连续和重复频率激光对旋转壳体加热效率的数值模拟
Numerical simulation of heating efficiency comparison of CW laser and repeated frequency laser irradiating rotational shells
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摘要: 基于有效利用激光能量的目的，采用有限元分析方法分析并比较了重复频率和连续激光对旋转壳体的加热效率。数值计算结果表明：重复频率激光要比连续激光的加热效率高，而且加热效率与重复频率、占空比等有关；在平均功率密度相同的前提下，在频率相同条件下，占空比减小，温度上升加快，即加热效率随占空比的减小而增大；在相同占空比条件下，重复频率越小温度周期变化越明显，振荡峰值越大，当占空比较小时随着辐照时间的增加重复频率对加热效率影响减小。Abstract: In order to use the laser energy efficiently, a numerical model is presented to simulate the temperature distribution on the rotational cylindrical shell under CW and repetition frequency laser irradiation . By numerical analyzing, a conclusion is drown that the heating efficiency of laser is affected by repetition frequency and the duty ratio of pulsed laser, and the heating efficiency of pulsed laser is greater than that of CW laser. Temperature rises with the duty ratio decreasing under the same repetition frequency of pulsed laser, while the temperature periodic change is more obvious with the lower repetition frequency under the same duty ratio of pulsed laser. When the duty ratio of pulsed laser is small, repetition frequency has little effect on the heating efficiency of pulsed las
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