2-07 航发热固耦合分析

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. Efficient way to process results.Air Temp = .85*T26+.003*T26*(radius-224[mm])Thermal Boundary ConditionsSimcenter solutionsChallenge Turbine-centric Boundary ConditionsStream, Void, and Convecting Zone boundary conditions simulate the key convection physics.Expressions and parameters account for interdependencies between flow boundary conditions Boundary conditions usable by thermal, structural, and coupled solutionsProprietary correlations can be customized and accessed through the expressions API.Specialized convective physics needed for thermal simulation of enginesystems.Proprietarycorrelations needed in thermal analyses.Thermo-Mechanical Performance EngineeringDriving innovation through SimulationThermo-Mechanical Performance Engineering Thermal managementand aerodynamicsStructural Analysis andThermal FatigueEngine OperatingEfficiencyWhole Engine VibrationBlade DurabilitySimcenter solutionsDesign blades to meet required number of operation hours without failureChallenge Detailed cyclic symmetry models Significant model size reductionWorst principle stressesView results over all cyclic sectors and find worst stressAdvanced Material ModelingSimcenter solutionsAero-engines depend on high performance materials that operate in extreme conditionsNeed ability to accurately model nonlinear behavior ofmaterials.Need ability to manage materials.Challenge Temperature Dependent Plasticity and Creep MaterialsMulitilinear plasticity models with hardeningHigh temperature creep materials User-DefinedLink in proprietary advanced material modelsDamagePlay failure and delamination models for compositesMaterial DatabasesLinks to commercial or in-house material databasesManufacturing and Assembly SimulationSimcenter solutionsAero-engines are assembled in stages with press fits and bolt tightening sequences.Need to understand the stress and deflections from the assembly process and include pre-stress effects with serviceloadsChallengeMultistep Solutions•Add components in a series of steps•Sequence the actual tightening of bolts•Evaluate effect of bolt failure Initial Strain•Include residual stress/strain from manufacturing into components of an assemblyThermo-Mechanical Performance EngineeringDriving innovation through SimulationThermo-Mechanical Performance Engineering Thermal managementand aerodynamicsStructural Analysis andThermal FatigueEngine OperatingEfficiencyWhole Engine VibrationLight-Weighting Fan BladesSimcenter solutionsReduce fan blade weight to spin faster, move moreair, and give better performance.ChallengeInterface to Design andManufacturingSimulate curing processManufacturing producibilityCompositesstructural analysisPerformancevalidation3D CADManufacturingdatasetCompositesdesignAnalyze for strength andstiffnessPrediction of failureBlade Manufacture Shape Hot-to-Cold SolutionSimcenter solutionsBlade geometry is first defined for operating shapeOperating shape is the manufactured shape + deformation from thermal and pressure loadsHow do you reverse engineer to get manufactured shape?ChallengePressure and thermal loads mapped from CFD to structural “Unrun” structural solution for hot to cold –start withoperating FEM shape and iterate tomanufactured FEM shapeCreate new deformed geometryOperating Geometry (Hot)Manufactured Geometry (Cold)Predict Tip Clearance to Optimize Engine PerformanceSimcenter solutionsMinimize clearance between blades and case tooptimize engine performanceChallenge 2D System Modeling Only way to model full engine systemThermal-Mechanical CouplingInclude thermal andstructural loads and their interactionsClearanceUse expression to quickly compute clearanceOptimize Engine Performance at all Engine SpeedsSimcenter solutionsCompressors are unstable at low speeds.Variable stator angles adjust air flow for speed changes and maintain stability and performanceChallengeFE KinematicsFE model of blades with large rotationStress EvaluationEnsure that stresses are acceptable for complete range of motionCOMPRESSORLow PressureHigh PressureThermo-Mechanical Performance EngineeringDriving innovation through SimulationThermo-Mechanical Performance Engineering Thermal managementand aerodynamicsStructural Analysis andThermal FatigueEngine OperatingEfficiencyWhole Engine VibrationEngine VibrationSimcenter solutionsPredict critical operating speeds where vibration areexcessive Predict engine survivability from blade-out unbalancePredict vibration loads in bearingsChallenge Handling of large modelsEfficient model reduction for large modelsFlexibility3D, 1D, 2D representations, (multi stage) cyclic symmetry,mixed models, combining different reference frames, bearings and linking devices modelingAdvanced technologySimulations accuracy enabling local non linearities in transient and harmonic responsesHow are Simcenter gas turbine customers benefitting?Assessment of designchanges: from months,weeks and days to hours !Cumulated time savings reaching entire years Up to25%-50%time savings for complete engine development Better designs, faster!Up to 20times fasterdesign iterationsThank You!。