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Influence Factors for Impact Actions and Transient Trajectories of Fan Blades after Fan Blade Out in Typical 2-Shaft High Bypass Ratio Turbofan engine

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Journal of Thermal Science 2022年第1期31卷 96-110页

作者： XU Xue LI Hongxin FENG Guoquan Shenyang engine Research Institute Aero Engine Corporation of ChinaShenyang 110015China corporation Headquarter Aero Engine Corporation of ChinaBeijing 100097China

To enhance the understanding of design characters, which have prominent influences during the fan blade out event, a simplified geometrical and dynamic analysis method was derived, and a typical 2-shaft high bypass ratio turbofan engine was selected and modeled. Based on analytical deriving and engineering experience learned from the real engine failure case, three determinative impact actions were recognized from the fan blade out process. The transient trajectories of these impact actions were researched in analytical method, and then thickness of acoustic lining, quantity of fan blades and threshold load of structural fuse were analyzed as key design characters. 36 serialized fan blade out transient dynamic simulations were conducted by using the 2-shaft high bypass ratio turbofan engine model within different combinations of the three key design factors. The results from geometrical and dynamic analysis matched mainly well with the results from simulations. Characteristic phenomenon in simulation can be explained theoretically. Five conclusions can be summarized from these results. (1) If thickness fan acoustic lining was thinner, the deviation between simplified analytical calculation and simulation were not outstanding to predict Blade-Casing the first impact time and angular position. (2) An appropriate thickness of acoustic lining could make a lower impact stress of fan casing at the first impact. (3) Different thickness of acoustic linings leaded to two impact modes for blade 2, which were tip impact and root impact. (4) Different impact conditions between blade 1 and blade 2 caused remarkable speed components distinction of blade 1, and leaded to a wide range of transient trajectory of blade 1 during FBO event. (5) Thicker acoustic lining in this research can usually find the porper threshold loads setting, which can give a satisfactory outbound vibration. Two details were raised for further research, which were impact behavior of composite material fan bl

关键词： fan blade out transient trajectory design character structural fuse high bypass ratio turbofan

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Design and application of an air-cooled probe for total pressure measurement at combustor outlet

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航空动力学报 2019年第1期34卷 34-44页

作者： LIU Xupeng SUN Qi WANG Xiaoliang XUE Xiusheng YIN Dong Shenyang engine Research Institute Aero Engine Corporation of China

An air-cooled probe was designed for measurement of total pressure at combustor outlet;its cooling scheme combined the film cooling and convection *** the aid of CFD technique,cooling effectiveness of the coolant jets at various blow ratios was compared;suitable blow ratios and configuration of film holes were chosen *** overall cooling performance of the probe was evaluated via CFD technique,the design was improved according to the simulation result,and the cooling effect of the leading edge was obviously strengthened by increasing the local coolant mass flow *** results of wind tunnel test indicated that,between Mach numbers 0.2 and 0.4,the probe achieved a high accuracy at various attack *** probe was utilized in an annular combustor rig test,the highest temperature reached 1 760 Kand total pressure reaches 1 036 *** result of rig test demonstrates that the coolant film distribution consistent appropriately with the CFD results.

关键词： high temperature measurement total pressure probe film cooling CFD combustor outlet

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Review of Numerical Simulation of TGO Growth in Thermal Barrier Coatings

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Computer Modeling in engineering & Sciences 2022年第8期132卷 361-391页

作者： Quan Wen Fulei Jing Changxian Zhang Shibai Tang Junjie Yang aero engine Academy of china Aero Engine(Group)Corporation of ChinaBeijing101304China Institute for aero engine Tsinghua UniversityBeijing100084China

Thermally grown oxide(TGO)is a critical factor for the service life of thermal barrier coatings(TBC).Numerical simulations of the growth process of TGO have become an effective means of comprehensively understanding the progressive damage of the TBC *** present,technologies of numerical simulation to TGO growth include two categories:coupled chemical-mechanical methods and mechanical equivalent *** former is based on the diffusion analysis of oxidizing elements,which can describe the influence of bond coat(BC)consumption and phase transformation in the growth process of TGO on the mechanical behavior of each layer of TBC,and has high accuracy for the thickness evolution of TGO,but they cannot describe the lateral growth of TGO and the rumpling phenomenon *** latter focuses on describing the final stress and strain state after the growth of a specific TGO rather than the complete growth processes of *** on the measured TGO thickness growth curve,simulations of thickening and lateral growth can be achieved by directly applying anisotropic volumetric strain to oxidized elements and switching elements properties from the BC to the TGO.

