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Application of Tandem Cascade to Design of Fan stator with Supersonic Inflow

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Chinese Journal of Aeronautics 2010年第1期23卷 9-14页

作者： Li Qiushi,Wu Hong,Zhou Sheng School of Jet Propulsion,Beijing University of Aeronautics and Astronautics,Beijing 100191,China School of Jet Propulsion Beijing University of Aeronautics and Astronautics Beijing 100191 China

This article proposes a tandem cascade constructed to tackle the thorny problem of designing the high-loaded stator with a supersonic inflow and a large turning angle. The front cascade adopts a supersonic profile to reduce the shock wave intensity turning the flow into subsonic,while the rear cascade adopts a subsonic profile with a large camber offering the flow a large turning angle. It is disclosed that the losses would be minimized if the leading edge of the rear cas- cade lies close to the pressure side of the front cascade at a distance of 20% pitch in pitch-wise direction without either axial spacing or overlapping in axial direction. The 2D numerical test results show that,with the inflow Mach number of 1.25 and the turning angle of 52° ,the total pressure loss coefficient of the tandem cascade reaches 0. 106 ,and the diffusion factor 0. 745. Finally,this article has designed and simulated a high-loaded fan stage with the proposed tandem stator,which has the pressure ratio of 3.15 and the efficiency of 86.32% at the rotor tip speed of 495.32 m/s.

关键词： fan/compressor tandem cascade stator supersonic inflow

Numerical Investigation of the Bowed stator Effects in a Transonic Fan at LowReynolds Number

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Journal of Thermal Science 2017年第1期26卷 25-29页

作者： HUANG Enliang ZHAO Shengfeng GONG Jianbo LU Xingen ZHU Junqiang Key Laboratory of Light-duty Gas-turbine Institute of Engineering Thermophysics Chinese Academy of Sciences Bei-jing 100190 China

The performance of fan stage in a small turbofan engines is significantly affected at high-altitude low Reynolds number. In order to examine the effect of low Reynolds number on the fan stage, 3D numerical simulation method was employed to analyse the performance variations and the underlying flow structure in the fan stage. For the sake of decreasing the influence of low Reynolds number, the different bowed stator airfoils were redesigned and the effect of the modified design was evaluated.

关键词： Transonic Fan Low Reynolds Number Bowed stator

Design,analysis and control of hybrid excited doubly salient stator-permanent-magnet motor

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Science China(Technological Sciences) 2010年第1期53卷 188-199页

作者： ZHU XiaoYong1,2 & CHENG Ming1 1 Engineering Research Center for Motion Control of MOE,School of Electrical Engineering,Southeast University,Nanjing 210096,China 2 School of Electrical and Information Engineering,Jiangsu University,Zhenjiang 212013,China Engineering Research Center for Motion Control of MOE School of Electrical Engineering Southeast University Nanjing China School of Electrical and Information Engineering Jiangsu University Zhenjiang China

In this paper,a new hybrid excited doubly salient stator-permanent-magnet motor is proposed,where both permanent magnets and DC field windings are located in the stator.In theory,the mathematical model and design method of the motor are developed.The corresponding output power equation and the relationship between the flux control capability and the extended speed range are deduced in details.By using an efficient "one-step" three-dimensional(3D) finite element method,the electromagnetic performances are analyzed,in which the leakage flux outside the stator circumference and end-effect are taken into account.Based on the operation principle of the motor,the control strategy and scheme are developed and implemented experimentally.Both experimental results and finite element analysis show that the proposed motor not only maintains the advantages of doubly salient permanent magnet motors,but also offers high energy efficiency over a wide speed range,which makes the motor an interesting candidate for electric vehicles.

关键词： stator permanent magnet motor hybrid excitation doubly salient finite element method flux weakening control

Experimental Analysis of A Cooling System for Wind-Driven Generator stator

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Transactions of Nanjing University of Aeronautics and Astronautics 2016年第2期33卷 180-186页

作者： Qian Xiaohui Jiang Yanlong Cheng Danfeng Liu Juan College of Aerospace Engineering Nanjing University of Aeronautics & Astronautics Shanghai Aircraft Design & Research Institute Commercial Aircraft Corporation of ChinaLtd

A novel cooling system with cooling channels is proposed for the stator of 3MW wind-driven generator.An experimental platform is built to investigate the performance of the cooling system with different loads.At30%,50% or 80% generator loads,the temperatures meet the design requirement.However,it is a little over the requirement at 100%load,duo to experimental errors and some unknown thermal resistances.In the test at 100%load,the developing trends of the parameters of these two generators are similar and only minor differences occurs when they reach steady state our work can be benefit for the design and improvement of MW wind-driven generator cooling solutions.

