Session: 13-04 Thermal Performance of Coatings, Ceramic Composites, and Additively Manufactured Metal Hardware

Paper Number: 102756

102756 - Numerical Study of Radiative Heat Transfer Through Next-Gen Thermal Barrier Coating Topcoats 

With the world coming to terms with the consequences of climate change, the aviation sector (accounting for up to 3.5% of global warming) has continued pushing towards increased efficiency to lower emissions. Other than the use of eco-friendly fuels, it is a fact that to achieve higher efficiency and thrust, it is essential to raise the turbine entry temperature in the engine. Increased temperatures in the turbine section intensifies the thermo-mechanical stresses on the hot-end components reducing their life exponentially. Higher temperatures also lead to an increased fraction of heat transfer via radiation, which has been largely neglected in turbine design until recently. Hence, the heat transfer to the substrate needs to be minimized by reflecting or radiating the heat. The goal of this study has been modelling the propagation of electromagnetic radiation through novel thermal barrier coating topcoats focused on reducing radiative heat transport to the super-alloy substrate. The radiation has been modelled with a finite-difference-time-domain approach to gather a broadband response across the target wavelength range. A range of topcoat morphologies were studied to find an optimized structure that minimizes the radiation throughput to the substrate. The results indicate that the finite-difference-time-domain approach to modelling the radiative transfer agrees well with analytical models. This work sets the foundation for future studies, leading to a more accurate understanding of the mixed modes of heat transfer phenomenon in the turbine environment.

Presenting Author: Fiyanshu Kaka Defense Institute of Advanced Technology

Presenting Author Biography: Dr. Kaka is presently working as an Assistant Professor in the School of Material and Chemical Science at Defence Institute of Advanced Technology, Pune. Before joining DIAT, he worked as an Assistant Professor in the Chemical Engineering department at Pandit Deendayal Energy University, Gujarat. He holds a B.Tech. Degree in first class with distinction, in Polymer Science and Chemical Technology from Delhi Technological University (Formerly Delhi College of Engineering). Further, he pursued an integrated Ph.D. from the Indian Institute of Science (IISc) Bangalore. His Ph.D. dissertation proposed a novel in-silico framework comprising a physics-based and data-science model for establishing the process-structure-property relationship in organic photovoltaics. His publication "Investigation of process-structure-property relationship in ternary organic photovoltaics" was featured on the cover of the Journal of Applied Physics as well as on the home page of AIP. Dr. Kaka was granted financial support by JNCASR from the DST-Synchrotron-Neutron project to conduct in-situ experiments at the SOLEIL synchrotron radiation facility, France, in 2020. Additionally, he has received travel grants from Tata-Trusts and Ras Al Khaimah Centre for Advanced Materials for attending international conferences.

Authors:

Jaasim Mulla Defense Institute of Advanced Technology
Radhakanta Satpathy Defense Institute of Advanced Technology
Fiyanshu Kaka Defense Institute of Advanced Technology