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SSRN 2024年

作者： Sha, Yundong Zhao, Wenqiang Tang, Xiaoning Zhao, Fengtong Liaoning Province Key Laboratory of Advanced Measurement And Test Technology of Aviation Propulsion Systems Shenyang Aerospace University Shenyang110136 China

Thin-walled connection structures are commonly used in the hot-end components of aerospace vehicles. Large deflection nonlinear responses and fatigue failure occur due to their discontinuous mass distribution and prominent cross-sectional changes under the action of complex thermal, aerodynamic, and noise loads. A thermoacoustic fatigue test was carried out to obtain the acoustic and vibration responses and fatigue life changes of the connection structure under heat flow conditions in engineering applications. The high-temperature acoustic fatigue test system of aviation thin-walled structures was used, taking the high-temperature alloy thin-walled plate-load-bearing frame bolted connection structure as the research object. As a result, the vibration response and fatigue life under different thermoacoustic loads were obtained. The contact finite element method was used to simulate the connection pretightening force, and the coupled finite element/boundary element method was used to calculate the acoustic and vibration response of heat flow conditions. The changing rules of the frequency response peak value at the critical point of the thin-walled connection structure under the effects of different temperature fields, fluid fields, and sound fields were obtained through the processing and analysis of the calculation results. Considering the structural vibration fatigue damage mechanism, this study employed an improved rainflow counting method to compute the rainflow circulation matrix (RFM) and rainflow damage matrix (RFD) of the vibration stress time history at critical points within the structure framework. Said method was combined with Miner's linear cumulative damage theory to estimate the fatigue life under various thermal-fluid-acoustic coupled loads. A comprehensive analysis validates the accuracy of the established numerical simulation calculation model in identifying critical connection points within structures subjected to pre-tightening forces. This model

关键词： Heat transfer

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Numerical Study of the Cooling Performance of Rupert-Shaped Film Cooling Holes

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SSRN 2023年

作者： Wang, Jianming Wang, Wenzong Li, Guangchao Luo, Die Wu, Junqiang Liaoning Key Lab of Advanced Measurement and Test Technology for Aviation Propulsion System School of Aero-engine Shenyang Aerospace University Shenyang110136 China China Aerodynamics Research and Development Center Mianyang621000 China

This study presents a novel film-cooling hole structure inspired by "Prince Rupert’s Drops." It performs numerical simulations of a flow field with one cylindrical hole and four different Rupert-shaped film-cooling holes, analyzing the effectiveness of these five film-cooling holes on cooling flat plates. The cooling effectiveness of the Rupert-shaped film-cooling holes significantly outperform that of the cylindrical hole at three blowing ratios. The maximum increase in the area-weighted average cooling effectiveness of the Rupert-shaped holes is over 9 times greater than that of the cylindrical hole. The flow structures of the five holes were compared and analyzed, and the effectiveness of the Rupert-shaped film holes in weakening the kidney-shaped vortex generated by the coolant was confirmed. Furthermore, the Rupert-shaped holes improve the attachment of the film to the wall surface. Further analysis indicates that the shape of the Rupert-shaped holes is crucial for enhancing their cooling effectiveness. © 2023, The Authors. All rights reserved.

关键词： Film cooling

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Experimental and Kinetic Modeling Study on the Oxidation and Laminar Combustion Characteristics of Natural Gas

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SSRN 2023年

作者： Chen, Xiaoxiao Zeng, Wen Zheng, Weilin Hu, Erjiang Ma, Hongyu Liaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System Shenyang Aerospace University Liaoning Shenyang110136 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shanxi Xi'An710049 China AECC Shenyang Engine Research Institute Shenyang110015 China

The oxidation process in the flow tube reactor at the conditions of P=0.1 MPa, T=500-1850 K, f=0.5, 1.0, 3.5, and the laminar combustion process in the constant volume combustion bomb at the conditions of P=0.1, 0.2, 0.3 MPa, T=300, 350, 400 K, f= 0.7-1.4, the O2 contents of 15%, 18% and 21%, the CO2 and H2O contents of 0%, 10%, and 20% of natural gas (0.9 methane/0.07 ethane/0.03 propane, mole fraction) were experimental tested. In the oxidation process of natural gas, with the equivalence ratio increasing, the starting and ending temperatures for oxidation reaction of natural gas are increased, the reaction temperatures corresponding to CO generation and consumption are higher, and the amount of NO production is decreased. In the the laminar combustion process of natural gas, at the conditions of higher pressure, equivalence ratio, CO2 and H2O contents, the flame front is not smooth as a large number of cracks and cell structures appear, and the flame is unstable. Moreover, with the initial temperature and oxygen content increasing or the initial pressure, CO2 and H2O contents decreasing, the laminar flame speed is increased. Furthermore, combined the path sensitivity analysis, rate of production analysis, reaction path analysis and the decoupling method, a reduced reaction mechanism (including 40 species and 189 reactions) of natural gas was developed. Through comparing with the calculated results by the Aramco 2.0 mechanism and the corresponding test data, the reduced reaction mechanism can well predict the oxidation, ignition delay and laminar combustion characteristics of natural gas under various conditions. © 2023, The Authors. All rights reserved.