关键词： wind-driven generator stator cooling channels cooling method, experimental study

Parameter Modeling and Kinematical Simulation for Rotor and stator of Screw Pump

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Journal of Donghua University(English Edition) 2013年第1期30卷 38-43页

作者：倪益华吴健过海 Mechanical Department of Engineering College Zhejiang A & F University Department of Mechanical Engineering Zhejiang University

The research object used in the dissertation was screw pump, which was widely applied in engineering field. The analysis of end face profile formation was completed on its main working components, i.e., rotor and stator. With the purpose of finding optimal parameters to improve the efficiency of screw pump design, the key technologies involved in the parametric modeling of rotor and stator were analyzed. The three-dimensional (3D) design software SolidWorks was used for the secondary development and parametric modeling of rotor and stator. After that the simulation models of different kinds of screw pumps were established based on the cycloid type, variation coefficient, and screw head number. Finally the COSMOSMotion was used to analyze the motion characteristics on the equidistant line of rotor, including velocity and acceleration. This design and modeling method has been used in screw pump enterprises for design and development, laying the foundation for finite element analysis and further optimization of screw pump.

关键词： parameter modeling simulation rotor stator screw pump

Calculation for electromagnetic torque of double-stator-permanent magnet synchronous motor

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Journal of Harbin Institute of Technology(New Series) 2000年第2期7卷 58-61页

作者：柴凤朱春波程树康 Dept. of Electric Engineering Harbin Institute of Technology Harbin 150001 China

Presents the mathematic model built for double stator permanent magnet synchronous motors through a brief analysis of their future development, and the equations established for calculation of their torques, and the development of prototypes, and discusses the comparison of the motor under development with the conventional motors with the same volume, stator structure, and magnet shape, and concludes the motor under development is one of the ways to improve the performance/volume ratio of motors.

关键词： double stator electromagnetic torque synchronous motor

For Propulsion Applications It Is Possible to Utilize Both the Torque Output of the Rotor and the Reactional Torque Acting on the stator of the Driving Electric Motor by Linearizing the stator

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Energy and Power Engineering 2021年第5期13卷 163-173页

作者： Salah Abunaieb Sogex Oman LLC Muscat Sultanate of Oman

This paper presents a novel idea of utilizing the reactional torque of the conventional electric motor as a linear output for propulsion in addition to the conventional torque output of the rotor. The idea is demonstrated by a theoretical proposal of linearizing the stator of one of the most used motors in Electrical Vehicles and Hybrid Vehicles. The proposed Linear Stator Motor is a simple modification without involving any functional change of the conventional motor. Though theoretical, the indicated possible input energy saving of more than 75% as compared to the conventional motor is no surprise, as by linearizing the stator, an almost equal linear propulsion output is added to the conventional rotor output. In addition to this remarkable saving in input energy, the proposed Linear Stator Motor that suits all types of vehicles, can maintain propulsion without the need for a mechanical transmission system. Also, in the case of watercraft and aircraft vehicles, no external mechanical propulsion drive system is required. It is just an internal force that can push the vehicle forward, backward, or laterally, while the conventional rotor output can be utilized for energy recovery by driving a DC generator.

关键词： BLDC Motor Electrical Vehicle Hall Effect Linearization Newton’s Third Law of Motion Propulsion Rotor stator

Performance Optimization of Diesel Generators Using Permanent Magnet Synchronous Generator with Rotating stator

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Energy and Power Engineering 2019年第7期11卷 259-282页

作者： Mohammadjavad Mobarra Mohamad Issa Miloud Rezkallah Adrian Ilinca Wind Energy Research Laboratory (WERL) Université du Québec à Rimouski Rimouski Canada Electrical Engineering Department Ecole de Technologie Supérieure (ETS) Montréal Canada

One of the solutions to reduce fuel consumption of diesel generators (DG) is to adapt the rotational speed to mechanical torque of the crankshaft. When load power decreases, a reduction in both mechanical torque and rotational speed of the diesel engine will maintain the combustion efficiency near the levels of the nominal regime. Accordingly, the generator itself should operate at a variable speed which normally requires power electronics converters. In this paper, we are exploring a new generator concept that uses a stator rotating in opposite direction to the rotor such as the relative velocity between the two components remains constant when diesel engine slows down. The stator itself is driven by a compensator synchronous motor (CM) such as the relative velocity of the rotor is constant, eliminating as such sophisticated power electronics. The model developed for the synchronous machine with a rotating stator is based on Park’s transformation. This new concept was modelled using MATLAB software. Experimental analysis has been conducted using a 500-kW diesel GENSET equipped with a permanent magnet synchronous generator (PMSG). The numerical and experimental results are in good agreement and demonstrate that fuel consumption is reduced with a rotating-mode stator for PMSG during low electrical loads.

关键词： Diesel Generator Park Transformation Rotating stator Fuel Optimization Rotating Reference Frame

A new design of stator magnetic system for 3-phase & 12-pole HB stepper

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Journal of Harbin Institute of Technology(New Series) 1999年第3期6卷 52-56页

作者：任雷史敬灼王宗培

A new design of stato magnetic System is Proposed for 3-phase & 12-pole HB stepper, and it features bet-ter distribution of magntic lield to incare Pullou tope and bopmve Operaonal stability of moor and minimummutual inductance between phase windimp to make design of control circuit easier, and application proved it is as good as expected.

关键词： HB stepper stator magnetic system 3-phase stepper