关键词： Thermal grown oxide(TGO) numerical simulation thermal barriers coatings(TBC) finite element method lateral growth

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Development of secondary flow field under rotating condition in a straight channel with square cross-section

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Chinese Journal of aeronautics 2018年第8期31卷 1703-1715页

作者： Ruquan YOU Kuan WEI Zhi TAO Haiwang LI Guoqiang XU National Key Laboratory of Science and Technology on aero-engines aero-Thermodynamics Beihang University Collaborative Innovation Center for Advanced aero-engine Beihang University aero engine Academy of china Aero Engine (Group) Corporation of China

The developing secondary flow fields in the entrance section of a rotating straight channel were experimentally investigated using Particle Image Velocimetry（PIV）. The effects of streamwise position, Reynolds number and rotation number on the development of the secondary flow fields were revealed. The results show that the absolute values of vorticity flux of the trailing side roll cells increase with increasing radius of the measured plane and rotation number. When the absolute value of vorticity flux exceeds a critical value, the merging of the trailing side roll cells appears. Moreover, when the number of the trailing side vortex pairs is even, the absolute values of vorticity flux of the leading side vortices increase along streamwise direction. Otherwise, the absolute values decrease along the streamwise direction. By the circulation analysis, this phenomenon was found to have relationship with the merging of the trailing side roll cells, and further concluded that the secondary flow field in a rotating channel has to be treated as a whole. At last,the increase of the Reynolds number was found to be able to induce the merging position moves upstream.

关键词： Circulation analysis Entrance section Field Programmable GataArray (FPGA) Particle Image Velocimetry(PlV) Rotating channel Secondary flow

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Stress-controlled LCF experiments and ratcheting behaviour simulation of a nickel-based single crystal superalloy with [001] orientation

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Chinese Journal of aeronautics 2021年第8期34卷 112-121页

作者： Bin ZHANG Rongqiao WANG Dianyin HU Kanghe JIANG Jianxing MAO Fulei JING Xinyi HAO School of Energy Power EngineeringBeihang UniversityBeijing 100083China Beijing Key Laboratory of aero-engine Structure and Strength Beijing 100083China Research Institute of aero-engine Beihang UniversityBeijing 100083China Hunan Aviation Powerplant Research Institute Aero Engine(Group)Corporation of ChinaZhuzhou 412002China aero engine Academy of china Aero Engine(Group)Corporation of ChinaBeijing 101304China

Uniaxial ratcheting behaviour and low cycle fatigue(LCF)failure mechanism of nickel-based single crystal superalloy DD6 with[001]orientation are investigated through the stresscontrolled LCF tests with stress ratio *** the deformation behaviour during the wholelifetime from the beginning of the experiment to the fracture of the specimen,as well as the fractographic/metallographic morphology,are compared with the strain-controlled LCF experimental *** the scanning electron microscope(SEM)observations,it is shown that the failure characteristics under stress-controlled LCF loading are similar with those under strain-controlled ***,unlike strain-controlled LCF loading,even under fully reversed cycle loading for stress-controlled LCF,DD6 shows significant ratcheting behaviour due to the tensioncompression *** addition,the LCF lifetimes under stress control are significantly shorter than the LCF lifetimes under strain control,and the culprit might be the detrimental effect of ratcheting strain on LCF *** on these phenomena,an improved crystal plasticity constitutive model on the basis of slip-based Walker constitutive model is developed through modifying the kinematic hardening rule in order to overcome the inaccurate prediction of decelerating stageand stable stage of ratcheting ***,combining the continuum damage mechanics,a damage-coupled crystal plasticity constitutive model is proposed to reflect the damage behaviour of DD6 and the accelerating stage of ratcheting *** simulation results for the stress-controlled LCF deformation behaviour including the whole-lifetime ratcheting behaviour show good agreement with the experimental data.

