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Chinese Journal of Aeronautics 2022年第1期35卷 388-397页

作者： Haibing YU Tiefeng CHEN Yanjie QIU aecc commercial aircraft engine co. LTDShanghai 200241China

The aero engine turbine rotors are under strong centrifugal load and the highest thermal *** ventilation openings on the rotors are inevitable,because air flow need to pass through them to co.l the temperatures down and keep the air pressure balanced in internal aero *** ventilation openings will lead to stress co.centration *** this paper,the stress co.centration factor of elliptical opening on rotating disc is deduced by superposition *** to define the optimal location and shape of the elliptical opening on rotating disc to decrease the stress co.centration effect has been investigated *** reliability and accuracy of the theoretical deviation process is verified by Finite Element Method(FEM).The process of how to obtain the optimal location of the elliptical ventilation opening with particular shape on turbine sealing disc is described as an engineering application *** investigation provides sufficient theoretical support for optimal location and shape definition of elliptical ventilation opening on aero engine rotors with stress co.centration effect by pure mechanics co.sideration.

关键词： Aero engine Elliptical ventilation opening Finite Element Method(FEM) Rotor Stress co.centration

Effects of pressure oscillation on aerodynamic characteristics in an aero-engine co.bustor

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Chinese Journal of Aeronautics 2021年第2期34卷 454-465页

作者： Hao QIN Guanqiong TANG Xionghui WANG Design and Research Center AECC Commercial Aircraft Engine Co.Ltd.Shanghai 200241China

The effects of pressure oscillation on aerodynamic characteristics in an aero-engine co.bustor are investigated. A co.bustor test rig is designed to simulate the pressure drop characteristics of a practical annular co.bustor. The pressure drop characteristics are firstly measured under atmosphere co.dition with non-reacting flow(or co.d flow), and the air mass flow proportion of each co.ponent(dome/liner) are obtained;these properties are base lines for co.parison with co.bustion state. The co.bustion tests are then carried out under co.ditions of inlet temperature 340–450 K, fuel air ratio 0.010–0.028. The stability map and the oscillation frequencies are obtained in the tests, the results show that pressure oscillation amplitude increases with the increase of fuel air ratio. Phase trajectory reco.struction is applied to classify the pressure oscillation motion;there are three motions captured in the tests including: ‘‘disk", ‘‘ring" and ‘‘cluster". The pressure drops across the dome under strong pressure oscillation are distinctly divergent from the co.d flow, and the changes of pressure drops are mainly affected by pressure oscillation amplitude, but is less influenced by pressure oscillation motion nor oscillation frequencies. Based on the mass flow co.servation, the reduction of effective flow area of co.bustor under strong pressure oscillation is demonstrated. Liner wall temperatures are analyzed through Multiple Linear Regression(MLR)method to estimate the reduction of the air mass flow proportion of the liner co.ling under strong pressure oscillation. Finally, the air mass flow proportions of each co.ponent under strong pressure oscillation are estimated, the results show that the pressure oscillation motion also has influence on air mass flow proportion.

关键词： Aerodynamic Aero-engine co.bustor Multiple Linear Regression Nonlinear Phase trajectory reco.struction Pressure oscillation

Large-eddy simulation and linear aco.stic modeling of entropy mode oscillations in a model co.bustor with co.lant injection

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Chinese Journal of Aeronautics 2018年第8期31卷 1691-1702页

作者： Man ZHANG An LIANG aecc commercial Aireraft engine co. LTD Shanghai 200241 China

Lean-burn co.bustor is particularly susceptible to co.bustion instability and the unsteady heat release is usually co.sidered as the excitation of the self-maintained thermoaco.stic oscillations. The transverse co.lant injection is widely used to reduce the temperature of burnt gas, but on the other hand, it will introduce temperature fluctuation inside the ***, it is necessary to co.sider the influence of the co.lant injection on co.bustion instability, and evaluate its dynamic feature. In this paper, Large-Eddy Simulation（LES） of the self-excited pressure oscillations in a model co.bustor with co.lant injection is carried out. The analysis of transient flow characteristics and the identification of the pressure modes co.firm that one of the low frequency pressure oscillations is related to entropy fluctuations, which is known as rumble co.bustion instability. The LES results show that transient co.lant injection is another excitation of temperature fluctuation other than unsteady co.bustion. The amplitude of the entropy mode oscillation increases with increasing co.lant air mass whereas the change of its frequency is insignificant. Acco.ding to the major feature of entropy wave oscillation caused by co.lant injection, a co.pact co.lant injection model is proposed and applied in the One Dimensional（1 D） Aco.stic Network Method（ANM）. Key co.relations used in the model match well with LES data in low frequency range. This means that the co.lant injection model is a co.plex one reflecting the interaction of the fluctuating co.lant mass, pressure and temperature. Finally, the co.bustion instability frequencies and modes predicted by aco.stic network method are also in good agreement with LES results.

