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Time-dependent Vibration Frequency Reliability Analysis of Blade Vibration of Compressor Wheel of Turbocharger for Vehicle Application

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Chinese Journal of Mechanical engineering 2014年第1期27卷 205-210页

作者： WANG Zheng WANG Zengquan ZHUANG Li WANG A-na Science and Technology on Diesel Engine Turbocharging Laboratory China North Engine Research Institute Center of Engine Test and Measurement China North Engine Research Institute

Blade vibration failure is one of the main failure modes of compressor wheel of turbocharger for vehicle application. The existing models for evaluating the reliability of blade vibration of compressor wheel are static, and can not reflect the relationship between the reliability of compressor wheel with blade vibration failure mode and the life parameter. For the blade vibration failure mode of compressor wheel of turbocharger, the reliability evaluation method is studied. Taking a compressor wheel of turbocharger for vehicle application as an example, the blade vibration characteristics and how they change with the operating parameters of turbocharger are analyzed. The failure criterion for blade vibration mode of compressor wheel is built with the Campbell diagram, and taking the effect of the dispersity of blade natural vibration frequency and randomness of turbocharger operating speed into account, time-dependent reliability models of compressor wheel with blade vibration failure mode are derived, which embody the parameters of blade natural vibration frequency, turbocharger operating speed, the blade number of compressor wheel, life index and minimum number of resonance, etc. Finally, the rule governing the reliability and failure rate of compressor wheel and the method for determining the reliable life of compressor with blade vibration is presented. A method is proposed to evaluate the reliability of compressor wheel with blade vibration failure mode time-dependently.

关键词： turbocharger compressor wheel blade vibration reliability failure rate reliable life

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Numerical study on the separation and superposition of the influences from up-and downstream rotors

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Journal of Beijing Institute of technology 2014年第4期23卷 469-480页

作者：赵奔杨策胡良军马朝臣张继忠 School of Mechanical Engineering Beijing Institute of Technology Science and Technology on Diesel Engine Turbocharging Laboratory China North Engine Research Institute

A three-dimensional Navier-Stokes solver is used to investigate the separation and superposition of the influences from upstream and downstream rotors in an axial-radial combined compressor for unsteady design applications. The data from rotor/stator and stator/rotor configurations show that the unsteady flow response in axial stator passage is caused only by one rotor. The results from the rotor/stator/rotor configuration revealed the superimposed characteristic of influences from upstream and downstream the rotor. The impact of the superimposed characteristic was studied by analyzing the virtual relative flow angle at the stator exit. The results show that the axial velocity in the passage of axial stator can be influenced by wake from upstream axial rotor and potential field of downstream radial rotor. While they are coupled to have an effect on the unsteady flow in axial statot passage, the excitation or suppression phenomena appear and lead to different levels of deterministic fluctuation kinetic energy. Their locations are determined by the frequencies of the involved influences. In addition, the variability of superimposed characteristic （ excitation and suppression） at the stator exit modulates the inlet flow angle for downstream rotor.

关键词： axial-radial combined compressor separation superposition unsteady flow angle

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Numerical Investigation of the Superimposed Effects on Stator Wake Oscillation in an Axial-radial Combined Compressor

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Journal of Thermal science 2014年第1期23卷 22-35页

作者： ZHAO Ben YANG Ce HU Liangjun ZHOU Mi ZHANG Jizhong School of Mechanical Engineering Beijing Institute of Technology Basic Subject Department Bohai Shipbuilding Vocational College Science and Technology on Diesel Engine Turbocharging Laboratory China North Engine Research Institute

The superimposed influences of the blade rows in a multistage compressor are important because different matches of upstream and downstream blades can result in significant differences in the stator wake oscillation. Numerical investigation of the axial stator wake oscillation, which is affected upstream by the axial rotor and downstream by the radial rotor, was performed in an axial-radial combined compressor. Many configurations with different blade numbers and locations, which influence axial stator wake oscillation were investigated. When rotors have equal blade numbers, the axial stator wake oscillates periodically versus time within time T(moving blade passing 1/3 revolution). In contrast, stator wake oscillates irregularly within T when rotors have different blade numbers. A model-split subtraction method is presented in order to separate the influences of the individual blade rows on the wake oscillation of the axial stator. Analysis from the rotor-stator configuration showed that the unsteady flow angle fluctuation response is caused by the upstream rotor. For the rotor-stator-rotor configuration, the unsteady flow angle fluctuations are influenced by upand downstream blade rows. With the model-split subtraction method, the upand downstream influences on the flow angle fluctuation could be clearly separated and quantified. Low amplitudes could be observed when the influences from upand downstream moving rows were superimposed with the "positive peaknegative peak" type wave. Clocking investigations were carried out to change the relative superimposed phase of influences from the surrounding blade rows in order to modulate the amplitudes of the axial stator wake oscillation. However, the amplitudes did not reach the maximum when they were superimposed with "positive peak-positive peak" type wave due to the impact of the interaction between the two moving blade rows.