关键词： Sensitivity analysis

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Effect of Equivalence Ratio on Particle Variation of CH4/Air Mixture of Coaxial Dielectric Barrier Discharge

Effect of Equivalence Ratio on Particle Variation of CH4/Air...

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2016 4th International Conference on Machinery,Materials and Information technology Applications(ICMMITA 2016)

作者： CHEN Lei FENG Chao LONG Wuqiang SONG Peng WU Qianqian Institute of Internal Combustion Engine Dalian University of Technology Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System Shenyang Aerospace University College of Mechanical and Electronic Engineering Dalian Nationalities University

The effect of equivalence ratio on particle components of dielectric barrier discharge of CH/air mixture were carried out by employing a coaxial cylindrical electrode. The result shows that molar fraction of active particles such as H, O, CH and NO decrease slightly with the equivalence ratio, however, enough active particles could be obtained even at the smallest equivalence ratio conditions;no obvious change in the electron density with the equivalence ratio has been obtained, which has a very beneficial effect on the methane-air combustion reaction under the conditions of low equivalence ratio.

关键词： Dielectric barrier discharge Non equilibrium plasma Active particles Equivalence ratio

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Characteristic of Electron Density of Coaxial Dielectric Barrier Discharge of CH4/Air Mixture

Characteristic of Electron Density of Coaxial Dielectric Bar...

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2016 4th International Conference on Machinery,Materials and Information technology Applications(ICMMITA 2016)

Numerical study of dielectric barrier discharge of CH4/air mixture were carried out by employing a coaxial cylindrical electrode with diameter of 10 mm under the condition of the discharge voltage of 6000 V. The influence of electrode structure parameter and equivalence ratio on electron density were analyzed. The result shows that the electron density which increases with the decrease of the distance from the cathode has a quick increase at the small position near the cathode(0.05～0.4mm), and the maximum value of electron density appears at the position of 0.1mm. The electron density has no obvious change with the equivalence ratio, it is benefit to the lean combustion of natural gas application.

关键词： Non-equilibrium plasma Dielectric barrier discharge Electron density

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A New Reduced Reaction Mechanism of the Surrogate Fuel for RP-3 Kerosene

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SSRN 2022年

作者： Liu, Jing Hu, Erjiang Zheng, Weilin Zeng, Wen Chang, Yachao State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shangxi Xi’an710049 China Liaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System Shenyang Aerospace University Liaoning Shenyang110136 China Key Laboratory of Ocean Energy Utilization and Energy Conservation Ministry of Education Dalian University of Technology Dalian116024 China

By combining the reaction class-based global sensitivity analysis (RC-GSA) methodology, species sensitivity analysis (SSA) methodology, decoupling method and genetic algorithm (GA), a reduced reaction mechanism of the surrogate fuel (10% n-dodecane/14% n-decane/30% iso-hexadecane/36% methylcyclohexane/10% toluene, in mole fraction) for RP-3 kerosene was constructed. As an example, the detailed construction process of skeleton mechanism of methylcyclohexane (MCH) was presented, and the skeleton mechanism constructions of other components in the surrogate fuel were similar to that of MCH. First, the dominant reaction classes in the fuel-relevant mechanism of MCH were recognized by the RC-GSA, the representative species in each retained reaction classes were selected by the SSA, and the skeleton fuel-relevant mechanism of MCH was developed. Second, through combining the skeleton fuel-relevant mechanism of MCH with the reduced reaction mechanism of C 0 -C 3 by the decoupling method, the initial skeleton mechanism of MCH was obtained. Third, based on the GA, the rate constants of fuel-relevant reactions in the initial skeleton mechanism of MCH were optimized to enhance the prediction performance. Finally, by coupling the skeleton reaction mechanisms of n-dodecane, n-decane, toluene, iso-hexadecane, MCH, and the reduced reaction mechanism of C 0 -C 3 , a reduced mechanism (containing 121 species and 469 reactions) of the surrogate fuel for RP-3 kerosene was formed. The predicted main species concentrations during the oxidation process in the jet-stirred reactor, the ignition delay times in the shock tube and laminar flame speeds in the constant volume bomb by this reduced mechanism are in good agreement with the corresponding experimental data of RP-3 kerosene. © 2022, The Authors. All rights reserved.

