CAJ | 학술논문

采用实验测量与数值模拟相结合的方法研究了切向表面气流环境中激光对薄铝板的辐照效应。实验结果表明：相同速度的氮气流和空气流中，铝板温度曲线相似，说明对于铝这种材料而言，空气流的氧化烧蚀几乎不能进行。无切向气流时，辐照过程中相同时刻铝板的温升及铝板达到的最高温度都高于氮气流和空气流情形。三种环境中，铝板中心位移的变化趋势同温度的变化趋势相同，说明激光加热产生的热应力是铝板形变的主要原因，切向气流不起主导作用。利用有限元分析软件ANSYS数值模拟了铝板温度场及形变的演化过程，分析了激光功率分布和对流换热对结果的影响，数值模拟结果同实验符合地较好。研究结果表明：在较低激光功率密度条件下，切向气流主要通过对流换热对铝板起冷却作用，尤其在激光辐照停止后的降温阶段，其作用更加明显。
채용실험측량여수치모의상결합적방법연구료절향표면기류배경중격광대박려판적복조효응。실험결과표명：상동속도적담기류화공기류중，려판온도곡선상사，설명대우려저충재료이언，공기류적양화소식궤호불능진행。무절향기류시，복조과정중상동시각려판적온승급려판체도적최고온도도고우담기류화공기류정형。삼충배경중，려판중심위이적변화추세동온도적변화추세상동，설명격광가열산생적열응력시려판형변적주요원인，절향기류불기주도작용。이용유한원분석연건ANSYS수치모의료려판온도장급형변적연화과정，분석료격광공솔분포화대류환열대결과적영향，수치모의결과동실험부합지교호。연구결과표명：재교저격광공솔밀도조건하，절향기류주요통과대류환열대려판기냉각작용，우기재격광복조정지후적강온계단，기작용경가명현。
Experiments and simulations were performed to study the laser irradiation effects on thin aluminum alloy sheet in different tangential flow. The temperature traces of the aluminum alloy sheet in the nitrogen flow and air flow were consistent, which indicated that the combustion effect could hardly progress. The temperature of aluminum alloy sheet without flow was higher than those in the nitrogen flow and air flow at the same time. The center displacements traces of the aluminum alloy sheet in three different gas flows kept same shape with corresponding temperature traces, which implied that the tangential flow did not play a dominant role compared with the heat distortion induced by laser heating. Moreover, a numerical model was developed, with finite element analysis software ANSYS, to simulate the process of temperature and displacement of the aluminum alloy sheet in different gas flow and analysis how the power distribution and convection heat transfer impact the results was performed. The computed results present good agreements with experiment data. The results show that the tangential flow mainly take on cooling effect when the power density of laser is not high, especially in the cooling period when the laser irradiation ends.