پديد آورنده :
نجفي، مسعود
عنوان :
مطالعه تاثير مكش و دمش بر كنترل جريان سيال بر انتقال حرارت از تك سيلندر مربعي تحت زاويه
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
تبديل اترژي
محل تحصيل :
اصفهان:دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
بيست، 105ص: مصور، جدول، نمودار
يادداشت :
ص.ع.به: فارسي و انگليسي
استاد راهنما :
احمد سوهانكار اصفهاني
توصيفگر ها :
كنترل فعال , ريزش گردابه
تاريخ نمايه سازي :
24/09/1392
استاد داور :
احمد رضا پيشه ور، احمد صداقت
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتال
چكيده انگليسي :
Study of the Effects of Suction and Blowing on the Control of Fluid Flow and Heat Transfer From a Square Cylinder at Incidence Masoud Najafi M najafi @yahoo com Department of Mechanical engineering Isfahan University of Technology Isfahan Iran Degree M Sc Language Farsi Supervisor Ahmad Sohankar asohankar@cc iut ac ir Abstract Flow over a bluff body usually creates a large region of separated flow and a massive unsteady wake region downstream and they have susceptibility to flow induced vibration Vortex shedding observed in the wake of these bodies generates unsteady periodic lift and drag forces Flow induced vibrations and generation of the fluctuating forces are major problems in most of flow systems in engineering and industrial applications If these phenomena are not considered in design of an engineering structure it can be demolished the structure due to oscillations formed in its natural frequencies Thus the elimination or reduction of the fluctuating forces and vortex shedding from such bodies by the application of the various passive or active flow control methods is necessary The aim of this study is to reduce the fluid forces acting on a bluff body by an active control The effects of uniform suction and blowing through the walls of a square cylinder at incidence between to degree on the vortex shedding wake flow and heat transfer are studied via a numerical investigation for laminar regime Re and turbulent regime Re Pr To solve the unsteady governing equations all simulations were performed with a finite volume code based on a collocated grid arrangement To find the optimum conditions where the suppression of the vortex shedding is occurred and the maximum reduction on the forces and their fluctuations is achieved some simple cases are examined In these cases the influence of the uniform blowing and suction only through one surface is studied for angles less than degree and two surfaces at degree Based on the obtained advantages of these simple cases different combinations of the suction and blowing on the cylinder sides are considered and an optimum case is introduced The results of this study for laminar case showed that the optimum case for cylinder at degree is achieved when the suction is applied on the front surfaces and the blowing is employed on the rear surfaces For angles between zero and degrees the optimum case is obtained when the suction is applied on the top surface and blowing is employed on the other faces In this study the effect of Reynolds numbers and angle of incidence on the results for the optimum configuration is also investigated for laminar flow In turbulent flow over cylinder at degree the results showed that the forces are sharply reduced when the active control is employed Keywords Active Control suction and blowing heat transfer square cylinder at incidence vortex shedding PDF created with pdfFactory trial version www pdffactory com
استاد راهنما :
احمد سوهانكار اصفهاني
استاد داور :
احمد رضا پيشه ور، احمد صداقت
