In order to predict the ice accretion on whole aircrafts (or largely on three-dimensional elements) it has been developed a simulation environment which uses different codes including both commercial programs (such as CFD++ and Lewice) and research ones (such as PoliMIce). At first all codes are constituted by the aerodynamic field computation (and by the calculation of the trajectories of water droplets and therefore of the collection efficiency), later by the determination of the ice accretion and in the end by those operations which allow the interface among the different codes, such as for example the grid deformation. In this work there are shown the results achieved by the simulations made with the different codes used for the cases of ice accretion, both of rime type (compact ice with opaque aspect due to the instantaneous freezing of the colliding water droplets) and of glaze type (transparent ice characterized by the presence of water in liquid state), on a straight wing wall wedged and on the whole aircraft M-346, which generally compare fairly well with the referential experimental cases.
E’ stato sviluppato un ambiente di simulazione per la previsione dell’accrescimento di ghiaccio su velivoli completi (o più generalmente su elementi tridimensionali) che utilizza diverse procedure comprendenti sia programmi commerciali (come CFD++ e Lewice) che di ricerca (come PoliMIce). Tutte le procedure di calcolo sono costituite in un primo momento dallo studio del campo di moto aerodinamico (e dal calcolo delle traiettorie delle goccioline d’acqua presenti e quindi della collection efficiency), successivamente dal calcolo dell’accrescimento di ghiaccio ed infine da quelle operazioni che permettono l’interfaccia tra le diverse procedure, come ad esempio la deformazione della griglia. In questo lavoro si presentano i risultati ottenuti dalle simulazioni effettuate con le diverse procedure per i casi di accrescimento di ghiaccio, sia di tipo rime (ghiaccio compatto dall’aspetto opaco derivante dall’istantaneo congelamento delle goccioline d’acqua impattanti) che di tipo glaze (ghiaccio trasparente caratterizzato dalla presenza di acqua allo stato liquido), su un’ala dritta incastrata a parete e sul velivolo completo M-346, i quali generalmente mostrano un buon accordo con i casi sperimentali di riferimento.
Sviluppo di un ambiente di simulazione per l'accrescimento di ghiaccio su velivoli completi
BERNASCONI, MARCO
2012/2013
Abstract
In order to predict the ice accretion on whole aircrafts (or largely on three-dimensional elements) it has been developed a simulation environment which uses different codes including both commercial programs (such as CFD++ and Lewice) and research ones (such as PoliMIce). At first all codes are constituted by the aerodynamic field computation (and by the calculation of the trajectories of water droplets and therefore of the collection efficiency), later by the determination of the ice accretion and in the end by those operations which allow the interface among the different codes, such as for example the grid deformation. In this work there are shown the results achieved by the simulations made with the different codes used for the cases of ice accretion, both of rime type (compact ice with opaque aspect due to the instantaneous freezing of the colliding water droplets) and of glaze type (transparent ice characterized by the presence of water in liquid state), on a straight wing wall wedged and on the whole aircraft M-346, which generally compare fairly well with the referential experimental cases.File | Dimensione | Formato | |
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2013_12_Bernasconi.pdf
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https://hdl.handle.net/10589/87161