氧碘化学激光器分别采用二次喉道扩压器和8°扩压器时,对在不同阀门开度下的气流方向的壁面静压曲线和背压曲线,光轴壁面静压曲线,出口总压与上游压比值曲线,输出功率曲线进行了测量.对两种扩压器的数据进行了对比,结果表明:与8°扩压器相比,二次喉道扩压器能够有效隔离扩压器下游气流对光腔的干扰,显著减小捩区长度,并将转捩区控制在扩压器内.在激光器背压升高时,二次喉道扩压器的稳定性更强.

A secondary-throat diffuser and an 8°diffuser are used respectively on COIL.The performance parameters of the two diffusers are measured and compared.The result indicates that the secondary-throat diffuser may effectively insulate the flow disarrangement from the diffuser,avoid the down-stream flow disarrangement into the optical resonator,improve the stability of static-pressure in resonator,and enhance the stability of the output power of COIL.The secondary-throat diffuser is propitious to COIL at high back-pressure.