FLOW THROUGH STEAM TURBINE CASCADE FOR ROUGHNESS ANALYSIS

Abstract

The flow of liquids is essential to our understanding of the world. Traditionally, this is done by studying the flow of liquids using wind tunnels in the model. However, the field of computer fluid dynamics has been born over the past century. A program that can model fluid flow is CFD software. Gambit 2.4.6 created a three-dimensional geometry of four reaction blades with a square cascade and studied the secondary losses using FLUENT 6.2. The air is chosen as a working material. Air passes through the turbine cascade at a maximum input speed of 102 m/s. The cascade opens to the atmosphere when exiting. Firstly, the two surfaces of the blade cascade have been smoothed and the secondary losses analyzed. This total flow loss was compared with a roughness applied individually to the suction and pressure surfaces of 250 microns, 750 microns, and 1000 microns in thickness and examined the effect of the thickness on flow loss.

Keywords

• blade surface
• effect of roughness
• end loss phenomena
• loss coefficient