关键词： Crystal plasticity constitutive model Low cycle fatigue Nickel-based single crystal superalloy Ratcheting behaviour Stress-controlled experiment

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Macro-phenomenological high-strain-rate elastic fracture model for ice-impact simulations

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Chinese Journal of aeronautics 2023年第3期36卷 146-160页

作者： Jiang FAN Qinghao YUAN Fulei JING Guangchen BAI Xiuli SHEN School of Energy and Power engineering Beihang UniversityBeijing 100191China Beijing Key Laboratory of aero-engine Structure and Strength Beijing 100191China Collaborative Innovation Center of Advanced aero-engine Beijing 100191China aero-engine Academy of china Aero Engine(Group)Corporation of ChinaBeijing 101304China

The ice impact can cause a severe damage to an aircraft’s exposed structure,thus,requiring its *** numerical simulation represents an effective method to overcome this *** establishment of the ice material model is ***,ice is not a common structural material and exhibits an extremely complex material *** material models of ice reported so far are not able to accurately simulate the ice behavior at high strain *** study proposes a novel high-precision macro-phenomenological elastic fracture model based on the brittle behavior of ice at high strain *** developed model has been compared with five reported models by using the smoothed particle hydrodynamics method so as to simulate the ice-impact process with respect to the impact speeds and ice *** important metrics and phenomena(impact force history,deformation and fragmentation of the ice projectile and deflection of the target)were compared with the experimental data reported in the *** findings obtained from the developed model are observed to be most consistent with the experimental data,which demonstrates that the model represents the basic physics and phenomena governing the ice impact at high strain *** developed model includes a relatively fewer number of material ***,the used parameters have a clear physical meaning and can be directly obtained through ***,no adjustment of any material parameter is needed,and the consumption duration is also *** advantages indicate that the developed model is suitable for simulating the iceimpact process and can be applied for the anti-ice impact design in aviation.

关键词： Crack propagation Elastic fracture High strain rate Ice impact Impact force Material model

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Characterization and mechanical modeling of interfacial damage in EB-PVD thermal barrier coatings considering multiple failure factors

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Journal of Materials Science & Technology 2024年第23期190卷 42-55页

作者： Dianyin Hu Zhengzhe Lv Haiyan Liu Fulei Jing Yan Zhao Shenyu Zhang Hao Du Rongqiao Wang Research Institute of aero-engine Beihang UniversityBeijing 100191China Beijing Key Laboratory of aero-engine Structure and Strength Beijing 100191China United Research Center of Mid-Small aero-engine Beijing 100191China aero engine Academy of china Aero Engine(Group)Corporation of ChinaBeijing 101304China School of Energy and Power engineering Beihang UniversityBeijing 100191China

In this work,heat treatment experiments at 1050 and 1100℃were carried out on single-crystal su-peralloy specimens coated with the electron beam physical vapor deposition(EB-PVD)thermal barrier coating(TBC)***,the evolution of microstructural characteristics and sintering-induced mechanical properties were separately obtained by the field emission scanning electron microscope(FE-SEM)and nanoindenter,providing inputs for damage ***,the critical compressive strain of TBCs at room temperature was acquired using 3D digital image correlation(3D-DIC)technology to characterize the interfacial damage combined with the experimentally observed buckling *** re-sults demonstrate that not only does oxidative damage exist in the TBCs system due to thermally grown oxide(TGO)growth,but additional damage is generated by thermal cycling and sintering behavior,***,a nonlinear cumulative interfacial damage model considering multiple failure factors is developed to predict TBCs’*** error between the measured damage and calculated damage is less than 15%,showing good prediction accuracy.

