Understanding Transonic Compressors — Lesson 4

This lesson covers the concept of Axial Flow Compressors, focusing on their evolution and functionality. It delves into the transition from subsonic to supersonic compressors, explaining the need for this shift due to the demand for increased compressor pressure ratio and performance. The lesson also discusses the challenges faced during this transition, such as the creation of shocks that result in energy loss. It further explores the development of transonic compressors, which are partly supersonic and partly subsonic, and their use in different applications like aircraft engines and rocket motors. The lesson concludes with a detailed explanation of the design and characteristics of different types of airfoils used in transonic compressors.

Video Highlights

01:25 - The challenges of supersonic flow through compressor blades, including shock losses.
07:13 - The transition of flow from subsonic to supersonic within the compressors .
15:34 - The creation of new airfoils to handle supersonic entry flow in a controlled manner.
27:56 - The development of different types of airfoils for transonic compressors, including double circular arc airfoils and controlled diffusion airfoils.
49:51 - The common features of shock structures in transonic compressors and their impact on performance.

Key Takeaways

- Axial Flow Compressors have evolved from being subsonic to supersonic to accommodate increased pressure ratio and performance.
- The transition to supersonic compressors led to the creation of shocks, resulting in energy loss.
- Transonic compressors, which are partly supersonic and partly subsonic, were developed to balance efficiency and performance.
- Different types of airfoils, such as double circular arc airfoils and multiple circular arc airfoils, are used in transonic compressors.
- The design and characteristics of these airfoils play a crucial role in the efficiency and performance of the compressors.