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Design and Application of Turbine Cascade Partitioned Endwall Profiling

Journal of Thermal science 2025年第1期34卷 110-128页

作者： ZENG Fei JIANG Ruiqi XUE Xingxu DU Wei LUO Lei ZHOU Xun AECC Hunan Aviation Powerplant Research Institute Zhuzhou 412002China School of Energy Science and Technology Harbin Institute of TechnologyHarbin 150001China Science and Technology on Diesel Engine Turbocharging Laboratory China North Engine Research InstituteTianjin 300270China

The influence of partitioned profiling design based on a large-pitch highly loaded cascade is studied by numerical *** partitioned profile is mainly composed of a pressure-side convex structure near the leading edge and a suction-side convex structure at the midstream and downstream sides of the *** influence of the change in the vertex axial position and peak value of the B-line on the secondary flow control is *** this paper,air(ideal gas)is selected as the flow *** average static pressure at the outlet and the average total temperature at the inlet are kept *** γ-θ is used as the turbulence *** results show that the pressure-side convex structure suppresses the spanwise and pitchwise migration of the inlet flow by adjusting the static pressure distribution of the flow field,so the development of the pressure-side leg of the horseshoe vortex is effectively *** suction-side convex structure adjusts the static pressure distribution of the flow field and increases the included angle between the cross-flow and suction surface,so the accumulation of low-momentum fluid,the development of a corner vortex and the flow separation at the trailing edge of the suction-side surface are all suppressed near the endwall-suction ***,the energy loss coefficient of the large-pitch highly loaded cascade is decreased from 0.0564 to 0.0485,representing a 25% reduction in secondary flow losses.

关键词： large-pitch highly loaded cascade highly loaded design non-axisymmetrical endwall design secondary flow control partitioned endwall profiling

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Aerodynamic Comparison between Increasing Cascade Pitch and Turning Angle in the Highly-Loaded Design

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Journal of Thermal science 2022年第5期31卷 1709-1722页

作者： ZHOU Xun XUE Xingxu DU Xin LUO Lei WANG Songtao School of Energy Science and Engineering Harbin Institute of TechnologyHarbin150001China Science and Technology on Diesel Engine Turbocharging Laboratory China North Engine Research InstituteTianjin300270China

Theoretical and numerical study was carried out based on a linear turbine cascade(the Basic cascade)to compare the influences of the increased cascade pitch and turning angle in this *** one hand,the two highly-loaded designs both reduced the stability of flow field through enhancing adverse pressure gradient and span-wise pressure gradient of the fluid near suction ***,the two highly-loaded designs would both result in thicker boundary layer and stronger secondary flow,so the secondary loss would be increased and more difficult to suppress in the highly-loaded *** the other hand,the two highly-loaded designs showed different influences on the pitch-wise migration of the fluid near the endwall(cross flow)because of the different load enhancing *** other words,the increased cascade pitch(TCx highly-loaded design)would delay the pitch-wise migration of the horseshoe vortex because of the increased channel width,while the increased turning angle(Turn highly-loaded design)would do the opposite because of the increased pitch-wise pressure *** a result,the enhancement of the interaction between the fluid near the suction surface and the cross flow would be much stronger in the Turn highly-loaded design than the TCx highly-loaded design,and the span-wise developing tendencies of vortexes and fluid near the suction surface would show much stronger enhancing tendency in the former than the latter.

关键词： linear turbine cascade highly-loaded design secondary flow enhancing pattern enhancing mechanism

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Dynamics and stability analysis of unbalance responses in mid-positioned electrically assisted turbocharger rotor

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International Journal of Mechanical System Dynamics 2024年第4期4卷 515-535页

作者： Mingyue Hu Shuqian Cao Xiaolin Cao Zhiyong Zhang Rixiu Men Zhenzhen You Tianyou Wang School of Mechanical Engineering Tianjin UniversityTianjinChina Tianjin Key Laboratory of Nonlinear Dynamics and Control TianjinChina National Key Laboratory of Vehicle Power System TianjinChina Science and Technology on Diesel Engine Turbocharging Laboratory China North Engine Research InstituteTianjinChina

Electrically assisted turbochargers(EAT)improve intake efficiency by motor-assisted compressor impeller rotation,enhancing the system's transient ***,the addition of motor rotor components has increased the number of unbalanced positions in the shaft system,leading to problems such as excessive compressor end vibration and complex changes in oil film *** evaluate the effects of unbalance in the motor rotor,along with the parameters of floating ring bearings(FRB),on the dynamic response of EAT,a finite element model of an EAT rotor supported by nonlinear FRB is developed,and the vibration response of the compressor end bearing is obtained by numerical *** results indicate:(1)In contrast to the effect of compressor and turbine unbalance,proper motor rotor unbalance is more effective in suppressing oil whirl instability in the high-speed operating ***,a new inner oil film whirl“instability interval”is also induced in the low-speed operating range,leading to an increase in the Y1 compressor-end amplitude at low and medium speeds,and this“instability interval”increases with the amount of unbalance.(2)When an oil whirl occurs in the oil film,the maximum eccentricity of the bearing surges and is greater than 0.3,which can be used as an effective threshold for determining whether the oil film is unstable in engineering applications.(3)A suitable outer oil-film clearance range should be 35–40μm,otherwise,a wide range of outer oil-film whirl instability *** the amount of unbalance and oil-film clearance to suppress the subsynchronous vibration of the EAT,provides a theoretical basis for the design of the dynamics of the nonlinear rotor bearing system and improves the stability of the turbocharger's operation.

