基于多场耦合的无线电侦扰一体主机散热特性分析

Analysis of heat dissipation characteristics of the integrated host for radio detection-interference based on multi-field coupling

针对无线电侦扰一体主机因高度集成引起的高热流密度导致散热难的问题,通过分析整机的散热路径,构建传热网络图;应用传热学和流体力学理论,建立主机热−流−固耦合散热数学模型;基于ANSYS Icepak仿真平台,构建主机的三维全尺寸数值模型研究其散热特性。结果表明:当风扇风量约为56 m^(3)/h时,无线电侦扰一体主机的散热性能较好且噪声较小;当电源箱的热源同侧分布,侦扰箱和导航诱骗箱的热源异侧分布,且热源靠近进风口或出风口时,主机的散热性能好且效率高;当支架孔隙和设备间距分别为15 mm和10 mm时,主机的散热性能较好且结构强度高,同时主机质量和体积均较小;当散热器翅片的高度、厚度和间距分别为7.5 mm、1 mm和5 mm时,强化散热效果较好且主机质量小。

Aiming at the difficulty of heat dissipation caused by high heat flux induced by high integration of the integrated host for radio detection-interference,a heat transfer network was constructed by analyzing the heat dissipation path of the host.Based on the theories of heat transfer and fluid mechanics,a mathematical model for thermal-fluid-solid coupled heat dissipation of the host was established.The ANSYS Icepak simulation platform was applied to create a three-dimensional full-scale numerical model for the host to study its heat dissipation mechanism.The results show that when the fan air volume is 56 m^(3)/h,the integrated radio detectioninterference host has good heat dissipation and low noise.When the heat sources of the power box are distributed on the same side,meanwhile the heat sources of the disturbance box and the navigation deception box are distributed on different sides,and the heat sources are close either to the air inlet or to the air outlet,the heat dissipation performance of the host is good with high efficiency.When the beam spacing of the bracket and device spacing are 15 mm and 10 mm respectively,the host has good heat dissipation performance and high structural strength with small mass and volume.When the height,thickness and spacing of the radiator fins are 7.5 mm,1 mm and 5 mm,respectively,the heat dissipation is enhanced with light weight host.