Introduction to Turbomachines. Dimensional Analyses and Performance Laws.

Axial Flow Compressors and Fans: Introduction – aero-thermodynamics of flow through an axial flow compressor stage – losses in axial flow compressor stage – losses and blade performance estimation, radial equilibrium equation – design of compressor blades – 2-D blade section design, axial compressor characteristics – multi-staging of compressor characteristics – high Mach number compressor stages – stall and surge phenomenon – low speed ducted fans.

Axial Flow Turbines: Introduction – turbine stage – turbine blade 2-D (cascade) analysis work done – degree of reaction – losses and efficiency – flow passage – subsonic, transonic and supersonic turbines – multi-staging of turbine – exit flow conditions – turbine cooling – turbine blade design – turbine profiles, airfoil data and profile construction.

Centrifugal Compressors: Introduction – elements of centrifugal compressor/fan – inlet duct impeller – slip factor – concept of rothalpy – modified work done – incidence and lag angles – diffuser – centrifugal compressor characteristics – surging, chocking, rotating stall.

Radial Turbine: Introduction – thermodynamics and aerodynamics of radial turbines – radial turbine characteristics – losses and efficiency.

Same as Reference

1. Cumpsty, N. A., Compressor Aerodynamics, 2nd ed., Krieger Pub. Co. (2004).

2. Johnsen, I. A. and Bullock, R. O. (Eds.), Aerodynamic Design of Axial-Flow Compressors, NASA SP-36 (1965).

3. El-Wakil, M. M., Powerplant Technology, McGraw Hill (1985).

4. Glassman, A. J. (Ed.), Turbine Design and Application, NASA SP-290 (1972).

5. Lakshminarayana, B., Fluid Dynamics and Heat Transfer of Turbomachinery, Wiley (1995).

6. El-Sayed, A. F., Aircraft Propulsion and Gas Turbine Engines, CRC Press (2008).

7. Dixon, S. L. and Hall C. A., Fluid Mechanics and Thermodynamics of Turbomachinery, 7th ed., Butterworth-Heinemann (2014).

Course Outcomes (COs):

CO1: To be thorough with thermodynamic performance of diffusers, compressors, turbines, noz- zles along with Euler turbine equation.

CO2: To study the performance of axial compressors with velocity triangle and dimensional anal- ysis.

CO3: To design and analyse axial compressors based on Degree of reaction, Stability margin, Cascade analysis, and by following different vortex theories.

CO4: To know the importance of radial compressors.

CO5: To construct velocity triangles of radial compressor at different reactions.

CO6: To understand the performance of radial compressor based on non-dimensional analysis and stability.

CO7: To be familiar with velocity triangles of axial/ radial turbines as well as their difference from the compressors.

CO8: To know the different types of turbines based on reaction and their design.