ANSYS CFD在旋轉(zhuǎn)機(jī)械領(lǐng)域的應(yīng)用

1、ANSYS CFD在旋轉(zhuǎn)機(jī)械領(lǐng)域的應(yīng)用目錄葉輪機(jī)械設(shè)計流程葉型設(shè)計工具新功能2.5維性能快速評估工具新功能網(wǎng)格劃分工具新功能流場分析工具新功能2葉輪機(jī)械的范圍Broad product range - compressors, turbines (gas, hydraulic, steam, wind),turbochargers, pumps, fans Users demand ongoing improvementsMust increase efficiency, reliability anddurability while reducing emissions and noiseT

2、he easy gains have already been taken. Need better tools to get to the next level3葉輪機(jī)械設(shè)計流程明確設(shè)計點工況：轉(zhuǎn)速、流量、壓比、效率葉型設(shè)計葉輪機(jī)械氣動仿真網(wǎng)格生成單級/多級穩(wěn)態(tài)/瞬態(tài)仿真Blade ModelerTurbo grid/ICEM每級進(jìn)出口速度場設(shè)計：速度三角形設(shè)計單級/多級葉輪2.5維快速評估Vista TF/Turbo SystemCFXANSYS 產(chǎn)品Vista（AFD,CCD,CPD RTD）帶冷卻仿真流固耦合及強(qiáng)度校核CFX/Fluent+Mechanical4目錄葉輪機(jī)械設(shè)計流程葉型

3、設(shè)計工具新功能2.5維性能快速評估工具新功能網(wǎng)格劃分工具新功能流場分析工具新功能5已有功能：零維設(shè)計Vista 系列模塊可設(shè)計的類別：離心壓氣機(jī)向心渦輪軸流風(fēng)扇離心泵6已有功能：三維葉型設(shè)計7已有功能：三維葉型編輯8新功能:基于加工方法的葉型設(shè)計方法Used primarily for automotive turbocharger andindustrial compressorsBladeModeler supports flank milled process with controls for blade ruling line distributionsConsistent geom

4、etry represented in all tools for flank milled blades (design, aerodynamic analysis, mechanical analysis and manufacturing)ANSYS9 2017 ANSYS, Inc.ANSYS Confidential目錄葉輪機(jī)械設(shè)計流程葉型設(shè)計工具新功能2.5維性能快速評估工具新功能網(wǎng)格劃分工具新功能流場分析工具新功能10已有功能11Improved Turbo Setup ComponentSystemtoCreate, modify and delete operating po

5、ints more easily map compressor performancePlot chart of solved operating pointsCompare speedlines for different compressor designs新功能12目錄葉輪機(jī)械設(shè)計流程葉型設(shè)計工具新功能2.5維性能快速評估工具新功能網(wǎng)格劃分工具新功能流場分析工具新功能13High quality hexahedral gridsRepeatable & scalableAxial, radial, mixed flow geometries14TurboGrid已有功 能TurboGri

6、d新功能TurboGrid:專業(yè)葉輪機(jī)械網(wǎng)格工具M(jìn)esh QualityEnhanced tip topologyImproved boundary layer meshresolution control New target max. expansion rateTurboGrid: 網(wǎng)格質(zhì)量增強(qiáng)Improved tip gap mesh quality at the rounded leading edge and the cut-off trailing edge of a turbine bladeAchieved min/max expansion rates are report

7、ed and edges highlighted where above set target max expansion ratesTurboGrid已有功 能TurboGrid新功能ICEM新功能15“Limit Aspect Ratio” in Inlet/Outlet blockAdjusts stream-wise distributions to limit maximum element aspect ratio in boundary layerImproved Inlet/Outlet node distribution for long passagesTurboGrid:

8、 進(jìn)出口分布TurboGrid已有功 能TurboGrid新功能16實現(xiàn)CAD文件導(dǎo)入并可具有圓角CAD surface imported and assignedto topologyExact representationHigh quality parameterizationHigh quality meshTurboGrid已有功 能TurboGrid新功能17目錄葉輪機(jī)械設(shè)計流程葉型設(shè)計工具新功能2.5維性能快速評估工具新功能網(wǎng)格劃分工具新功能流場分析工具新功能18Steady Stage/ Mixing-PlaneTransient Full-DomainTransient wi

