【西门子】2-07 航发热固耦合分析

冲击作用下推进剂变形的流固耦合分析方法
金铭君;李强
【期刊名称】《固体火箭技术》
【年(卷),期】2017(040)002
【摘要】固体火箭发动机的点火过程是一个复杂多变的理化过程,具有时间短、升温、升压梯度大等特点.针对固体火箭发动机点火过程中的装药结构完整性问题,文中建立了一套用于分析冲击作用下固体推进剂变形现象的仿真模型.采用RANS和ALE方法,分剐对流体域和固体域进行求解,以两场独立交叉耦合迭代的模式实现了仿真过程.以一个推进剂冷流冲击实验作为算例,对仿真模型进行了验证,计算值与测量值间误差不超过10％,仿真模型计算可靠,具有向固体火箭发动机实际点火过程拓展的价值.
【总页数】6页(P158-163)
【作者】金铭君;李强
【作者单位】西北工业大学燃烧、热结构与内流场重点实验室,西安710072;西北工业大学燃烧、热结构与内流场重点实验室,西安710072
【正文语种】中文
【中图分类】V512
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Simcenter3D:Gas-Turbine Engine Performance Scott Tucker, Siemens PLMRestricted © Siemens AG 2018Realize innovation.Simcenter PortfolioEngineer innovation for aircraft performanceSimcenter ™Engineer innovation.Simulate. Explore. Test.Driving innovation through SimulationThermo-Mechanical Performance Engineering Thermal managementand aerodynamicsStructural Analysis andThermal FatigueEngine OperatingEfficiencyWhole Engine VibrationDriving innovation through SimulationThermo-Mechanical Performance Engineering Thermal managementand aerodynamicsStructural Analysis andThermal FatigueEngine OperatingEfficiencyWhole Engine VibrationMultiphysics SimulationSimcenter solutionsEngines are governedby physics of aerodynamics, thermal, and structuralNeed scalability to analyze for single physics or multiplephysics.Challenge Single Physics SolutionsBest-in-class solvers. Accurate, robust, consistent, high performance, scalable.One-Way CouplingChain single physics solvers Simcenter Pre/Post.Map response from one physics to load on another.Co-simulationCo-simulate two or more physics solvers.Efficient data exchange.CFD SolutionThermal SolutionStructural SolutionFlow DefinitionsStress and DeflectionsHeat transfer dependence onstructural contactScalable System SimulationSimcenter solutionsAero-engine companies are organized into groups that evaluate whole engine response as well and individualcomponent responses.Need scalability to model systems and components and to map data from one tothe other.ChallengeFEM AssemblyBuild system assembly model from instances of FEM components -analogous to CAD pressor, turbine, fan, casing teams work in parallel.Notification when components are updated and changes and option to acceptBreakout ModelingUse loads from system models on detailed break-out models for lifing predictionsEfficient, Robust Simulation for Engine Operating ConditionsSimcenter solutionsEngines are used onmultiple aircraft, manygeographies, andmany different dutycycles.Need to analyze for allwithout makingerrors.ChallengeCondition SequencesDefine engine state as a set ofparameters that change withoperating conditionExpressions and FieldsUse analytical equations or tabledata to define complex loadingconditions based on parametersChanging parameter valuesupdates the loadingModel Validation and InterrogationSimcenter solutionsBoundary conditions can have spatial and time dependencies.Users need graphical feedback to verify their load definitionsChallenge Pre-ProcessingPreview boundary conditions as contour at specific times, contour animations over time, X-Y plots.Post-ProcessingProbes allow users to predefine or postdefine expressions based on results. 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航空发动机石墨圆周密封流固热多场耦合分析研究近年来，随着航空业的飞速发展，航空发动机作为航空器的“心脏”，在航空器性能和安全保障中起着至关重要的作用。

航空发动机石墨圆周密封流固热多场耦合分析研究，是针对航空发动机中的关键问题，通过多场耦合分析方法进行探索和研究。

本文旨在对该课题进行深入探讨。

一、石墨圆周密封的作用和特点石墨圆周密封作为航空发动机关键部件之一，其作用是防止流体泄漏，确保发动机内部气密性和工作效率。

石墨圆周密封具有良好的密封性能和耐高温性能，能够适应航空发动机复杂的工作环境。

二、流固热多场耦合分析的意义航空发动机工作过程中，石墨圆周密封受到来自流体、固体和热量等多个场的耦合作用。

通过流固热多场耦合分析，可以全面了解石墨圆周密封在复杂工况下的工作状态和性能响应，为优化设计和提高性能提供科学依据。

三、流固热多场耦合分析方法1. 流场分析：对发动机内部流体流动进行模拟和分析，包括速度场、压力场、温度场等，通过建立Navier-Stokes方程和湍流模型等进行数值模拟。

2. 固体力学分析：对石墨圆周密封的结构和变形进行分析，研究其受力情况和振动响应。

采用有限元法进行模拟，考虑密封元件的材料性能和几何特征。

3. 热场分析：研究石墨圆周密封在高温环境下的热传导和热辐射特性，通过建立热传导方程和辐射传热模型等进行数值模拟。

4. 多场耦合分析：将流场分析、固体力学分析和热场分析的结果进行集成和耦合，综合考虑流体、固体和热量等因素的相互影响，得出石墨圆周密封的综合性能响应。

四、分析结果与应用通过流固热多场耦合分析，可以全面了解石墨圆周密封在不同工况下的性能响应和变化情况。

根据分析结果，可以进行参数优化和结构改进，改善密封性能和耐久性，提高航空发动机的工作效率和安全性。

此外，流固热多场耦合分析方法可以应用于其他航空发动机关键部件的研究和设计，进一步提升航空器的整体性能和运行安全性。

总之，航空发动机石墨圆周密封流固热多场耦合分析研究具有重要的理论和实际意义。