Introduction to Turbine Aerothermodynamics — Lesson 1

This lesson covers the fundamental concepts of axial flow turbines, a crucial component in gas turbine engines. It delves into the role of axial flow turbines in supplying power to the axial flow compressor, the flow dynamics within the turbine, and the conversion of potential energy to kinetic energy. The lesson also explains the difference between impulse and reaction turbines, and how these turbines extract energy from high-energy gas to produce mechanical work. It further discusses the efficiency of turbines and introduces the Euler's equation for work done by the turbine.

Video Highlights

01:19 - Explanation of the flow in axial flow turbines and how it differs from axial flow compressors.
05:55 - Explanation of how turbines extract work from high energy fluid and transmit mechanical energy to other components.
31:13 - Overview of the different types of turbines: impulse and reaction turbines and turbine efficiency.
43:25 - Introduction to the theory of axial flow turbines.

Key Takeaways

- Axial flow turbines are the heart of gas turbine engines, supplying power to the axial flow compressor.
- The flow within the turbine is not strictly axial but zig-zags through the blades due to their cambered or curved nature.
- Turbines convert high potential energy into kinetic energy, which is then used to produce mechanical work.
- There are two types of turbines: impulse and reaction. Impulse turbines work solely on the impingement of the jet, while reaction turbines also utilize a reaction force for energy extraction.
- The efficiency of a turbine can be measured in terms of the real work done compared to the ideal work that could have been done.