9、thPitch-Change單葉片具有較高精度的全環(huán)仿真精度計及非定常影響計及非定常影響的精確計算特性曲線生成低計算成本，快簡化仿真模型一片或幾片葉片需要全環(huán)或部分環(huán)速不計非定常影響低計算 成本高計算成本內(nèi)存CPUANSYS 葉輪機(jī)械分析方法19穩(wěn)態(tài)仿真非常高效的仿真方法可通過pitch-change 方法運行從計算角度講比瞬態(tài)仿真更高效最常用的仿真方法Upstream20Downstream瞬態(tài)仿真的必要性21TBR方法解決的問題問題:如何以較低計算成本進(jìn)行瞬態(tài)分析?基于pit新方法降極大提升解決方法:ch-change方法的ANSYS TBR變換低了葉片數(shù)量計算效率，降低對計算資源的需求2

10、2ANSYS TBR應(yīng)用場景 轉(zhuǎn)靜相互作用 單級& 多級 軸流 & 徑向 擾動 級間抽氣分析 進(jìn)氣畸變 流固耦合 葉片顫振 受迫振動23變量分布在交界面按角度比縮放，確保通量守恒周向標(biāo)準(zhǔn)周期邊界保持真實的葉片數(shù)與幾何形狀計算效率高速度快單級/多級計算在較寬工況范圍內(nèi)保持較高精度在角度比較小時仍可維持頻率在較大面積比時，可通過增加葉片來保持較高的仿 真精度Pitch-Change 方法 變量分布變換法(PT)Implicit & Conserving profile exchange via GGIStandard Periodicity24 進(jìn)口擾動，單級，多級o中等角度比Pitch-Chan

11、ge 方法 時間變換法(TT)Implicit & Conserving profileexchange via GGIStandard Periodicityapplied in computational time 基于時間傾斜法(Giles 88) 顯式計算，湍流，瞬態(tài)模型 標(biāo)準(zhǔn)周期邊界，求解按計算時間進(jìn)行，顯示為物理時間UsPrT Ps Pr TQ E G 0tXYX XY Yt t Y(Q G) E G 0tX Y 25基于 the Shape-Correction method ofL. He (1989) andChorochronic interface periodicity

12、 of Gerolymos (2002)用傅里葉級數(shù)對周向邊界和轉(zhuǎn)靜邊界進(jìn)行求解歷 史數(shù)據(jù)重構(gòu)Pitch-Change 方法 傅里葉變換法(FT) 雙葉片模式 進(jìn)口擾動，單級，多級，葉片顫振，多種擾動o 大角度比(t T )Sampling plane (GGI)(t T )Pitchwise BoundaryNk N kj (kt )(t) A eMNl M k Nk ,le j (ktl )Inter-row interfaces(t, ) A26TBR模型持續(xù)不斷的增速Solution涉及學(xué)科方法氣動, 流固耦合& 傳熱 定常與非定?？焖贉?zhǔn)確的非定常仿真采用范圍間距變化法通過單/雙通道仿

13、真獲得全環(huán)仿真精度，大幅度提升 仿真速度Problem葉片通道內(nèi)流動的精確仿真27后處理界面內(nèi)的實時監(jiān)視穩(wěn)態(tài)監(jiān)視 旋轉(zhuǎn)坐標(biāo)系 批處理模式28Determine blade response due to excitation from neighboring blade rows to calculate fatigue life. Harmonic pressure loads mapped from CFD results.受迫振動29顫振分析Determine if the blade could enter self-sustained harmful vibration (flutter), due to cyclic loading when its undergoing vibration at natural frequency30顫振分析Transient simulation can take between 15 to 30 vibration cycle to convergeTransientReduced geometryFT-method Fast solution R14.5Harmonic Analysis Reduced geometry FT-methodFaster solutionR18.0Aerodamping/Fl