Study of the aerodynamics of translating spinning discs in laminar and turbulent flow

الموضوعات

علوم بحتة وطبيعية

الملخص

The objective of the work is to study the aerodynamic characteristics ofspinning translating axi-symmetric discs in steady laminar and turbulent flows.Applications of this nature are fundamental in unmanned air vehicles (UAVs) andsport. The effect of varying Reynolds number and the spin ratio was reported.Also, the study included analytical and computational studies of the flow aroundtranslating spinning discs.Further, a coin-shaped disc with a thickness to diameter ratio 0.1 in laminarand turbulent flows was simulated using ANSYS CFX 12.1. The momentcoefficients were compared to experimental data in literature. The results wereclose to the experimental results in the range of Reynolds number examined.Laminar and turbulent flows around an oblate spheroid disc were simulated.The problem was tackled through the use of ANSYS CFX 12.1. First a laminarflow with Reynolds number 1.59E4 was simulated and aerodynamic loads andmoments were calculated. Then turbulent flows with Reynolds number rangingfrom 5.13E6 to 1.03E7 were simulated. The angle of attack was varied in the range0° to 30° and the spin ratio was varied in the range 0 to1.The results obtained show that the aerodynamic loads and momentcoefficients are dependent on Reynolds number for the range of the Reynoldsnumbers simulated. It was observed that around Reynolds number 9.24E6 therewas remarkable surge on the maximum lift to drag ratio. Otherwise, the effect ofReynolds number on this ratio was slight.For Reynolds number 9.24E6 the effect of spin ratio on the rolling momentcoefficient was found to be slight. The remaining loads and moment coefficientswere found to be not affected by the spin ratio.Pressure contour plots were presented for both upper and lower surface forthe angles of attack mentioned.

روابط وملفات

التعريف والنوع

رقم الوثيقة

044b50c2-4db2-47b1-a4bc-47f88b2cf92a

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

1637930_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"علي محمد","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"محسن حسن","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"محمد هاشم","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"هناء خالد","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

Study of the aerodynamics of translating spinning discs in laminar and turbulent flow

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

علي محمد, محسن حسن, محمد هاشم

الإعداد

هناء خالد

الاقتباسات الببليوغرافية