Introduction to 3D Flow in Axial Compressors — Lesson 1

This lesson covers the intricate aspects of flow through turbomachineries, focusing on the aerodynamics of turbomachinery. It delves into the two-dimensional understanding of flows and how they evolve into three-dimensional flows in the context of axial flow compressors. The lesson explains how the rotational nature of the blades introduces three-dimensionality and how the flow acquires a radial component. It also discusses the repercussions of this three-dimensionality on the design and analysis of turbomachinery. The lesson further explores the concept of passage vortex and how it contributes to the three-dimensionality of the flow. It concludes with a discussion on the challenges of predicting the flow through blades and the need for intense analysis in the design process.

Video Highlights

03:53 - Discussion on the complexity of blade shape in axial flow compressors and the impact of pressure ratio.
10:07 - Explanation of how the flow acquires three-dimensionality due to the rotation of the blade and the impact on the design of modern axial flow compressors.
31:36 - Discussion on the impact of the boundary layer development and blockage on the mass flow and thrust of the engine.
48:45 - Discussion on the impact of non-uniform flow on the three-dimensionality of the flow through the rotor blade.

Key Takeaways

- The flow through turbomachineries evolves from a two-dimensional to a three-dimensional nature due to the rotational nature of the blades.
- The three-dimensionality of the flow has significant implications on the design and analysis of turbomachinery.
- The concept of passage vortex is crucial in understanding the three-dimensionality of the flow.
- Predicting the flow through blades is complex and requires intense analysis in the design process.
- The lesson introduces the concept of radial equilibrium theory for capturing the three-dimensionality of the flow in a simple mathematical form.