Webinars
Upcoming
Contrail formation is one of the most significant non-CO2 climate impacts of aircraft operations, outweighing the radiative forcing from CO2 emissions by almost a factor of two. Understanding differences in microphysical evolution and optical characteristics between contrails produced by traditional and carbon-free aviation fuels is, therefore, crucial to ensuring the successful development of climate-friendly propulsion systems. While ammonia is considered a promising hydrogen-based fuel alternative, its contrail formation and persistence characteristics remain uncertain owing to unique thermodynamic conditions in the aircraft’s wake. While soot, acting as a primary nucleation site in contrails produced by traditional fuels, is absent in the ammonia-system’s exhaust, water vapor emissions are significantly increased, and contrail nucleation may still occur on ambient aerosol populations at upper tropospheric levels. To assess the climate impacts of ammonia-powered contrails, a specialized CFD contrail module has been developed within the atmospheric code Meso-NH, based on the microphysical parameterization LIMA (Liquid Ice Multiple Aerosols) and coupled with anelastic and pseudo-incompressible formulations. To reconcile the significantly varying spatial and temporal scales throughout a contrail’s lifetime, the model couples two temporal LES domains specialized to the jet, vortex, and early-dissipation regimes by superimposing synthetic atmospheric and wake-turbulence fields. The development of this model paves the way to enabling the first detailed simulation-backed comparison of optical and persistence characteristics between contrails produced by ammonia and kerosene.
Archived
Aerodynamic Study of Boeing 737-800 and Truss-Braced Wing Aircrafts Using CFD Techniques
A Comprehensive Optimizer for Multi-Objective and Multidisciplinary Applications
Axial Fan Optimization for High-Bypass SOFC-C-GT Hybrid System
An Exploration of Ammonia NOx Emissions Using CFD
Tennessee Tech
University’s Pressurized SOFC Test Stand Updates and Progress Through 2024
Investigation of Ammonia Fed SOFCC-GT Hybrid System for Commercial Aviation
Design and Manufacture of an Anode Ejector to Boost System Efficiency of a 1kW SOFC
Zero/Low Emission Commercial Aircraft Powered by Solid Oxide Fuel Cell Turbogenerator Hybrid
Design and Operation of Solid Oxide Electrochemical Cell Systems for Space Applications
SWaP Analysis and Optimization for SOFC-C Hybrid System for Commercial Aviation
Modeling of a SOFC Combustor Hybrid Cycle for Commercial Electric Aviation