Effect of Moving Surface on Aerodynamic Characteristics in NACA0012 Airfoil

Abstract

This study focuses on the elfects of moving surface on aerodynamics cltaracteristics in I{ACA 0012 airfbil through numerical simulation. Ty,o particular cases are considered: (i) Single moving iur/ace (ii) Doubte moving surJace. Wen 'single moving surfoce' is considered, onll one nnving surface of l0% of the chortl length(c) is placed at upper surface of the airfoil starting/rim 0.05c to 0.15c. Wen 'double moving surface' is considered, one moving surfoce of 1 0% of the chorcl length is placed at upper surface at position starting from 0.05c to 0 l 5c antl the other moving surface of sarne size is placed at lower surface at same positiott. Momentum injection into the flow .field moves the point of boundary layer separation in the vicinie of trailing edge o.f the airfoil. By momentum injection through single moving sudace with the surface velocity tw,ice the .free stream velocity and.for dffirent angle of attack, it is possible to reduce the average drag coefficient by 23.9%, compared with no moving surface. -For the same condition with double moving surface, it is possible to reduce the average dt'ag coeficient by 25.9%. For using moving surface, boundary-layer separation is delayed along thi chord length on the upper sudace of the airfoil. The value of lift coelficient increases slightly for moving surface. For single and double moving surface, averdge increment of lift to drag ratio qre 37.3% and 410% respectively.