2D Losses in Axial Flow Compressors — Lesson 4

This lesson covers the fundamentals of axial flow compressors, focusing on the aerodynamics involved and the design aspects. It delves into the concept of cascades, simplified versions of axial flow compressor geometries, and their role in understanding the aerodynamics of flow in axial flow compressors. The lesson also discusses the significance of cascade analysis in the design of axial flow compressors. It further explains the performance parameters derived from a cascade analysis, including the total pressure loss and the static pressure coefficient. The lesson concludes with a detailed discussion on the various types of losses in a compressor, including profile loss, mixing loss, 3-D losses, and shock losses.

Video Highlights

03:56 - Explanation of the total pressure loss coefficient and the static pressure coefficient derived from a cascade analysis.
07:56 - Explanation of the concept of stalling in a cascade and its relation to the total pressure loss.
16:19 - Explanation of the different types of losses in a compressor, including viscous losses, 3-D losses, shock losses, and mixing losses.
22:25 - Discussion on the estimation of 2-D losses in a compressor, focusing on profile loss and mixing loss.
45:27 - Explanation of the shock losses in a transonic compressor and the effect of Mach number on the shock loss.

Key Takeaways

- Cascades are simplified versions of axial flow compressor geometries that provide insights into the aerodynamics of flow in axial flow compressors.
- Performance parameters derived from a cascade analysis include the total pressure loss and the static pressure coefficient.
- Losses in a compressor can be classified into profile loss, mixing loss, 3-D losses, and shock losses.
- The total pressure loss and static pressure coefficient are crucial parameters for a designer as they indicate the efficiency and loading of a compressor respectively.
- The total pressure loss is sensitive to the incidence angle, and an increase in the incidence angle can lead to substantial increase in total pressure loss.