关键词： axial-radial combined compressor wake oscillation superimposed effect absolute flow angle clocking

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Research on the connection technology of TiAl alloy turbine in diesel engine turbocharger 6

Research on the connection technology of TiAl alloy turbine ...

引用

6th International Symposium on Fluid Machinery and Fluid engineering, ISFMFE 2014

作者： Wang, Jinwei Wang, Zheng Wang, Xiujuan He, Hong Zhuang, Li Peng, Haiyun Science and Technology on Diesel Engine Turbocharging Laboratory Tianjin China

ISBN: (纸本)9781849199070

Turbine shaft is one of key parts of turbocharger. Nowadays, the most common way to produce turbine shaft is to connect nickel-based high-temperature alloy K418 turbine and 42CrMo steel shaft by friction welding. Because the density of TiAl alloy is less than half of nickel-based high-temperature alloy K418, the weight of turbine made from TiAl can be reduced more than half. Therefore, the transient response can be improved efficiently and some environmental protection problems can be solved at the same time. However, TiAl alloy is a sort of intermetallic compound and it is impossible to connect it with alloy steel shaft by friction welding based on the analysis of material molecule configuration theory. In this paper, three sections connecting method designed for mass production is studied. A high quality and good reliability connection of TiAl turbine and steel shaft is obtained. The goals of easy operation, convenience and high efficiency are achieved.

关键词： Binary alloys

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Numerical analysis of flow interaction of turbine system in two-stage turbocharger of internal combustion engine

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IOP Conference Series: Materials science and engineering 2016年第1期129卷

作者： Y B Liu W L Zhuge Y J Zhang S Y Zhang State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing 100084 China Department of Mechanical Engineering Academy of Armored Force Engineering Beijing 100072 China National Key Laboratory of Diesel Engine Turbocharging Technology Tianjin 037036 China

To reach the goal of energy conservation and emission reduction, high intake pressure is needed to meet the demand of high power density and high EGR rate for internal combustion engine. Present power density of diesel engine has reached 90KW/L and intake pressure ratio needed is over 5. Two-stage turbocharging system is an effective way to realize high compression ratio. Because turbocharging system compression work derives from exhaust gas energy. Efficiency of exhaust gas energy influenced by design and matching of turbine system is important to performance of high supercharging engine. Conventional turbine system is assembled by single-stage turbocharger turbines and turbine matching is based on turbine MAP measured on test rig. Flow between turbine system is assumed uniform and value of outlet physical quantities of turbine are regarded as the same as ambient value. However, there are three-dimension flow field distortion and outlet physical quantities value change which will influence performance of turbine system as were demonstrated by some studies. For engine equipped with two-stage turbocharging system, optimization of turbine system design will increase efficiency of exhaust gas energy and thereby increase engine power density. However flow interaction of turbine system will change flow in turbine and influence turbine performance. To recognize the interaction characteristics between high pressure turbine and low pressure turbine, flow in turbine system is modeled and simulated numerically. The calculation results suggested that static pressure field at inlet to low pressure turbine increases back pressure of high pressure turbine, however efficiency of high pressure turbine changes little; distorted velocity field at outlet to high pressure turbine results in swirl at inlet to low pressure turbine. Clockwise swirl results in large negative angle of attack at inlet to rotor which causes flow loss in turbine impeller passages and decreases turbine efficien

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Research on the connection technology of TiAl alloy turbine in diesel engine turbocharger

Research on the connection technology of TiAl alloy turbine ...

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2014 ISFMFE - 6th International Symposium on Fluid Machinery and Fluid engineering

作者： Jinwei Wang Zheng Wang Xiujuan Wang Hong He Li Zhuang Haiyun Peng Science and Technology on Diesel Engine Turbocharging Laboratory Tianjin China

ISBN: (纸本)9781510804159

关键词： Interference Fit Mechanical Connection Three Sections Connecting Material TiAl Alloy Turbine Turbocharger Turbochargers interference fit turbines turbine shaft COUPLING(MECHANICAL) friction welding superalloys SHAFT

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RETRACTED ARTICLE: Study on the reliability evaluation method for compressor wheel of turbocharger with over-speed failure mode

RETRACTED ARTICLE: Study on the reliability evaluation metho...

