The Fluid Flow Investigation of the Compact Motor with Medium-Size and High-Voltage in YJKK Series

2013 ◽  
pp. 93-103
Author(s):  
Dawei Meng ◽  
Jinze He ◽  
Yongming Xu
Keyword(s):  
Fluid Flow ◽  
High Voltage ◽  
Medium Size ◽  
Flow Investigation

Influence of Radial Position of Medium Size High Voltage Asynchronous Motor Stator Ventilation Channel Peri-Axle Terminal on Fluid Flow Pattern

2011 ◽  
Vol 201-203 ◽  
pp. 818-823
Author(s):  
Jia Bin Wen ◽  
Hong Yu Yan
Keyword(s):  
Fluid Flow ◽  
High Voltage ◽  
Optimization Design ◽  
Asynchronous Motor ◽  
Ventilation System ◽  
Flow Characteristics ◽  
Radial Position ◽  
Medium Size ◽  
Fluid Flow Characteristics ◽  
Ventilation Duct

Fluid flow inside radial ventilation duct is one of important facts which to decide the effect of ventilation and cooling, there is important significance to investigate.In this paper,according to the theory of Computational Fluid Dynamic(CFD),a YKK400-6、690kW medium size high voltage asynchronous motor was taken as an example.Created its 3D stator and rotor radial duct physical and mathematical model,basic assumptions and boundary conditions are determined according to CFD theories.The fluid fields are calculated and analyzed,and fluid field distribution inside radial ventilation duct is shown.Base on the length of the stator ventilation channel as a constant,changing the radial position of the stator ventilation channel peri-axle terminal,and the fluid flow characteristics are shown when the radial position was changed.Analyzing the fluid flow characteristics on either side of the stator winding,and obtaining the influence of the radial position of the stator ventilation channel peri-axle terminal on fluid flow characteristics.The results provided theoretical basis for the optimization design of motor ventilation system,and those paved the way for solving temperature field based on coupled field.

Numerical Analysis of a Torch-Ignition System for an Internal Combustion Engine

2015 ◽  
Vol 798 ◽  
pp. 234-238
Author(s):  
Fábio Radicchi ◽  
Raphael M. Braga ◽  
Raniro A. Coelho ◽  
Roberto B.R. Costa ◽  
Ramon Molina Valle
Keyword(s):  
Fluid Flow ◽  
Numerical Analysis ◽  
3D Model ◽  
Combustion Engine ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Spark Ignition Engines ◽  
Flow Investigation ◽  
Pollutants Emission ◽  
Turbulence Parameters

Torch ignition systems in spark-ignition engines represents an interesting option in the efforts to reduce pollutants emission and specific fuel consumption. Based on this idea, this paper presents a 3D model of a prechamber created for a spark-ignition engine and focuses on the numerical analysis of the fluid flow inside the modified chamber. This kind of analysis is very important once it allowed evaluating aspects like turbulence parameters, pressure inside the chamber and prechamber, fluid recirculation and a possible prechamber’s geometry for the engine. The studies were done in a four valve Single Cylinder Research Engine – SCRE. For the numerical modeling and fluid flow investigation was used STAR-CD software. Results show higher values of tumble ratio and kinetic energy with the prechamber.

The Coordinated Control Strategy for Generator-Transformer's Voltage Regulation

2014 ◽  
Vol 960-961 ◽  
pp. 1128-1133
Author(s):  
Yu Ze Zhang ◽  
Wen Ying Liu ◽  
Shu Xin Li ◽  
Wei Zhou Wang ◽  
Fu Chao Liu ◽  
...  
Keyword(s):  
High Voltage ◽  
Control Strategy ◽  
Coordinated Control ◽  
Voltage Regulation ◽  
Medium Size ◽  
Phase Lag ◽  
Auxiliary Power ◽  
Voltage Quality ◽  
Power Load

Nowadays the main electrical wiring in medium-size and large-size thermal power units is mostly unit wiring. In the quarter of small reactive power load, some generators need to work in phase-lag operation during the daytime and in phase-advancement operation at night to meet the demand of voltage quality of their plant’s high-voltage side. This operation, however, will lower the voltage of auxiliary power and do harm to system’s stability. This paper proposes a kind of coordinated control strategy for generator-transformer’s voltage regulation. In this strategy, the main transformer should be on-load tap charger and the controller regulate the generator voltage and transformation ratio simultaneously when needed, thus the voltage quality of both high-voltage side and auxiliary power side can be insured and the generator no longer work in phase-advancement operation. This control strategy can be a meaningful proposal for AVC in smart grid in the future. Simulation result shows the stability and reliability of the proposed control strategy.

Sign in / Sign up

Export Citation Format

Share Document