Session: 12-04: Film Cooling Computational Studies (II)

Paper Number: 153331

Design Space Exploration Studies on the 777-Shaped Film Cooling Hole With Lattice Boltzmann Method 

In this study, Lattice Boltzmann Method (LBM)-based numerical approach was used to perform a design of experiments study on the publicly available 777-shaped film cooling hole model. The geometric design parameters varied for this study were the forward expansion angle, the lateral expansion angle, and the slot injection angle. The design space consisted of twenty variations of geometric design parameters constructed with a Latin Hybercube distribution. The performance of each design was evaluated for three different blowing rations (BR), 1.0, 2.0, and 3.0.

As a baseline study, extensive validation studies were first performed on the baseline design. Grid sensitivity studies were performed for grid sizes (x+,y+,z+ ) varying between 3 and 20. It was observed that with grid sizes (x+,y+,z+ ) < 5 excellent agreement with experimental data was obtained. For the DOE study, a coarser grid was chosen to reduce the computational cost of the study. The grid size was chosen as a compromise between simulation accuracy and simulation turnaround time.

From this study, it was observed that the best performing hole designs were with larger forward, and lateral expansion angles. It was also observed that for BR = 1.0 these design variations had minimal impact on the film cooling hole performance. The cost of executing the DOE on relatively coarser grid sizes but with a high-fidelity approach like LBM-VLES appears to be feasible by industry standards.

Presenting Author: Avinash Jammalamadaka Dassault Systemes North America

Presenting Author Biography: Avinash Jammalamadaka received his PhD in Mechanical Engineering from Michigan State University in 2013.

Authors:

Avinash Jammalamadaka Dassault Systemes North America
Gregory Laskowski Dassault Systemes North America