Eliminating Boundary Layer Separation on a Cylinder with Nonuniform Suction
المؤلفون المشاركون
Ramsay, James
Ho, Wei Hua
Sellier, Mathieu
المصدر
International Journal of Aerospace Engineering
العدد
المجلد 2020، العدد 2020 (31 ديسمبر/كانون الأول 2020)، ص ص. 1-11، 11ص.
الناشر
Hindawi Publishing Corporation
تاريخ النشر
2020-07-22
دولة النشر
مصر
عدد الصفحات
11
الملخص EN
Boundary layer separation negatively influences the performance of aerospace vehicles, for example, by triggering static stall or reducing combustion engine efficiency.
Developing effective flow control to delay or eliminate separation is therefore of real use to the field.
In this paper, numerical studies were carried out to optimise distributed suction profiles for preventing boundary layer separation on a circular cylinder in the fully laminar regime (Re<188), with the least control effort.
Relationships were found between the Reynolds number, the separation angle of the uncontrolled case, and the uniform suction needed to eliminate separation.
It was found that for Re>20, the uniform suction required to eliminate separation followed a quadratic profile, as a function of Re.
Maximum uniform suction effort was needed at Re=20, requiring a suction coefficient of CQ=49.14 (as a percentage of the free-stream velocity) to eliminate separation.
To resolve the best nonuniform suction profile at Re=180, a variety of optimisation studies were performed using the coordinate search method.
It was determined that the use of six control segments on each half of the cylinder provided the best control and efficient convergence to the optimal solution.
6-segment nonuniform suction eliminated separation at Re=180 with net suction effort of CQ=13.26 compared to CQ=31.25 for the uniform case.
These optimal suction profiles were compared using time-dependent simulations to confirm that both methods eliminate separation when introduced to an already unsteady case.
Nonuniform suction eliminated separation faster, though uniform suction was more stable.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Ramsay, James& Sellier, Mathieu& Ho, Wei Hua. 2020. Eliminating Boundary Layer Separation on a Cylinder with Nonuniform Suction. International Journal of Aerospace Engineering،Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1168600
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Ramsay, James…[et al.]. Eliminating Boundary Layer Separation on a Cylinder with Nonuniform Suction. International Journal of Aerospace Engineering No. 2020 (2020), pp.1-11.
https://search.emarefa.net/detail/BIM-1168600
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Ramsay, James& Sellier, Mathieu& Ho, Wei Hua. Eliminating Boundary Layer Separation on a Cylinder with Nonuniform Suction. International Journal of Aerospace Engineering. 2020. Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1168600
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references
رقم السجل
BIM-1168600
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
تقوم هذه الخدمة بالتحقق من التشابه أو الانتحال في الأبحاث والمقالات العلمية والأطروحات الجامعية والكتب والأبحاث باللغة العربية، وتحديد درجة التشابه أو أصالة الأعمال البحثية وحماية ملكيتها الفكرية. تعرف اكثر