摘要
为研究空心充钠气门腔体结构对气门传热效果的影响,利用分析软件建立了填充50%液态金属钠的某型号空心气门腔体VOF两相流的3D数值模型,对头部锥角在0～30°内变化时腔体内液态钠的振荡运动和温度场进行了仿真分析。结果表明:空心充钠气门腔体头部锥角对腔体内液态钠的振荡传热影响较大,当锥角在20°以内时,腔体内部液态钠可保持良好的振荡传热特性,且在15°左右振荡传热效果较好,当锥角大于25°时腔体内液态钠的振荡传热效果减弱。通过流动性实验对不同头部锥角的腔体内液态钠的运动状态进行了验证。
To study the influence of cavity structure of the sodium-filled hollow valve on the heat transfer characteristics,a two-phase flow 3 D numerical model of a hollow valve cavity,filled with 50% liquid sodium,is established. Simulationson the oscillation and the temperature gradient of the liquid sodium inside the cavity are performed,when the head cone angle varied from 0°to 30°. The results show that the head cone angle has a great impacton the heat transfer effect of liquid sodium in the cavity. When the head cone angle is smaller than 20 °,liquid sodium in the cavity maintains good oscillatory heat transfer characteristics,15 °makes the best performance. When the angle is larger than 25 °,the oscillation heat transfer effect is poor. Mobility test investigates the movement of liquid sodium in cavities with various head cone angles.
关键词
空心气门
腔体结构
振荡传热
数值分析
hollow valve
cavIty structure
oscillation heat transfer
numerical analysis
