www.tjprc.org SCOPUS Indexed Journal editor@tjprc.org NUMERICAL & AERODYNAMIC ANALYSIS OF CLARK Y AIRFOIL IN AN OPEN WIND TUNNEL K. HARISH KUMAR, A. SHANTHI SWAROOPINI, SAVITRI VEMIREDDI & P. HARISHA Department of Mechanical Engineering, Vignan’s Institute of Information Technology (A), Vizag, India ABSTRACT In the current world almost all the aerodynamic bodies are designed and then analysed for preliminary results. These designs however need to be verified and tested in real time. To study various flow parameters and response of any aerodynamic body under varying conditions and orientations, wind tunnels are used. These tunnels are usually of open or closed types which can be used to conduct studies over flows past any aerodynamic body or structure. The work focuses on aerodynamics design of a Wind Tunnel to simulate and disseminate results of subsonic flows, measurement of lift coefficient (CL) and drag coefficients (CD) which can be used to determine performance of any aerodynamic body. The proposed tunnel was designed based on flow theories to obtain a preliminary design of subsonic tunnel. An open type wind tunnel is designed using CAD tool which is further simulated using ANSYS CFX. The CFD results are examined to decide an optimized design which is then fabricated to carryout experimentation. The model comprises of three parts namely contraction cone which is a convergent tract, test section and a diffuser commonly referred to as diverging tract. The wind speed of the tunnel is varied with the use of a variable transformer. The tunnel manufactured is used to study lift and drag forces acting on different aerodynamic structures and designs. The aerodynamic study of CLARK Y air foilis carried out for testing in wind tunnel after a standard calibration. KEYWORDS: Open Wind Tunnel, Aerodynamics, Subsonic Flow, CFD Analysis Received: Jun 06, 2020; Accepted: Jun 26, 2020; Published: Aug 25, 2020; Paper Id.: IJMPERDJUN2020880 INTRODUCTION A Wind Tunnel is a tool that is used to study the effects of air and the quality of flow and its aerodynamic characteristics. The phenomenon of flow separation to aerofoil is associated with the break-off of the thin layer at the wing surface. How the separation of flow develops to the moment of the full separation, is dependent on various factors: an aerofoil thickness (thin, moderate, and thick), an airflow type (turbulent, laminar, and supercritical), the angle of attack, an aerofoil surface quality (smooth or with roughness), flow conditions (altitude and air turbulence), and Reynolds number [1]. Computational Fluid Dynamics (CFD) has now reached a high degree of confidence so that the researcher in aerodynamics considers that it is an excellent good means to understand the physical reality as well as the measurements acquired during flight tests or in Wind Tunnels. Moreover, taking advantage of the constantly improved reliability of digital means, the concept of computer-aided Wind Tunnels was born. This process aims to correct the results of tests by the results of numerical calculations in conjunction with the tests in the same Wind Tunnel environment. The characteristics of the test are taken into account to determine the effect of the walls, the effect of the support, and, more generally, of anything that could affect the experiment. Furthermore, the numerous Wind Tunnel construction projects in emerging countries show that the use of experiments in the aerodynamics domain is still relevant [2]. Apart from that, the simulation is carried out only to the Test section by considering the Full-scale model of the Wind Tunnel instead of the conventional approach which allows for the Original Article International Journal of Mechanical and Production Engineering Research and Development (IJMPERD) ISSN (P): 2249–6890; ISSN (E): 2249–8001 Vol. 10, Issue 3, Jun 2020, 9285–9296 © TJPRC Pvt. Ltd.