نتایج تجربی کسب شده برای تعیین این ضرایب‌ به کمک روش نوسان اجباری پیچش در سرعت مافوق‌صوت مورد بررسی قرار گیرد. در این بررسی تجربی اهمیت پارامترهای عدد ماخ جریان آزاد، زاویه حمله میانگین و فرکانس نوسان پیچش در ضرایب پایداری دینامیکی مورد ارزیابی قرار گرفته است. براساس نتایج در عدد ماخ 8/1 احتمالاً کپسول‌ بازگشتی از لحاظ دینامیکی شروع به ناپایداری می‌کند. یکی از روش‌ها برای عبور از این مشکل دادن زاویه حمله میانگین به کپسول است. این تغییر زاویه حمله میانگین، مشابه نتایج ارائه شده برای زاویه میانگین پنج درجه، منجر به پایداری دینامیکی خواهد شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental Study of Dynamic Stability for a Entry Capsule in Supersonic Flow

نویسندگان [English]

  • Mohsen Sargolzaie 1
  • Hamid Fazeli 2
  • Mohammadreza Soltani 3

1 Ph.D. Student, Aerospace research institute. Ministry of Science, Research and Technology. Tehran. Iran

2 Associate Professor‎, Research Institute of Mechanics and Manufacturing Technologies, Malik Ashtar University of Technology. Tehran, Iran

3 Professor‎, Department of Aerospace Engineering. Sharif University of Technology, Tehran, Iran

چکیده [English]

Due to the lack of existence of control surfaces in entry capsules, the subject of static and dynamic stability is always important. In this paper, these coefficients are investigated experimentally for the case of forced oscillation at supersonic flow. In this experimental study, the effects of freestream Mach number, mean attack angle and pitch frequency on dynamic stability coefficients were evaluated. According to the results, in Mach 1.8, the geometry starts to be dynamically unstable. One approach to overcome this problem is to change the average attack of angle of the model. This change in the mean attack of angle, similar to the results presented for the five-degree mean angle, will lead to dynamic stability.

کلیدواژه‌ها [English]

  • Entry capsule
  • Supersonic flow
  • Dynamic stability
  • Experimental aerodynamic
  • Unsteady aerodynamic
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