2nd Cycle of Studies

(205) Aerodynamics

1. Characteristic parameters of airfoil aerodynamics. Airfoil and wing geometry parameters. Aerodynamic forces and moments. 2. 2-D incompressible flow on airfoils. Circulation and lift generation. Thin airfoil theory and analytical solutions. High lift airfoils. High lift devices (flaps and slats). 3. Incompressible flow on finite-span wings. Velocity and pressure distribution on wings. Circulation profile on an elliptic planform. Wing-tip vortex and induced drag. Evaluation of aircraft flight forces. Winglets and other devices for reducing the induced drag. Delta wings. Asymmetric loading on rotationally symmetric bodies. 4. Compressible flow. Thermodynamic equations applied to compressible flow. Speed of sound. Mach cones, shock waves on airfoils. Normal and oblique shock waves. Compression and expansion waves. 5. Compressible subsonic and transonic flow around airfoils and wings. Equations for compressible flow around airfoils. Trans-sonic and supersonic airfoils. Drag coefficient due to compressibility in trans-sonic flows. Supercritical airfoils. Swept wings. Supersonic wings. Wing-fuselage interaction and area rule.

(207) Turbomachines

Introduction to turbomachinery, general principles, typical configurations. Turbomachines and their operation. Typical characteristic maps of turbomachines, similarity laws, cooperation of turbomachines. Fluid mechanics and thermodynamics of turbomachines, thermodynamic cycles of gas and steam turbines. Relative flow, velocity triangles, Euler’s law. Aerodynamics of turbomachinery, basic principles of operation, efficiencies, reaction, non dimensional numbers. Axial compressors: design, operation, instability. Blade aerodynamics for axial compressors operating both in sub- and super-sonic regions. Flow phenomena, 3D effects, tip leakage flows. Multistage systems. Radial turbomachinery: Description, velocity triangles, design and operation problems. Axial turbines: Blade design and construction characteristics, 3-D flows. Blade cooling methodology and construction problems. Pumps: Study of the phase change of water under extremely low pressures, cavitation. Operational characteristics, analysis of 3-D flow effects, multistage pumps, technical and operational problems. Radial turbines. Theory of design and operation, study of the flow in radial turbine rotors. Water turbines: Fluid mechanics of Pelton, Francis and Caplan turbines. Design and construction, operational characteristics, cavitation.