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

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 ...

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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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Cross-domain fault diagnosis of marine diesel engines based on stepwise diffusion and iterative bidirectional optimization

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engineering Applications of Artificial Intelligence 2025年 155卷

作者： Zhao, Zhen Jin, Ziru Xin, Xin Fu, Yutong Huang, Xiaotong Li, Liang Qin, Hongyan Wei, Chong Li, Yongwei Liu, Yang School of Information Science and Technology Qingdao University of Science and Technology Qingdao266061 China CAS Key Laboratory of Behavioral Science Institute of Psychology Chinese Academy of Sciences Beijing100089 China Shandong Lukong Electric Power Equipment Co. Ltd. Dezhou253200 China Qingdao Zichai Boyang Diesel Engine Co. Ltd. Qingdao266701 China China Classification Society Beijing100006 China

Cross-domain fault diagnosis of marine diesel engines presents significant challenges due to variations in data distribution and the limited availability of labeled fault samples under different operating conditions. To address this, an unsupervised domain-adaptive diagnostic framework is proposed, integrating stepwise diffusion and iterative bidirectional optimization to enhance fault identification. First, the quadratic axial attention transformer introduces a fourth weight in the axial computation to effectively capture the long-range spatio-temporal correlations in the time–frequency representations and strengthen the cross-axis contextual dependence. Next, the domain stepwise diffusion bridge utilizes Markov transform to gradually refine the significant distributional differences across domains into continuous sub-distributions, ensuring a smoother adaptation process. Finally, an iterative bidirectional optimization strategy is proposed to dynamically coordinate the interaction between stepwise diffusion and fault classification, where two complementary learning directions are alternately executed to preserve the semantic integrity of features. Experimental validation on a self-constructed dataset covering multiple operating conditions demonstrates the effectiveness of the proposed approach, achieving 93.80% average accuracy, 93.75% precision, and 93.45% recall. This approach not only breaks through the limitations of existing domain alignment methods and provides a brand new solution for cross-domain fault diagnosis, but also provides a wide range of implications for future research and applications in this field. The code and model are available at: https://***/lazyJzr/UDAtask. © 2025 Elsevier Ltd

关键词： Markov processes

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Reliability evaluation method for turbocharger turbine with overspeed failure mode

Reliability evaluation method for turbocharger turbine with ...

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International Conference on Reliability, Maintainability and Safety

作者： Wang, Zheng Wang, A-Na Guo, Kai Meng, Rixiu Science and Technology on Diesel Engine Turbocharging Laboratory China North Engine Research Institute Datong China

ISBN: (纸本)9781612846644

For the turbine with failure mode of overspeed, the effect of the number of blades and load application on the reliability of turbine is studied, and the reliability and failure rate models of turbocharger turbine under ultimate load are developed. First, the structural characteristic of turbine is analyzed, and the probability distribution function of strength of turbine capable of reflecting the effect of the number of blades, is derived. For the failure mode caused by the ultimate load of overspeed, the models of reliability and failure rate of turbine are developed, respectively, which can embody the effect of the number of blades, load, strength and the operating cycles. Taking a turbocharger as an example, the behavior of the reliability and failure rate of turbine changing as the number of operating cycles is studied. The results show that as the number of operating cycle increases, the reliability of turbine decreases and the failure rate also decreases. The models proposed in this paper can be applied to analyze and evaluate the reliability of turbine more scientifically. © 2011 IEEE.

关键词： Turbomachine blades

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Characterization of Swirling Inflow Effects on Turbine Performance under Pulsating Flows

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Journal of Thermal science 2022年第5期31卷 1734-1744页

作者： DING Zhanming WANG Cuicui ZHANG Junyue LIU Ying HOU Linlin ZHUGE Weilin ZHANG Yangjun Science and Technology on Diesel Engine Turbocharging Laboratory China North Engine Research InstituteTianjin300400China Kangyue Technology(Shandong)Co. LtdShouguangShandong262718China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing100084China

The present study focuses on the influence of the swirling flows on flow behaviors and performance of a radial-flow turbocharger turbine under pulsating inflow *** characterize the effects of swirling flow,three sets of simulations of the turbine were carried out,which are an unsteady simulation under pulsating swirling inflow,an unsteady simulation under equivalent pulsating uniform inflow,and quasi-steady simulations under uniform *** proved that swirling flow has a considerable negative influence on turbine instantaneous performance and lead to 2.5%cycle-averaged efficiency reduction under pulsating flow *** inflow would lead to significant losses in both the volute and the rotor,while the pulsating inflow leads to higher losses in the rotor and shows little influence on the losses in the *** instantaneous efficiency reduction of the turbine could be correlated with the time-varying inlet swirl *** the influence of unsteady inlet swirls,the volute flow field is highly distorted and the free vortex relation is no longer *** swirling flow has strong interactions with the wake flow of the volute tongue,leading to additional *** flow angle at rotor inlet is remarkably reduced and its distribution is significantly *** separation flows and passage vortices would appear in the rotor because of the swirling inflow,leading to inferior rotor performance.

