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Evaluation of a Thermodynamic Ice Crystal Accretion Model using Experimental Data from NASA’s 2nd Fundamental Ice Crystal Icing Test.
| 题名： | Evaluation of a Thermodynamic Ice Crystal Accretion Model using Experimental Data from NASA’s 2nd Fundamental Ice Crystal Icing Test. |
| 作者： | Chen, R; Bartkus, T; Tsao, J; Hardenberg, P. V; Ratvasky, T. |
| 关键词： | Engine icing##Ice crystal icing##Modeling |
| 摘要： | A thermodynamic model describing ice crystal icing is evaluated using experimental datacollected at NASA Propulsion Systems Laboratory. The model makes the distinction betweenice accretions that are "freeze-dominated" and "melt-dominated". Freeze-dominated icingoccurs when partially melted ice crystals impact a surface and freeze. This type of icing ischaracterized by strong adhesion. This contrasts with melt-dominated icing, where un-meltedice crystals adhere to a surface. This type of icing is characterized by weak adhesion. In thispaper, the thermodynamic model is used to analyze the ice growth rates and facility conditionsto explain possible phenomena such as mass loss as well as the melting and freezing fractions.Previousanalysesassumedacollectionefficiencyofunityattheleadingedgeoftheexperimentalmodel. LEWICE is used to determine a better estimate of the collection efficiency at the modelleading edge as ice accretion grows in time. The result shows that the sticking efficiency couldchange in a greater percent with time than previously reported. |
| 总页数： | 20 pages |
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