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Cellular structure of detonation utilized in propulsion system

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Science China(Physics,Mechanics & Astronomy) 2012年第10期55卷 1915-1924页

作者： ZHANG XuDong FAN BaoChun GUI MingYue PAN ZhenHua Science and Technology on Transient Physics Laboratory Nanjing University of Science and TechnologyNanjing 210094China

How to confine a detonation in a combustor is a key issue of detonation applications in propulsion *** on achieving schemes,detonations applied in the combustor,including pulse detonation wave(PDW),oblique detonation wave(ODW) and rotating detonation wave(RDW),are different from that described by the classic CJ theory in fine structures and its self-sustaining *** this work,the cellular structures and flow fields of ODW and RDW were obtained numerically,and the fundamental characteristics and self-sustaining mechanisms of the detonations were analyzed and *** front consists of three parts:the ZND-like front,the single-headed triple point front and the dual-headed triple point *** structures of RDW are heterogeneous,and the cell size near the outer wall is smaller than that near the inner wall.

关键词： propulsion system fundamental characteristics self-sustaining mechanisms classic CJ theory

Static aeroelasticity of the propulsion system of ion propulsion unmanned aerial vehicles

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propulsion and Power Research 2023年第3期12卷 336-355页

作者： Shuai Hao Tielin Ma She Chen Hongzhong Ma Jinwu Xiang Fangxiang Ouyang School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China Research Institute of Unmanned systems Beihang UniversityBeijing 100191China Hiwing General Aviation Equipment Co. Ltd.Beijing 100074China College of Electrical and Information Engineering Hunan UniversityChangsha 410082China

“Ionic wind”generators are used as the main propulsion system in ion propulsion unmanned aerial vehicles(UAVs).Owing to the large size and poor stiffness of the electrode array in the propulsion system,the electrode array is prone to deformation under the flight *** this work,the thrust characteristics and static aeroelastic properties of“ionic wind”propulsion systems were analyzed in *** simulation model for an“ionic wind”propulsion system was established by coupling a two-dimensional gas discharge model with a gas dynamics *** influences of electrode voltage,spacing,size,and shape on the performance of the propulsion system were *** fluid-solid interaction method was used to solve static aeroelastic characteristics under *** aerodynamic and thrust performances of the elastic state and the rigid state were *** was found that the operating voltage,the distance between two electrodes,and the emitter radius had greater impacts on the thrust of the propulsion *** propulsion system had a small contribution to the lift but a large contribution to the *** the elastic state,the lift coefficient accounted for 12.2%,and the drag coefficient accounted for 25.8%.Under the action of the downwash airflow from the wing,the propulsion system formed an upward moment around the center of mass,which contributed greatly to the pitching moment derivative of the whole *** the elastic state,the pitching moment derivative accounted for 29.7%.After elastic deformation,the thrust action point moved upward by 28.7 ***,the no lift pitching moment is reduced by 0.104 N$m,and the pitching moment coefficient is reduced by 0.014,causing a great impact on the longitudinal trimming of the whole aircraft.

关键词： Ion propulsion unmanned aerial vehicle(UAV) propulsion system Electro-aerodynamics Static aeroelasticity Fluid-solid interaction

On Joint Hardware-in-the-loop Simulation of Aircraft Control system and propulsion system 36

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On Joint Hardware-in-the-loop Simulation of Aircraft Control...

A new marine propulsion system

第36届中国控制会议

作者： Yao Zhao Wei Zhang De-bin Sang Sang Yu Beijing Aerospace Automatic Control Institute

ISBN: (纸本)9781538629185

A novel hardware-in-the-loop（HIL） simulation system of aircraft is presented in this *** simulation aims to evaluate the performance of the aircraft flight control system and propulsion system with the influence of coupling characteristics between the two *** simulation system is designed and established based on the on-board devices and simulation equipment,such as flight control computer,engine controller,servo actuators and ground simulation *** order to meet the requirement of real-time,the simulation software is developed based on the real-time extension（RTX） operating *** presented system has been successfully utilized in the joint HIL simulation experiment of an aircraft to test its flight control system and population *** results show that the simulation system runs stably and reliably,and it can be an effective platform for the design and evaluation of the aircraft before its flight test.

关键词： Joint simulation HIL Flight control system propulsion system Real-time RTX

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Journal of Marine Science and Application 2003年第1期2卷 30-34页

作者： HAN Wei-shi, LIU Tao School of Power and Nuclear Energy Engineering, Harbin Engineering University, Harbin 150001, China School of Power and Nuclear Energy Engineering Harbin Engineering University Harbin China

A new marine propulsion system is proposed . A small liquid sodium cooled reactor acts as prime mover; alkali-metal thermal-to-electric conversion ( AMTEC) cells are employed to convert the heat energy to electricity; superconducting magneto-hydrodynamic thruster combined with spray-water thruster works as pr opulsion. The configuration and characteristics of this system are described. Such a nuclear-powered propulsion system is not only free of noise, but also has high reliability and efficiency. It would be a preferable propulsion system for ships in the future.

关键词： propulsion system liquid sodium cooled reactor AMTEC Thruster

Simulation of Large Low Speed Two-Stroke Diesel Engine propulsion system and Design of Self-adaptive Governor

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Simulation of Large Low Speed Two-Stroke Diesel Engine Propu...