关键词： swirling inflow pulsating flow CFD turbocharger turbine internal combustion engine

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Investigation of flow structure in a turbocharger turbine under pulsating flow conditions

Investigation of flow structure in a turbocharger turbine un...

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2008 SAE International Powertrains, Fuels and Lubricants Congress

作者： Chen, Li Zhuge, Weilin Zhang, Yangjun Li, Yazhuo Zhang, Shuyong Tsinghua University China National Key Laboratory of Diesel Engine Turbocharging Technology

A three-dimensional numerical investigation into aerodynamic feature of the turbocharger turbine under pulsating flow conditions is conducted in this paper. Dual time stepping approach is applied to solve the unsteady Navier-Stokes equations, while the Jameson central scheme is brought in for spatial discretization, and Spalart-Allmaras turbulence model is employed in order to get good viscous resolution, accuracy and computing efficiency. The quasi-steady and unsteady performance of the turbine is given and compared. Five blade passage cross sections are chosen to analyze the structure of the secondary flow at 4 key instants. The developments of different vortex, especially the tip leakage vortex, passage vortex are discussed. The results have shown that the unsteady performance deviates substantially from quasi-steady performance, and the secondary flow structure varies tremendously under the pulsating flow conditions. © 2008 SAE International.

关键词： Navier Stokes equations

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Investigation on Centrifugal Impeller in an Axial-radial Combined Compressor with Inlet Distortion

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Journal of Thermal science 2011年第6期20卷 486-494页

作者： Du Li Ce Yang Ben Zhao Mi Zhou Mingxu Qi Jizhong Zhang School of Mechanical Engineering Beijing Institute of Technology Beijing China Basic Subject Department Bohai Shipbuilding Vocational College Huludao China National Key Laboratory of Diesel Engine Turbocharging Technology Datong China

Assembling an axial rotor and a stator at centrifugal compressor upstream to build an axial-radial combined compressor could achieve high pressure ratio and efficiency by appropriate size *** upstream potential flow and wake effect appear at centrifugal impeller *** this paper,the axial-radial compressor is unsteadily simulated by three-dimensional Reynolds averaged Navier-Stokes equations with uniform and circumferential distorted total pressure inlet condition to investigate upstream effect on radial *** results show that spanwise nonuniform total pressure distribution is generated and radial and circumferential combined distortion is formed at centrifugal rotor *** upstream stator wake deflects to rotor rotation direction and decreases with blade span *** distortion causes different separated flow formations at different pitch *** tip leakage vortex is suppressed in centrifugal blade *** distorted inlet condition,flow direction of centrifugal impeller leading edge upstream varies evidently near hub and shroud but varies slightly at *** addition,compressor stage inlet distortion produces remarkable effect on blade loading of centrifugal blade both along chordwise and pitchwise.

关键词： axial-radial combined compressor centrifugal impeller wake inlet distortion

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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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Investigation of high-tumble chamber of ammonia-hydrogen fueled elliptical rotary engine based on turbulence and combustion characteristics

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Fuel 2025年 400卷

作者： Zhenghao Yang Guangyu Jia Yang Du Ziwen Fang Xu Gao Guangyu He Zhengbiao Wang National Key Lab of Aerospace Power System and Plasma Technology Air Force Engineering University Xi’an Shaanxi 710038 China School of Mechanical Engineering Xi’an Jiaotong University Xi’an Shaanxi 710049 China Science and Technology on Diesel Engine Turbocharging Laboratory China North Engine Research Institute Tianjin 300400 China

The ammonia-hydrogen dual-fuel elliptical rotary engine (AH-ERE) is a promising novel power system within the low-carbon context. To enhance the combustion and emission performances of AH-ERE, this paper investigates the optimized high-tumble chamber arrangement from both aspects of cylinder configuration (front configuration FC, middle configuration MC, and rear configuration RC) and hydrogen injection angle ( HIA = 0°, 45°, and 60°). On this basis, the characteristics of the flow field and mixture distribution under different operating conditions are compared from the perspective of in-cylinder swirl and tumble flow emphatically. Finally, the improvement of combustion, power and emission performance by cylinder configuration and HIA is analyzed. The results indicate that under MC-A60 condition, the hydrogen jet tends to accumulate inside the external chamber due to the effect of wall blocking and high tumble ratio. This phenomenon significantly promotes the flame propagation, resulting in the highest indicated power of 11.30 kW and NO x emission of 41.07 ppm. As the HIA decreases to 45°, the dispersed combustion caused by long hydrogen penetration distance and high TKE leads to a 55.10 % reduction in NO x , at a slight expense of power performance. In comparison, the RC cylinder has more uniform hydrogen distribution and significant clockwise tumble. The RC-A30 condition can reduce NO x emission to 20.09 % of MC-A60 condition while maintaining the indicated power of 10.87 kW, performing better in terms of emission performance.

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