关键词： Thermal barrier coatings Critical compressive strain Multiple failure factors Damage model

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Large eddy simulation of turbulent premixed piloted flame using artificial thickened flame model coupled with tabulated chemistry

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Applied Mathematics and Mechanics(English Edition) 2018年第9期39卷 1277-1294页

作者： Zhou YU Hongda ZHANG Taohong YE Minming ZHU Department of Thermal Science and Energy engineering University of Science and Technology of China Shenyang engine Research Institute Aero Engine (Group) Corporation of China

A sub-grid scale(SGS) combustion model, which combines the artificial thickened flame(ATF) model with the flamelet generated manifold(FGM) tabulation method, is proposed. Based on the analysis of laminar flame structures, two self-contained flame sensors are used to track the diffusion and reaction processes with different spatial scales in the flame front, respectively. The dynamic formulation for the proposed SGS combustion model is also performed. Large eddy simulations(LESs) of Bunsen flame F3 are used to evaluate the different SGS combustion models. The results show that the proposed SGS model has the ability in predicting the distributions of temperature and velocity reasonably, while the predictions for the distributions of some species need further improvement. The snapshots of instantaneous normalized progress variables reveal that the flame is more remarkably and severely wrinkled at the flame tip for flame *** satisfactory results obtained by the dynamic model indicate that it can preserve the premixed flame propagation characteristics better.

关键词： large eddy simulation(LES) artificial thickened flame model tabulation dynamic modeling flame sensor

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Performance evaluation of creep feed grinding ofγ-TiAl intermetallics with electroplated diamond wheels

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Chinese Journal of aeronautics 2021年第6期34卷 100-109页

作者： Xinxin XI Wenfeng DING Zhixin WU Lama ANGGEI College of Mechanical and Electrical engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Shenyang Liming aero-engine Co. Ltd.Aero-Engine Corporation of ChinaShenyang 110043China

This paper evaluates the performance of creep feed grindingγ-TiAl intermetallic(Ti-45 Al-2 Mn-2 Nb)using electroplated diamond ***,a comparative analysis with the grinding results by using electroplated CBN wheels was conducted,mainly involving abrasive wheel wear behavior and maximum material removal rate below surface burn *** was found that the diamond wheel would produce much better grinding results including lower wheel wear rate and higher maximum material removal *** the surface integrity obtained at different level of material removal rate was characterized with the utilization of the diamond *** poor ductility of thisγ-TiAl intermetallic material was found to have a marginal effect on the surface integrity,as no severe surface defects such as material pullout were generated during the stable wheel wear *** the involved operating parameters,a deformation layer was produced with~10μm or more in thickness depending on the material removal rate ***,a work-hardened layer extending to more than 100μm was produced with a maximum microhardness of above 520 HV0.05(bulk value 360 HV0.05).The residual stress remained compressive,with a value of above-100 MPa and even up to-500 MPa for an elevated material removal *** chip was the main chip type,indicating good wheel sharpness in the grinding process.

关键词： Creep feed grinding Electroplated abrasive wheels Surface integrity Wheel wear γ-TiAl intermetallic

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Large eddy simulation of turbulent premixed and stratified combustion using flame surface density model coupled with tabulation method

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Applied Mathematics and Mechanics(English Edition) 2018年第12期39卷 1719-1736页

Large eddy simulations(LESs) are performed to investigate the Cambridge premixed and stratified flames, SwB1 and SwB5, respectively. The flame surface density(FSD) model incorporated with two different wrinkling factor models, i.e., the Muppala and Charlette2 wrinkling factor models, is used to describe combustion/turbulence interaction, and the flamelet generated manifolds(FGM) method is employed to determine major scalars. This coupled sub-grid scale(SGS) combustion model is named as the FSD-FGM model. The FGM method can provide the detailed species in the flame which cannot be obtained from the origin FSD model. The LES results show that the FSD-FGM model has the ability of describing flame propagation, especially for stratified flames. The Charlette2 wrinkling factor model performs better than the Muppala wrinkling factor model in predicting the flame surface area change by the *** combustion characteristics are analyzed in detail by the flame index and probability distributions of the equivalence ratio and the orientation angle, which confirms that for the investigated stratified flame, the dominant combustion modes in the upstream and downstream regions are the premixed mode and the back-supported mode, respectively.

关键词： large eddy simulation(LES) flame surface density(FSD) model tabulation premixed combustion stratified combustion

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