关键词： Sensitivity analysis

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Influence of laminate scheme on design of continuous fiber reinforced composite turbofan engine shaft

Influence of laminate scheme on design of continuous fiber r...

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2014 International Conference on Vehicle,Mechanical and Electrical Engineering(ICVMEE 2014)

作者： Yundong Sha Queyue Jia Li Luo Fengtong Zhao Xiaochi Luan Shenyang Aerospace University Liaoning Key Laboratory of Advanced for Aeronautical Propulsion Test Technology System

advanced materials and processes are required to meet the performance goals in the design of advanced turbofan engine,SiC/Ti composite is typically used in low pressure turbine shaft(LPTS).Firstly,establish the viability and effectiveness of composite cylinder assemblage(CCA)micro-mechanics model and representative volume element(RVE) micro-mechanics model which are utilized to calculate the mechanical parameter of continuous fiber reinforced metal matrix composite(CFRMMC),*** show that RVE model is more applicable to calculate continuous fiber reinforced ***,parameters of mechanics performance calculated by RVE model are taken as input to build mechanics analysis model of fiber reinforced metal matrix composite shaft *** optimal solution will be got by design and analysis of CFRMMC shaft structure with 2 kinds of *** with deformation and stress of shaft structure with different material scheme,then an optimization scheme of SCS/Ti2 AlNb composite of LPTS can be obtained.

关键词： CFRMMC RVE LPTS Deformation and stress Laminate scheme

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Influence Factors of Frictional Heat between Bristles and Rotor for a Multi-Stage Brush Seal

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SSRN 2024年

作者： Sun, Dan Yang, Yixiao Zhao, Huan Zhang, Jieyi Yang, Zemin Zhang, Jinghan Key Laboratory of Turbomachinery Advanced Seal Technology Shenyang Shenyang Aerospace University Shenyang110136 China Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System Shenyang Aerospace University Shenyang110136 China Key Laboratory for Power Transmission of Aero Engine Aero Engine Corporation of China Shenyang110115 China

In multi-stage brush seals (MBS), frictional heat generates at frictional surface, which leads to early failure of the seal The frictional heat was accumulated at the downstream stages caused by transfer of the heat from upstream stage to downstream one with flow of the airflow. A three-dimensional tube bundle model of the MBS was established to study change of heat flux on the frictional heat between bristles and rotor among stages. Increasing height of backing plate to rotor could not only balance the pressure drops but also reduce the bristle temperature at downstream stage. decreasing interference amount and decreasing axial width of bristle pack stage by stage, which had a higher impact on bristle temperature at downstage stages. © 2024, The Authors. All rights reserved.

关键词： Heat flux

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Study on the Sealing Characteristics of Casing Flange Considering the Influence of Surface Roughness Based on Equivalent Gap Theory

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SSRN 2024年

作者： Ai, Yanting Han, Shiruo Zhao, Dan Tian, Jing Liu, Junnan Liu, Yu Yao, Yudong Zhang, Yuhang Shenyang Aerospace University Key Lab of Advanced Measurement and Test Technology for Aviation Propulsion System Liaoning Province China Aero Engine Corporation of China Sichuan Gas Turbine Research Institute Sichuan Province Chengdu China Northwestern Polytechnical University School of Power and Energy China

The study establishes the Equivalent Gap Theory (EGT) by analyzing the relationship between microscopic rough contact surfaces and smooth contact surfaces. Then a Quantitative Leakage Volume Prediction (QLVP) method based on EGT is proposed. Subsequently, the approach is employed to investigate the impact of geometric parameters, machining and assembly conditions, as well as loading conditions on sealing performance of the casing flange. The findings demonstrate that the QLVP method exhibits a deviation of merely 6.29% when compared with experimental results. Moreover, the number of bolts, surface roughness, and internal gas pressure each exert a notable influence on the volume of leakage. The study offers an effective approach for the design and leakage assessment of casing flange sealing in aircraft engines. © 2024, The Authors. All rights reserved.

关键词： Flanges

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Corrigendum to “Simulation method and spectrum modulation characteristic analysis of typical fault signals of inter-shaft bearing” [Mech. Syst. Signal Process. 209 (2024) 111145/YMSSP_111145]

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Mechanical systems and Signal Processing 2024年 214卷

作者： Cai Wang Jing Tian Feng-ling Zhang Yan-ting Ai Zhi Wang Ren-zhen Chen Liaoning Key Laboratory of Advanced Test Technology for Aeronautical Propulsion System Shenyang Aerospace University Shenyang 113006 China

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