关键词： electrically assisted turbocharger motor unbalance oil-film clearance rotor dynamics nonlinear vibration

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Experimental Study on diesel Spray and Flame Asymmetry Characteristics of Dual-Orifice Nozzles for a Medium-Speed engine

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Journal of Thermal science 2025年第1期34卷 303-322页

作者： JU Dehao LIURui ZHENG Liang DENG Jiahui ZHANG Wenzheng HUO Jinlu HUANG Li Shanghai Marine Diesel Engine Research Institute Shanghai 201108China National Key Laboratory of Marine Engine Science and Technology Shanghai 201108China Key Laboratory for Power Machinery and Engineering Ministry of EducationShanghai Jiao Tong UniversityShanghai 200240China

The asymmetry of the multi-orifice spray will cause uneven heat load of the marine diesel engine,thereby affecting its working performance and service ***,an in-depth understanding of the spray and flame characteristics of multi-orifice nozzles will guide the optimization of the nozzle structure,needle design and diesel atomization and combustion *** this reason,four groups of dual-orifice nozzles with different hole diameters(0.1-0.55 mm)and mass flow rates covering the typical marine medium-speed diesel injections are designed and customized,and the constant volume chamber(CVC)with high temperature and pressure is used to simulate the actual in-cylinder working conditions of the diesel engine for the spray visualization *** study the asymmetry of the fuel sprays discharged from a diesel injector,the multi-orifice nozzle is simplified as a dual-orifice nozzle in this *** with X-ray Computed Tomography(CT)imaging technology,the influences of the nozzle internal structure on the spray and flame asymmetry are studied in the constructed supercritical *** is found that the asymmetry of the inlet angle and the equivalent length-diameter ratio is positively correlated with the inconsistency of the dual *** an increase in the injection pressure and nozzle diameter,the asymmetry of the dual spray becomes more pronounced,resulting in greater disparities in the ignition delay times and ignition positions of the two ***,the increase in nozzle diameter also leads to combustion instability,resulting in a flame with a serrated *** the increase of ambient temperature,the proportion of liquid phase in the jet decreases and the relative density of spray front decreases.

关键词： dual-orifice nozzle nozzle structure atomization spray flame asymmetry

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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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Lubrication condition monitoring of journal bearings in diesel engine based on thermoelectricity

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Friction 2024年第11期12卷 2532-2547页

作者： Yuhao LV Hao LIU Zhigang CHEN Weijie CHANG Hui ZHANG Hulin LI Shanghai Jiao Tong University Shanghai 200240China National Key Laboratory of Marine Engine Science and Technology Shanghai 201108China Shanghai Marine Diesel Engine Research Institute Shanghai 201108China Hunan Aviation Powerplant Research Institute Aero Engine Corporation of ChinaHunan 412002China

There is still a lack of effective lubrication condition monitoring methods in the field of diesel *** paper proposes a novel thermoelectric approach to divide the lubrication state of ***,the generation mechanism of thermoelectric potential on bearings is ***,both experimental and simulation studies are done,and a strong correlation between lubrication and thermoelectric potential is *** film thickness and temperature are further confirmed as significant factors influencing thermoelectric ***,the thermoelectric potential increases with ***,a small film thickness ratio(when the film thickness ratio is less than 4)will suppress the thermoelectric *** typical lubrication states of bearings are distinguished through thermoelectric potential and supported by the Stribeck curve ***,the significant influence of lubrication on the bearing is confirmed through the analysis of surface morphology and composition.

关键词： journal bearing lubrication state,thermoelectric potential condition monitoring

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Model predictive control for on-orbit inspection mission with signal temporal logic specifications

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Aerospace Systems 2025年 1-13页

作者： Zhao, Zeyang Zhang, Jian Zhang, Yi Shen, Qiang Shanghai Jiao Tong University Shanghai200240 China National Key Laboratory of Marine Engine Science and Technology Shanghai201108 China Shanghai Marine Diesel Engine Research Institute Shanghai Shanghai201108 China

This paper proposes a model predictive control (MPC) algorithm for a small satellite to accomplish on-orbit inspection missions. The relative dynamics of satellite is modelled first. Then, multiple constraints are taken into account for the on-orbit inspection missions, including input saturation, obstacle avoidance, velocity limit, and task specifications. To precisely formulate the tasks, the signal temporal logic (STL) framework is employed, where an auxiliary function is required to be designed based on the robust semantics of STL formulas. Considering the impact of input saturation, the proposed algorithm designs the auxiliary function in the form of cube power function, and incorporate it into the optimization problem in MPC. After that, the terminal ingredients are designed, whose parameters can be efficiently calculated based on linear matrix inequality techniques. Finally, numerical simulation is applied to validate the effectiveness of the proposed control strategy. © Shanghai Jiao Tong University 2025.

