两管燃烧器在生长室内燃烧特性的数值模拟

Numerical Simulation of Combustion Characteristics of Two Tube Burner in Growth Chamber

通过研究两管燃烧器在生长室内的燃烧特性,分析了燃烧器结构对燃烧特性的影响。结果表明:中心O2达到晶体熔帽上表面时,沿着熔帽表面向外流动,与晶体周围的H2发生反应,放出大量的热能,易使晶体熔帽边缘温度过高而引起溢流现象的发生;喷嘴中O2孔降低,不仅使晶体熔帽的边缘温度升高,而且大幅度增大了熔帽中心的压力,造成晶体熔帽产生较大的变形量,容易引起晶体在生长过程中发生溢流现象。

Combustion characteristics of two tube burner in growth chamber for preparation of single crystal with flame fusion method were investigated,and the effects of nozzle structure on combustions characteristics were analyzed.The results show that the central oxygen flows outward along the radial direction and reacts to hydrogen surrounding crystal when it reaches the surface of the melted cap of crystal,which leads to increasing the temperature of the edge of crystal and is easy to cause the overflow of the melted cap of crystal.The pressure of the melted cap of crystal is mainly derived from the central oxygen flow,and the maximal pressure of center and edge of melted cap is compressive and tensile.