مشخصات پژوهش

خانه /Computational fluid dynamics ...
عنوان
Computational fluid dynamics simulation of aerodynamic performance and flow separation by single element and slatted airfoils under rainfall conditions
نوع پژوهش مقاله چاپ‌شده
کلیدواژه‌ها
Aerodynamic performance, Airfoil, Flow separation, Leading-edge slat, Rainy conditions
چکیده
This study investigated the effects of rainfall on flow separation and the aerodynamic performance of single elementandslattedNACA0012airfoilsbyusingamathematicalmodel developedwiththe commercialcomputationalfluiddynamicssolverANSYSFLUENT18.2. Atwo-way momentumcoupled Eulerian–Lagrangianmultiphaseapproach wasusedto simulate the formation ofthe waterfilmlayer onthe airfoil’ssurface. Accordingto the results, verylow valuesofthe lift-to-drag ratio atlow anglesofattackreflected severe degradationofthe aerodynamicperformanceofthe airfoilin the presenceofwateraccu-mulatedonits surface. Theimpact ofrain dropletsonthe leading-edge slat surface led to less wateraccumulatingonthe mainsectionofthe airfoil.In particular,the maximum waterfilmmassconcentratedonthe airfoilsurfacedecreasedfrom 15gto 1gcompared withthe singleelementairfoil.Hence,the thickness ofthe waterfilmlayer wasnotsuf-ficientlylarge to significantlyaffectthe aerodynamiccoefficientsofthe slattedairfoil,es-peciallythe maximumlift coefficient,comparedwiththe thicker waterfilmlayer onthe singleelementairfoil.In addition,the useofslatsclearlyenhancedthe aerodynamicco-efficientsandincreased the stallanglefrom 13°to 22°in dryconditions,andfrom 16°to 24°in rainyconditions.Slatsalsosignificantlydecreasedtheboundarylayer thicknessand delayedthe separationathigheranglesofattack.
پژوهشگران حسین فتاحیان (نفر اول)، حسام الدین سالاریان (نفر دوم)، مجید اسحق نیموری (نفر سوم)، جهانفر خالقی نیا (نفر چهارم)