Eulerian–Lagrangian CFD-microphysics modeling of a near-field contrail from a realistic turbofan
| Autor: | Mohamed Chouak, François Morency, François Garnier, Sébastien Cantin |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Coupling 010504 meteorology & atmospheric sciences Microphysics business.industry Mechanical Engineering Aerospace Engineering Climate change Ocean Engineering Near and far field Mechanics Computational fluid dynamics Radiative forcing 01 natural sciences 010305 fluids & plasmas Turbofan Eulerian lagrangian 0103 physical sciences Automotive Engineering business Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences |
| Zdroj: | International Journal of Engine Research. 23:661-677 |
| ISSN: | 2041-3149 1468-0874 |
| DOI: | 10.1177/1468087421993961 |
| Popis: | Aircraft contrails contribute to climate change through global radiative forcing. As part of the general effort aimed at developing reliable decision-making tools, this paper demonstrates the feasibility of implementing a Lagrangian ice microphysical module in a commercial CFD code to characterize the early development of near-field contrails. While engine jets are highly parameterized in most existing models in a way that neglects the nozzle exit-related aspects, our model accounts for the geometric complexity of modern turbofan exhausts. The modeling strategy is based on three-dimensional URANS simulations of an aircraft nozzle exit involving a bypass and a core jet (Eulerian gas phase). Solid soot and ice particles (dispersed phase) are individually tracked using a Lagrangian approach. The implemented microphysical module accounts for the main process of water-vapor condensation on pre-activated soot particles known as heterogeneous condensation. The predictive capabilities of the proposed model are demonstrated through a comprehensive validation set based on the jet-flow dynamics and turbulence statistics in the case of compressible, turbulent coaxial jets. Simulations of contrail formation from a realistic nozzle-exit geometry of the CFM56-3 engine (short-cowl nozzle delivering a dual stream jet with a bypass rate of 5.3) were also carried out in typical cruise flight conditions ensuring contrail formation. The model provides reliable predictions in terms of the plume dilution and ice-particle properties as compared to available in-flight and numerical data. Such a model can then be used to characterize the impact of nozzle-exit parameters on the optical and microphysical properties of near-field contrails. |
| Databáze: | OpenAIRE |
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