关键词： Aco.stic wave co.bustion instabilityco.lant injection Entropy LES Network method Rumble Self-excited

A brief introduction to the selective laser melting of Ti6Al4V powders by supreme-speed plasma rotating electrode process

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Progress in Natural Science:Materials International 2020年第1期30卷 94-99页

作者： Yang Liu Xiaohao Zhao Yunjin Lai Qingxiang Wang Liming Lei Shujin Liang Sino-Euro Materials Technologies of Xi'an co. Ltd. aecc commercial aircraft engine co. Ltd.

In the present study,Ti6A14V spherical powders were prepared by supreme-speed plasma rotating electrode process and the particle size fit log-normal *** average diameter of the powders was successfully determined by a model developed in this work,suggesting that the particle size distribution is mainly affected by the rotating *** log-normal distribution factor of the particle size distribution maintains stable as the rotating speed ω *** particle size distribution indicates that the main atomization mode of Ti6Al4V under supreme-speed plasma rotating electrode process is of the characteristics of direct drop *** mechanical properties of the samples prepared by selective laser melting of Ti6A14V powders were characterized,indicating that such Ti6Al4V samples with isotropy structure exhibit high yield strength and good ductility.

关键词： Particle size distribution Atomization Ti6Al4V Plasma rotating electrode process Selective laser melting Rapid solidification

Deformation characterization method of typical double-walled turbine blade structure during casting process

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Journal of Iron and Steel Research International 2023年第10期30卷 2010-2020页

作者： Yi-wei Dong Peng-fei Shao Xiang Guo Bo Xu Chun-ping Yin Zhi-yong Tan School of Aerospace engineering Xiamen UniversityXiamen 361005FujianChina aecc commercial aircraft engine co. Ltd.Shanghai 200241China

To address the co.plex structures,large out-of-tolerance issues,and inco.sistent quality of double-walled turbine blades,a mapping relationship between the structure and deformation was established based on a structural co.relation *** simulations and pouring experiments were carried out based on the designed double-walled model,and a reliable displacement field model of the double-walled blade was established.A deco.pling method for the displacement field of the double-walled blade castings was proposed,which deco.pled the displacement field into bending,torsion,and expansion/shrinkage deformation *** on the displacement field analysis of the theoretical and physical models,an expansion/shrinkage model of double-walled blade structure castings was ***,an experiment to determine the mapping relationship between double-walled co.struction and deformation was designed,which included the characteristic distribution distance and designed angle as structural *** functional relationship between the deformation and the structural parameters was established based on a nonlinear regression method.

关键词： Turbine blade Double-walled structure Deformation deco.pling Expansion/shrinkage model Structure-deformation mapping

Influence of the Aco.stic Liner in Large Eddy Simulation of Longitudinal Thermoaco.stic Instability in a Model Annular co.bustor

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Journal of Thermal Science 2024年第2期33卷 710-724页

作者： MENG Sheng ZHANG Man GAO Yi aecc commercial aircraft engine co. Ltd.Shanghai200241China School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai200240China

Although extensive efforts have been made to dampen the thermoaco.stic instability,successfully co.trolling the pressure oscillations in modern gas turbines or aeroengines remains *** influence of the aco.stic liner on the longitudinal thermoaco.stic mode in a model annular co.bustor is investigated by Large Eddy Simulation(LES) in this *** result of the self-excited longitudinal thermoaco.stic instability without the liner agrees well with the frequency and aco.stic analysis of the pressure mode based on experimental *** different bias flow velocities of the liner located downstream of the co.bustor are then *** results reveal that the existence of the liner influences not only the aco.stic field but also the flow *** the bias velocity is large,it leads to intense turbulence-induced fluctuations,and the pressure oscillation is modulated *** shows that the weak co.pling between flow and pressure oscillations plays a significant role in the onset of the intermittency of a thermoaco.stic *** on the dynamic analysis of the thermoaco.stic system with the aco.stic liner,this intermittency is caused by the influence of the flow field on the flame-aco.stic ***,a low-order modeling method based on Van der Pol(VdP) oscillator with additive stochastic forcing is co.ducted to reproduce the evolving dynamics of the thermoaco.stic *** the numerical cases demonstrated in this work are relatively simpler than those in a practical co.bustion system,the results are helpful for us to understand the effect of the aco.stic liner and show the attractive potential to apply this device to suppress thermoaco.stic instability.

关键词： thermoaco.stic instability aco.stic liner Large Eddy Simulation low-order modeling

Statistical characteristics of spray autoignition of transient kerosene jet in cross flow

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Chinese Journal of Aeronautics 2021年第12期34卷 73-84页

作者： Chi ZHANG Chunlong HE Xin XUE Yuzhen LIN Jibao LI Chongchong LIU National Key Laboratory of Science and Technology on Aero-engine Aero-thermodynamics Research Institute of Aero-EngineBeihang UniversityBeijing 100083China aecc commercial aircraft engine co. Ltd.Shanghai 200241China

To study statistical characteristics of the random spray autoignition,aviation kerosene was injected transiently into non-vitiated air crossflow in a flow reactor with optical *** operating co.ditions were relevant to gas turbine co.bustor:the air crossflow pressure and temperature were in the range of 1.4-1.7 MPa and 830-947 K,respectively,and the jet-tocrossflow momentum flux ratios were 20,50 and *** distributions of random ignition delay times with adequate co.vergence were estimated based on *** dependences of the distributions on reactor pressure,temperature,and jet-to-crossflow momentum flux ratio were *** results show that the resulting distributions appear more co.centrated with the increase of air temperature or jet-to-crossflow momentum flux *** then the co.relations for the mean and standard deviation of the ignition delay time sample data were developed based on the present *** with the co.relations of ignition delay time of homogeneous premixed gas-phase kerosene/air mixture reported in the literature,the results show a greater significance pressure dependence and lower temperature sensitivity of the ignition delay time of nonpremixed kerosene spray.

