Session: 12-12 Film cooling computational studies (II)

Paper Number: 125187

125187 - CFD Simulation of an S-Bend Diffuser With Passive Full Surface Effusion Cooling: Novel Slot Method Approach 

There are different approaches for CFD simulation of effusion-cooled surfaces, such as the 1D Porous Jump Coefficient and periodic boundary conditions. These methods are used to minimize the cost of simulation; however, each model has its own drawbacks. A novel approach called the "slot method" has been introduced for the first time in this research. In this method, based on the porosity of the effusion patches, the effusion holes are replaced by a limited number of slots to reduce the cost and time of simulations.

The slot method is simulated using the Reynolds-Averaged Navier-Stokes (RANS) methodology to predict the pressure recovery performance of the diffuser, pressure distributions on the walls, outflow velocity distributions, and outflow temperature distributions. The CFD simulations are compared to experimental data of a rectangular S-duct diffuser, as well as CFD simulations with 1D Porous Jump Coefficient boundary conditions reported by NG [1].

Four different numbers of slots are simulated using RANS k-e models to investigate the effect of the number of slots on the main and secondary flows. The simulations show that the higher number of slots can mimic the behavior of the effusion holes. The simulations exhibit significantly more accurate predictions compared to the 1D Porous Jump Coefficient in terms of pressure recovery performance in the diffuser. Some discrepancies between the experimental data and the slot method in the outflow velocity distribution can be attributed to imprecise boundary conditions in the reported experimental data.

Presenting Author: Hossein Moradi Queens University

Presenting Author Biography: I am a third-year Ph.D. student in the Mechanical and Material Engineering Department at Queens University focusing on cooling GT engines through the 'Effusion Cooling Technique'. I have extensive experience designing and simulating various cooling systems using the ANSYS Fluent package. Moreover, I have extensive experience in experimental research and am currently conducting tests on effusion cooling in a diffuser at the HOT GAS WIND TUNNEL at Queens University.

Authors:

Hossein Moradi Queens University
Albrecht Michael Birk Queens University