阶梯复合形光声池声流特性计算与评估(4)
图11 三种结构光声池频扫结果Fig.11 Frequency scanning results of three photoacoustic cells
3 结论
以圆柱共振型光声池为基础,提出了一种阶梯复合形光声池的设计方案,在验证模拟方法正确的基础上,通过模拟分析对比了设计参数对光声池声-流特性的影响,结果表明:
1)在参数研究范围内,减小阶梯腔半径,光声信号相对增强;阶梯腔长度存在最佳尺寸,使得光声信号达到最强;单阶梯腔结构设计,光声信号相对较好;
2)阶梯复合形光声池改善了缓冲腔与谐振腔之间的截面突变导致的气体涡漩回流情况,流场特性相对较好,进一步对腔内过渡处进行圆角或倒角处理,可使得腔内流速变得更为平稳;
3)在所选参数的条件下,阶梯复合形光声池气体容积降低为圆柱共振型光声池的39.7%,其光声信号相对提升约18.7%,其频响带宽变窄,光声池品质因数得到提升。
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