|Table of Contents|

Comprehensive influences of end cover grid on aerodynamic noise and temperature characteristics of an automobile alternator(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2022年04期
Page:
244-258
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Comprehensive influences of end cover grid on aerodynamic noise and temperature characteristics of an automobile alternator
Author(s):
HUANG Yan WANG Shi-yu JIANG Xiao-wen DONG Da-wei
(School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)
Keywords:
automotive engineering alternator comprehensive analysis aerodynamic noise temperature characteristic end cover grid
PACS:
U463
DOI:
10.19818/j.cnki.1671-1637.2022.04.019
Abstract:
To synchronically improve the aerodynamic noise performance and heat dissipation effect of the current alternator of new energy vehicles and meet the more stringent noise-, vibration-, and harshness- requirements. An alternator was taken as the research object, the comprehensive influence laws of end cover grids on the aerodynamic noise and temperature field distribution were analyzed by the bench experiment and numerical simulation method. The sound pressure level(SPL)distribution of noise was obtained by the five-point method, and the temperature distribution of key components was acquired on the basis of multi-thermocouple measurement points. The flow field, sound field, and temperature field distributions of the alternator were obtained by the computational fluid dynamics simulation software and electromagnetic Maxwell simulation software. The correctness of the numerical calculation model was verified by the experimental results. Upon the analysis of aerodynamic noise characteristics and temperature field characteristics of the original generator, the end covers with different angles of grid side walls were designed to reduce the kinetic energy loss caused by the cooling airflow impact. The reasonable matching of end cover grid angles and fan-blade airflow outlet angles was discussed, and with Newton's law of cooling, the effects of wavy end cover grids on the increase in the area of heat transfer surface and the reduction in aerodynamic noise were studied. Research results show that the end cover grid structure has a great contribution to the aerodynamic noise, and the cooling effect is also significantly affected by the structure. When the side wall of the end cover grid inclines at an angle of 40, a more reasonable match can be achieved with the airflow outlet angle of the fan blade, the energy loss caused by the cooling airflow impact can be effectively reduced. The maximum temperature of the three-phase stator winding reduces by 9.63 K, and the 12th-order aerodynamic noise lessenes by more than 3 dB(A). The wavy end cover grid increases the convective heat transfer area and airflow velocity, while reducing the aerodynamic impact. The heat dissipation of the end cover increases by 7.72 W, and the temperatures of stator core, end cover, and three-phase stator winding decrease by 5.12, 4.94, and 5.29 K, respectively. The 12th-order and 24th-order aerodynamic noises reduce by more than 3 dB(A)with the improvement in eddy currents by grids and the reduction of airflow impact on the grids. 4 tabs, 25 figs, 31 refs.

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Last Update: 2022-09-01