检索结果-内蒙古大学图书馆

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Simulation of lubrication on rough surfaces with multiscale lubrication neural networks

引用

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

来源：评论

学校读者我要写书评

暂无评论

Interaction between the Microwave Plasma Generation and the Saturated Voltage during Microwave Pulse Assisted Ignition in ICE Lean Combustion

引用

Journal of Thermal science 2025年第2期34卷 639-652页

作者： SUN Wei CUI Yi SONG Dawei TONG Zongpeng WU Huimin WANG Zhaowen The Key Laboratory for Power Machinery and Engineering of the Ministry of Education Shanghai Jiao Tong UniversityShanghai200240China Shanghai Marine Diesel Engine Research Institute Shanghai200090China School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan430074China

Microwave-assisted ignition(MAI)is a promising technology to improve the ignition stability in internal combustion engines under lean *** investigate the interplay between the microwave pulses and the electrical characteristics of ignition plasma,the high-time-resolved electrical characteristics of MAI are measured based on the discharge voltage and current profiles with microwave power varying from 0 to 1000 *** effects of microwave pulse on the electrical characteristics in the breakdown and glow discharge phases are discussed *** results show that the microwave-induced-voltage-decline(MIVD)occurs during the glow discharge phase,which originates from the increment of free electrons and the additional microwave ***,this voltage decline is insignificant in the breakdown ***,as the free electron number reaches a critical value,a shining plasma can be observed between the gap of electrodes and the voltage decline is stabilized to a"saturated voltage curve".Ultimately,the effect of microwave plasma on the enhancement of ignition kernel area is *** result indicates that the enhancement effect increases with plasma duration *** enhancements of earlier-generated plasmas are more significant than those of subsequent plasmas due to the distance limit of the plasma propulsive effect.

关键词： microwave assisted ignition electrical diagnosis saturated voltage curve microwave plasma ignition enhancement

来源：评论

学校读者我要写书评

暂无评论

Influence of erosion on the flow inside the nozzle and spray atomization characteristics of a marine diesel engine 3

Influence of erosion on the flow inside the nozzle and spray...

引用

2024 3rd International Conference on Energy and Power engineering, EPE-AEIC 2024

作者： Peng, Yan Li, Hongmei Hu, Yuchen Li, Xiao Pu, Weihua Shanghai Marine Diesel Engine Research Institute Shanghai China National Key Laboratory of Marine Engine Science and Technology Shanghai China Key Laboratory for Power Machinery and Engineering Ministry of Education Shanghai Jiao Tong University Shanghai China

Due to the excellent output power and thermal efficiency, the marine diesel engine is the main source of power generation and propulsion for most marine ships at present. For diesel engines, the fuel injection system is the core of various advanced combustion control technologies. However, when the injector nozzle erosion occurs, the flow inside the nozzle and the injection characteristics of the injector will be influenced, which will affect the atomization of the spray and the subsequent combustion and engine performance. Therefore, in this paper, the influence of erosion on the flow inside the nozzle, and the spray atomization characteristics are studied by simulation. The results showed that erosion directly affects the flow rate inside the nozzle, which may be positive or negative. The erosion could generate stronger geometrically induced cavitation, which could lead to the further development of cavitation erosion. Besides, erosion can promote spray atomization to some extent. © Published under licence by IOP Publishing Ltd.

关键词： Cavitation

来源：评论

学校读者我要写书评

暂无评论

Reinforcing and toughening mechanism of the in-situ metastable nanostructured alumina-titanium oxide composite coating

引用

材料科学技术（英文版） 2025年第5期208卷 120-131页

作者： Yu-duo Ma Yong Yang Li-wu Yuan Wei Tian Hongjian Zhao Hebei Key Laboratory of New Functional Materials School of Materials Science and EngineeringState Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin 300401China Hebei Huabei Diesel Engine Co. Ltd.Shijiazhuang 050081China Hebei Key Laboratory of New Functional Materials School of Materials Science and EngineeringState Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin 300401China AECC Sichuan Gas Turbine Establishment Chengdu 610500China

High porosity and high brittleness are the main reasons that limit the long-term service life of the alumina-titanium oxide composite ***,a metastable nanostructured alumina-titanium oxide composite coating with high density and high properties was synthesized by plasma spraying of TiO2-Al composite *** main phases of the metastable nanostructured alumina-titanium oxide were y-Al2O3,TiO and *** coating,as prepared,contains various metastable microstructures,such as fine-grained,intra-/inter-granular,and"self-locking"*** metastable microstruc-tures are important for the improvement of hardness and toughness of the *** with other alumina-based composite coatings,the metastable nanostructured alumina-titanium oxide compos-ite coating showed the most impressive overall *** reinforcing and toughening mechanism of the metastable alumina-titanium oxide composite coating included fine grain strengthening and self-toughening of the metastable microstructure.

关键词： In-situ synthesis Metastable oxide Nanostructured coating Reinforcing and toughening mechanism

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Method for Evaluating the Reliability of Compressor Impeller of Turbocharger for Vehicle Application in Plateau Area

引用

Chinese Journal of Mechanical engineering 2016年第6期29卷 1218-1225页

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

As turbocharging diesel engines for vehicle application are applied in plateau area, the environmental adaptability of engines has drawn more attention. For the environmental adaptability problem of turbocharging diesel engines for vehicle application, the present studies almost focus on the optimization of performance match between turbocharger and engine, and the reliability problem of turbocharger is almost ignored. The reliability problem of compressor impeller of turhocharger for vehicle application when diesel engines operate in plateau area is studied. Firstly, the rule that the rotational speed of turbocharger changes with the altitude height is presented, and the potential failure modes of compressor impeller are analyzed. Then, the failure behavior models of compressor impeller are built, and the reliability models of compressor impeller operating in plateau area are developed. Finally, the rule that the reliability of compressor impeller changes with the altitude height is studied, the measurements for improving the reliability of the compressor impellers of turbocharger operating in plateau area are given. The results indicate that when the operating speed of diesel engine is certain, the rotational speed of turbocharger increases with the increase of altitude height, and the failure risk of compressor impeller with the failure modes of hub fatigue and blade resonance increases. The reliability of compressor impeller decreases with the increase of altitude height, and it also decreases as the increase of number of the mission profile cycle of engine. The method proposed can not only be used to evaluating the reliability of compressor impeller when diesel engines operate in plateau area but also be applied to direct the structural optimization of compressor impeller.

关键词： turbocharger plateau area compressor impeller failure behavior reliability

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：