The propulsion system of Shenzhou 13 Manned Spaceship

Asian Simulation Conference/The 6th International conference on system Simulation and Scientific Computing

作者： SUN Jianbo, GUO Chen (School of Automation and Electrical Engineering, Dalian Maritime University, Dalian, 116026)

Based on the modeling method of the co-operation between the characteristic maps and the mathematical equations, a propulsion system simulation model which includes model for large low speed two-stroke diesel engine (MAN B&W 10L90MC) and model for shaft, propeller and ship hull dynamics are proposed. To calculate propeller's characteristic, the regression functions are represented. The simulation experiments demonstrate the model can be used for engine performance prediction as well as investigate control schedules of marine propulsion system. A self-adaptive control scheme for governor which identifies system state by means of input and feedback signals and changes PID control parameters is proposed. The simulation results show that it can improve the dynamic response of the propulsion system.

关键词： marine diesel engine modeling electronic control self-adaptive control propulsion system governor

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Aerospace China 2022年第1期23卷 27-32页

作者： GU Shuaihua LU Fei Shanghai Institute of Space propulsion hanghai 201112

Based on the requirements of manned spaceships,this paper introduces the characteristics of the propulsion system from the perspectives of design scheme,basic composition,safety and reliability measures,and also introduces the ground test verification and on-orbit flight characteristics of the Shenzhou 13 propulsion *** to the flight results,it was seen that the performance of the Shenzhou 13 propulsion system fully met the engineering requirements for the manned space mission.

关键词： manned spaceflight Shenzhou 13 spaceship propulsion system

Aquatic unmanned aerial vehicles(AquaUAV):Bionic prototypes,key technologies,analysis methods,and potential solutions

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Science China(Technological Sciences) 2023年第8期66卷 2308-2331页

作者： WANG XinYang YANG XingBang ZHAO JiaWei PEI Xuan SU HaoHong WANG TianMiao HOU TaoGang School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China School of Mechanical Engineering and Automation Beihang UniversityBeijing 100083China School of Biological Science and Medical Engineering Beijing Advanced Innovation Centre for Biomedical EngineeringKey Laboratory for Biomechanics and Mechanobiology of Ministry of EducationBeihang UniversityBeijing 100083China

Some research on aircraft is largely inspired by *** them,aerial-aquatic amphibians with trans-media locomotion capabilities have greatly promoted the development of aquatic unmanned aerial vehicles(Aqua UAV).In this article,the studies of Aqua UAV are sorted out by their biological counterpart and summarized in chronological order from 2005 to *** further understand the key technologies of Aqua UAV,we focus on the structural compatibility design of wing and aerial-aquatic propulsion methods by analyzing their advantages and *** addition,the analysis methods of kinematics and dynamics performance of Aqua UAV for simulation and experiment are involved in the process of studying the kinematics,lift/drag,and propulsion of ***,we present several challenges and propose some potential solutions to improve the ability of Aqua UAV in the future.

关键词： aquatic unmanned aerial vehicle(AquaUAV) variable wing design propulsion system computer simulation

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Progress of continuously rotating detonation engines

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Chinese Journal of Aeronautics 2016年第1期29卷 15-29页

作者： Zhou Rui Wu Dan Wang Jianping Center for Combustion and propulsion College of Engineering Peking University Center for Applied Physics and Technology Peking University State Key Laboratory for Turbulence & Complex systems Peking University

Continuously rotating detonation engine （CRDE） is a focus for concern in the field of aerospace propulsion. It has several advantages, including one-initiation, high thermal efficiency and simple structure. Due to these characteristics, it is expected to bring revolutionary advance- ments to aviation and aerospace propulsion systems and now has drawn much attention throughout the world. In this paper, an overview of the development of CRDE is given from several aspects： basic concepts, applications, experimental studies, numerical simulations, and so on. Representative results and outstanding contributions are summarized and the unresolved issues for further engi- neerin~ applications of CRDE are 13rovided.

关键词： Aerospace Continuously rotatingdetonation CRDE Detonation engine propulsion system

propulsion Shaft and Gearbox Failure in Marine Vessels: A Duration Model Analysis

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Journal of Transportation Technologies 2020年第4期10卷 291-305页

作者： D. E. Onwuegbuchunam I. C. Ogwude C. C. Igboanusi K. O. Okeke N. N. Azian Department of Maritime Management Technology Federal University of Technology Owerri Nigeria Department of Transport Management Technology Federal University of Technology Owerri Nigeria Strauz Marine & Engineering Ltd. Federal Ocean Terminal (FOT) Onne Nigeria

The need to mitigate downtime in marine vessels arising from propulsion system failures has led ship operating companies to devote enormous resources for research based solutions. This paper applied duration models to determine failure probabilities of shaft and gearbox systems in service boats. Using dockyard’s event history data on boat repairs and maintenance, we applied Kaplan Meier hazard and survival curves to analyse probability of failure of shaft and gearbox systems in supply, crew and tug boats. We found that average time to shaft and gearbox failure was 8.33, 5.23 and 5.21 months for tug, supply and crew boats respectively. The hazard plots however, showed that supply boats had higher probability of failure than crew boats and then tug boats in that order. Further analysis using Cox regression model showed that the boats’ shaft and gearbox system failures were significantly affected by level of lubrication oil, stress corrosion cracking and impacts on the propulsion system’s components. The paper proposes that design of maintenance

关键词： Shaft and Gearbox Failure propulsion system Hazard Rates Survival Analysis Service Boats