关键词： Predictive control systems

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A Strategy to Control the Turbocharger Energy of a diesel engine at Different Altitudes

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Fluid Dynamics & Materials Processing 2023年第4期19卷 959-975页

作者： Jianghua Cheng Xiaojian Li Lei Shi Kangbo Lu Ling Leng National Key Laboratory of Diesel Engine Turbocharging Technology China North Engine Research InstituteTianjin300400China School of Mechanical Engineering Tianjin UniversityTianjin300073China Key Laboratory for PowerMachinery and Engineering of Ministry of Education Shanghai Jiao Tong UniversityShanghai200240China

Power deterioration is a major problem for diesel engines operating at high *** problem stems from the limited availability of turbocharger energy,which is not enough to increase the boost pressure to the required *** this study,a control strategy is introduced in order to achieve engine power recovery at different *** is shown that as the altitude increases from 0 to 4500 m,the required boost pressure ratio increases from 2.4 to *** needed turbocharger energy should be increased accordingly by 240%,and the TCC(turbine characterization coefficient)should be adjusted within wide ranges.A 12%decrease in the TCC can lead to a rise of the intake air pressure,which can compensate the pressure decrease due to a 1000 m altitude *** fluctuation range of boost pressure was within 14.5 kPa for variations in altitude from 0 to 4500 m.

关键词： Turbocharger energy turbine characterization coefficient altitude diesel engine operating altitude

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Simulation of lubrication on rough surfaces with multiscale lubrication neural networks

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science China(Technological sciences) 2025年第3期68卷 192-203页

作者： Yihu TANG Li HUANG Limin WU Xianghui MENG School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai200240China National Key Laboratory of Marine Engine Science and Technology Shanghai201108China Shanghai Marine Diesel Research Institute Shanghai201108China

The simulation of lubrication on rough surfaces is essential for the design and optimization of tribological *** the application of physics-informed neural networks(PINNs)in analyzing hydrodynamic lubrication has been increasing,their implementation has predominantly been restricted to smooth *** limitation arises from the inherent spectral bias of conventional PINN methodologies,which tend to prioritize the learning of low-frequency features,thereby hindering their ability to analyze rough surfaces characterized by high-frequency signals *** date,there have been no reported instances of PINN methodologies being applied to rough surface *** response to these challenges,this paper presents an innovative multiscale lubrication neural network(MLNN)architecture that incorporates a trainable Fourier feature *** integrating learnable feature embedding frequencies,this architecture is capable of automatically adjusting to various frequency components,thus improving the analysis of rough surface *** proposed method has been evaluated across a range of surface topographies,with results compared to those derived from the finite element method(FEM).The comparative analysis indicates a high degree of consistency between the MLNN results and those obtained through ***,this novel architecture demonstrates superior performance in terms of both accuracy and computational efficiency when compared to traditional Fourier feature networks that utilize fixed feature embedding *** a result,the MLNN model represents a more effective tool for the analysis of lubrication on rough surfaces.

关键词： physics-informed neural network Fourier feature embedding multiscale lubrication rough surface

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RESEARCH ON SHAFT CENTERING MONITORING MODEL OF SHIP PROPULSION SYSTEM 30

RESEARCH ON SHAFT CENTERING MONITORING MODEL OF SHIP PROPULS...

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30th International Congress on Sound and Vibration, ICSV 2024

作者： Wenkun, Fan Zongpeng, Tong Ningyuan, Duan Bo, Liu Chao, Hou Shengjun, Wang Shanghai Marine Diesel Engine Research Institute Shanghai China National Key Laboratory of Marine Engine Science and Technology Shanghai China

ISBN: (纸本)9789090390581

This paper focuses on the problem of shaft centering real-time monitoring for ship propulsion system under elastic installation condition. The technology of ship propulsion system shaft centering monitoring under elastic installation condition is researched. Based on the rigid body assumption and spatial geometric mapping relationship[1], the theoretical model of ship propulsion system shaft centering attitude monitoring is established using the static-dynamic united analyzing method. The state monitoring algorithm of ship propulsion system under multi-point elastic support condition is studied. The theoretical model is then corrected through field validation, and the influence of different attitude parameters on the shaft centering monitoring of the ship propulsion system is analyzed. At last, the real time shaft centering monitoring method is proposed for the ship propulsion system under elastic installation conditions. © 2024 Proceedings of the International Congress on Sound and Vibration. All rights reserved.

关键词： Ship propulsion

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