关键词： Crossflow Flow reactor Ignition delay time Probability density Spray autoignition Transient injection

Influence of grain size on the small fatigue crack initiation and propagation behaviors of a nickel-based superalloy at 650℃

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Journal of Materials Science & Technology 2019年第8期35卷 1607-1617页

作者： Xumin Zhu co.gyang Gong Yun-Fei Jia Runzi Wang Chengcheng Zhang Yao Fu Shan-Tung Tu Xian-Cheng Zhang Key Laboratory of Pressure Systems and Safety Ministry of Education School of Mechanical and Power Engineering East China University of Science and Technology Shanghai 200237 China aecc commercial aircraft engine co. LTD Shanghai Engineering Research Center for Commercial Aircraft Engine Shanghai 201108 China

GH4169 at 650℃ in atmosphere was investigated by using single edge notch tensile specimens. The number of main cracks and crack initiation mechanisms at the notch surface strongly depended on the grain size. The crack initiation life acco.nted for more percentages of the total fatigue life for the alloy with smaller grain size. The fatigue life generally increased with increasing crack initiation life. The small crack transited to long crack when its length reached 10 times the grain size.

关键词： Fatigue crack initiation Small crack Crack growth rate Grain size effect High temperature

Two-sided ultrasonic surface rolling process of aeroengine blades based on on-machine nonco.tact measurement

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Frontiers of Mechanical engineering 2020年第2期15卷 240-255页

作者： Shulei YAO Xian CAO Shuang LIU co.gyang GONG Kaiming ZHANG Chengcheng ZHANG Xiancheng ZHANG Key Laboratory of Pressure Systems and Safety(Ministry of Education) East China University of Science and TechnologyShanghai 200237China aecc commercial aircraft engine co. Ltd.Shanghai Engineering Research Center for Commercial Aircraft EngineShanghai 201108China

As crucial parts of an aeroengine,blades are vulnerable to damage from long-term operation in harsh *** ultrasonic surface rolling process(USRP)is a novel surface treatment technique that can highly improve the mechanical behavior of *** seco.dary machining,the nominal blade model cannot be used for seco.dary machining path generation due to the deviation between the actual and nominal *** clamping error of the blade also affects the precision of seco.dary *** study presents a two-sided USRP(TS-USRP)machining for aeroengine blades on the basis of on-machine nonco.tact ***,a TS-USRP machining system for blade is ***,a 3D scanning system is used to obtain the point cloud of the blade,and a series of point cloud processing steps is performed.A local point cloud automatic extraction algorithm is introduced to extract the point cloud of the strengthened region of the ***,the tool path is designed on the basis of the extracted point ***,an experiment is co.ducted on an actual blade,with results showing that the proposed method is effective and efficient.

关键词： aeroengine blades on-machine nonco.tact measurement point cloud processing path planning surface strengthening

Dynamic analysis of C/C co.posite finger seal

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Chinese Journal of Aeronautics 2014年第3期27卷 745-758页

作者： Chen Guoding Wang Li’na Yu Qiangpeng Su Hua School of Mechanical engineering Northwestern Polytechnical University AVIC commercial aircraft engine co. Ltd

A seal device as an important co.ponent of aeroengines has decisive influence on per- formance, reliability, and working life of aeroengines. With the development of aeroengines, demands on the performance characteristics of seal devices are made strictly. Finger seal as a novel kind of sealing device, recently attracts more and more attentions in academic circles and engineer- ing fields at home and abroad. Research on finger seals has been extensively developed, especially on leakage and wear performances under dynamic co.ditions. However, it is a pity that the work on finger seals has been limited with a single approach that is improving the performance by structural optimization; in addition, the technology of dynamic analysis on finger seals is weak. Aiming at the problems mentioned above, a distributed mass equivalent dynamic model of finger seals co.sidering the co.pling effect of overlaid laminates is established in the present paper, the dynamic perfor- mance of 2.5 dimension C/C co.posite finger seal is analyzed with the model, and then the effects of fiber bundle density and fiber bundle preparation direction on finger seal＇s dynamic performance are discussed, as well as co.pared with those of co.based alloy finger seal. The current work is about dynamic analysis of finger seals and application of C/C co.posite in this paper may have much academic significance and many engineering values for improving research level of finger seal dynamics and exploring feasibility of C/C co.posite being used for finger seals.

关键词： Aeroengine C/C co.posite co.based alloy Equivalent dynamic model Finger seal