摘要
热阻和流阻是电力半导体用散热器的两个重要热工参数.本文介绍了风冷散热器的热阻和流阻测试系统中风洞和试验段的设计方法和过程.试验段最大尺寸为500mm×250mm,最大风速为15m/s,散热器最大压损800Pa.风洞气动结构采用了低速直流风洞设计,动力段布置在风洞入口,后面依次为扩张段、稳定段、收缩段和试验段,包括试验段在内,风洞总长度为5.2m,收缩比为5.76.根据气动计算结果,空风洞压力损失为201Pa,总输入功率为1.9kW.通过在试验段箱体内部设置由横板和立板组成的抽屉板,实现风道截面尺寸可调.横版与立板通过滑槽连接,两个立板之间距离在一定范围内无级可调.立板设计成几个尺寸可以更换,实现不同高度散热器的测量.
Thermal and flow resistances are two important parameters for the heat sinks used in power semiconductor devices.Design method of a thermal and flow resistances test system for air cooled heat sinks has been introduced in this paper.The maximum size of the test section is 500 mm＆#×250 mm.The size of the test section is adjustable.The maximum speed of air flow is 15 m/s,while the maximum pressure drop of the heat sink being test is 800 Pa.Aerodynamic structure of the wind tunnel is designed as a low speed straight flow type.The power section is placed at the entrance of the tunnel.Following it,they are expansion section,stable section,contraction section,and testing section.The total length of the wind tunnel including test section is 5.2 m.The contraction ratio of the wind tunnel is 5.76.The aerodynamic calculating results show that the energy loss of the wind tunnel is 201 Pa.The input power of the wind tunnel is 1.9 kW.With a drawer-like plate component design,the size of the test section is adjustable.The adjustable plate component is composed with a horizontal plate and two vertical plates, and it is placed in the testing section box.The horizontal and vertical plates are connected by guide slots on the horizontal plate.The distance between the two vertical plates can be varied to any size in a certain range.The vertical plates are designed as several sizes,which makes it possible for measurements of sinks in several different heights.
出处
《测试技术学报》
2015年第1期7-13,共7页
Journal of Test and Measurement Technology
关键词
风冷散热器
热阻
流阻
风洞
试验段
air cooled heat sink
thermal resistance
flow resistance
wind tunnel
test section