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2013 International Conference on Quality, Reliability, Risk, Maintenance, and Safety engineering, QR2MSE 2013

作者： Wang, Zheng Wang, Zengquan Ren, Zhaoxin Zhuang, Li Wang, A-Na National Key Laboratory of Diesel Engine Turbocharging Technology China North Engine Research Institute Tianjin China

ISBN: (纸本)9781479910144

Taking the compressor wheel of turbocharger for vehicle application as an example, to analyze the over-speed failure mode of compressor wheel of turbocharger, the uncertainty characteristics of stress and strength is studied. Taking the effect of structural characteristics, the randomness of stress and the dispersity of strength into account, the time-dependent reliability model of compressor wheel with over-speed failure mode is derived, which can embody the parameters of the number of symmetrical units, stress, strength and life index. Then, the reliability and failure rate of compressor wheel with over-speed failure mode are studied, and the method for determining the reliable life of compressor wheel is developed. © 2013 IEEE.

关键词： Safety engineering

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Reliability-based fatigue life prediction method for compressor wheel rub of turbocharger for vehicle application

Reliability-based fatigue life prediction method for compres...

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13th International Conference on Fracture 2013, ICF 2013

作者： Wang, Zheng Wang, Zeng-Quan Xing, Weidong Wang, A-Na National Key Laboratory of Diesel Engine Turbocharging Technology China North Engine Research Institute Tianjin 022 China Center of Engine Test and Measurement China North Engine Research Institute Tianjin 022 China

ISBN: (纸本)9781629933696

The fatigue failure of compressor wheel rub is one of important failure modes of turbocharger for vehicle application. Because the operating state of turbocharger in the life cycle changes as the work condition of diesel engine changes, the compressor wheel rub of turbocharger is applied by the variable stress which can causes the fatigue failure. In this paper, the effect of centrifugal load, thermal load and aerodynamic load on the stress of compressor wheel rub is studied, and then the fatigue stress spectrum of compressor wheel rub is developed based on the endurance test profile of vehicle engine. In order to research the fatigue strength of compressor wheel rub, the fatigue specimen is designed and the relationship between the stress and fatigue life of compressor wheel rub is built. Then, utilizing the linear Miner cumulative damage rule and the first-order reliability method, the reliability model of compressor wheel rub with fatigue failure mode is derived, and the rule that the reliability of compressor wheel rub changes with life is studied. Based on the reliability model of compressor wheel rub with fatigue failure mode developed, the method for determining the reliable fatigue life of compressor rub of turbocharger is proposed. The result shows that with the method developed in this paper the fatigue life of compressor wheel rub for the given reliability can be predicted reasonably, and the reliability of compressor wheel rub can also be calculated for the given fatigue life. Copyright © (2013) by International Conference on Fracture.

关键词： Fatigue damage

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Study of mechanism of counter-rotating turbine increasing two-stage turbine system efficiency

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International Journal of Fluid Machinery and Systems 2013年第3期6卷 160-169页

作者： Liu, Yanbin Zhuge, Weilin Zheng, Xinqian Zhang, Yangjun Zhang, Shuyong Zhang, Junyue The State Key Laboratory of Automotive Safety and Energy Conservation Tsinghua University Beijing 100084 China National Key Laboratory of Diesel Engine Turbocharging Technology Datong Shanxi 037036 China Department of Mechanical engineering Academy of Armed Force Engineering Beijing 100072 China

Two-stage turbocharging is an important way to raise engine power density, to realize energy saving and emission reducing. At present, turbine matching of two- stage turbocharger is based on MAP of turbine. The matching method does not take the effect of turbines' interaction into consideration, assuming that flow at high pressure turbine outlet and low pressure turbine inlet is uniform. Actually, there is swirl flow at outlet of high pressure turbine, and the swirl flow will influence performance of low pressure turbine which influencing performance of engine further. Three-dimension models of turbines with two-stage turbocharger were built in this paper. Based on the turbine models, mechanism of swirl flow at high pressure turbine outlet influencing low pressure turbine performance was studied and a two-stage radial counter-rotation turbine system was raised. Mechanisms of the influence of counter-rotation turbine system acting on low-pressure turbine were studied using simulation method. The research result proved that in condition of small turbine flow rate corresponding to engine low-speed working condition, counter-rotation turbine system can effectively decrease the influence of swirl flow at high pressure turbine outlet imposing on low pressure turbine and increases efficiency of the low-pressure turbine, furthermore increases the low-speed performance of the engine.

关键词： Rotation

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Notice of Retraction: Study on the reliability evaluation method for compressor wheel of turbocharger with over-speed failure mode

Notice of Retraction: Study on the reliability evaluation me...

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International Conference on Quality, Reliability, Risk, Maintenance, and Safety engineering (ICQR2MSE)

作者： Zheng Wang Zengquan Wang Zhaoxin Ren Li Zhuang A-Na Wang National Key Laboratory of Diesel Engine Turbocharging Technology China North Engine Research Institute Tianjin China

This article has been retracted by the publisher.

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