Instability in Axial Compressors Contd — Lesson 3

This lesson covers the concept of turbomachinery aerodynamics, focusing on the operation of compressors under extreme off-design conditions and the instabilities that can occur. It delves into the two primary modes of instabilities: rotating stall and surge. The lesson also discusses the factors that influence these instabilities, including compressor geometry, design, and performance characteristics. It further explores the impact of inlet distortion on compressor stability and the various control mechanisms that can be implemented to manage these instabilities. The lesson also touches on the significance of engine performance and the role of the compressor in ensuring stable engine performance.

Video Highlights

02:16 - Introduction to the topic of inflow quality and inlet distortion and its effect on compressor stability.
04:55 - Explanation of the effect of intake performance on the operation of the compressor.
15:16 - Discussion on the impact of inlet distortion on engine performance.
30:22 - Explanation of the concept of distortion coefficient to quantify distortion.
47:41 - Explanation of different methods to control instabilities, including passive and active control techniques.

Key Takeaways

- Compressors can operate under extreme off-design conditions, leading to instabilities such as rotating stall and surge.
- The occurrence of these instabilities depends on various parameters, including the geometry, design, and performance characteristics of the compressor.
- Inlet distortion can significantly impact compressor stability.
- Control mechanisms for managing these instabilities are still in the development stage and have not been widely implemented in actual engines due to practical limitations.
- The performance of the engine as a whole is somewhat limited by the compressor performance, making the compressor a key component in ensuring stable engine performance.