Session: 33-02 Deposition and erosion in hot engine components

Paper Number: 152992

Modeling Deposition in Gas Turbines With Conjugate Mesh-Morphing and Temperature Sensitivity 

A versatile procedure is presented for simulating the growth and thermal impact of deposition in representative gas turbine cooling circuit geometries. The methodology incorporates computational fluid dynamics using ANSYS Fluent to solve the flow field, predicts particle impacts and deposits with the temperature sensitive Ohio State University (OSU) deposition model, and implements dynamic mesh-morphing of both the fluid and solid domains to simulate the evolution of the deposit structure. Initial impinging jet experiments are conducted at 978K with aerosolized Arizona Road Dust (ARD 0-10µm) impacting an unheated target. The deposit cone evolution is used to calibrate and refine the simulation procedure to improve its stability during movement of the mesh and ability to capture the complex structure of growing deposits. Subsequent tests are conducted in an effusion cooling deposition facility (ECDF), where an effusion plate is heated to 1144K with coolant supplied at varying temperatures (811-978K) at a constant backflow margin of 3%. ARD (0-10 µm) is injected and the reduction in coolant mass flow is monitored. The results illustrate that higher flow temperatures lead to a faster reduction in coolant mass flow as well as variations in the deposit structure within the effusion holes. The proposed simulation procedure is validated against experimental results from the ECDF, highlighting significant similarities in coolant reduction rates and deposit structures. The temperature sensitive OSU deposition model effectively captures the temperature dependent increase in deposition, while the computational simulations offer insight into the formation of hole deposits. The potential for the employed dynamic mesh-morphing method to capture the significant features of the deposit structures is also discussed.

     

Presenting Author: Jeffrey Bons The Ohio State University

Presenting Author Biography: Dr. Bons received his PhD in Aeronautical and Astronautical Engineering from MIT. He is currently a professor and leads the Turbine Aerothermodynamics laboratory at The Ohio State University. His major fields of research include gas turbine deposition and active flow control applications.

Authors:

Bradley Jacobs The Ohio State University
Jeffrey Bons The Ohio State University