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A thermodynamic model for ice crystal accretion in aircraft engines:EMM-C

机译：飞机发动机冰晶增生的热力学模型：EMM-C

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摘要

Ingestion of high-altitude ice particles can be hazardous to aircraft engines in flight. Ice accretion may occur in the compression system, leading to blockage of the core gas path, blade damage and/or engine flameout. Numerous engine powerloss events since 1990 have been attributed to this mechanism. An expansion in engine certification requirements to incorporate ice crystal conditions has spurred efforts to develop analytical models for phenomenon. A necessary component of a complete icing simulation is a thermodynamic accretion model. In this paper, a new model for ice crystal icing is developed through adaptation of the Extended Messinger Model (EMM) from supercooled water conditions to mixed phase conditions (ice crystals and supercooled water). The new model is termed the Extended Messinger Model -Crystals (EMM-C). Continuity and energy balances are performed using the local flow conditions and impinging mass fluxes of ice and water. For accretions grown on a warm engine surface, initially above freezing temperature, a novel three-layer (water-ice-water) accretion structure is proposed, and the underlying equations described. Finally, predictions from the EMM-C model are compared to experimental results generated in an ice crystal wind tunnel. Compared with current literature icing models, EMM-C provides a tractable framework for modelling engine icing through allowing mixed phase accretions on warm surfaces.
机译：摄入高空冰颗粒可能对飞行中的飞机发动机有害。可以在压缩系统中发生冰量，导致核心气体路径堵塞，叶片损坏和/或发动机熄火。自1990年以来的众多发动机Powerloss事件归因于这种机制。在发动机认证要求中扩展融合冰晶条件的努力开发出于现象的分析模型。完整结冰模拟的必要组件是热力学吸收模型。在本文中，通过将延长的Messinger模型（EMM）从过冷水条件从超级冷却水条件进行调整到混合相条件（冰晶和过冷水）来开发新模型。新模型被称为扩展Messinger模型 - 译员（EMM-C）。使用局部流动条件和撞击冰水和水的质量通量进行连续性和能量余额。对于在温热发动机表面上生长的吸收，最初提出了一种新的三层（水 - 冰水）吸收结构，并且描述的底层方程。最后，将EMM-C模型的预测与冰晶风隧道中产生的实验结果进行比较。与目前的文献结冰模型相比，EMM-C提供了一种用于建模发动机结冰的框架，通过允许在温暖的表面上混合相位吸引力。

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