任意长度喷管型面设计方法在气动激光器喷管设计中的应用
Application of arbitrary length nozzle design method to gasdynamic laser nozzle design
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摘要: 将一种新的任意长度喷管型面设计（ALN）方法应用于气动激光器喷管型面设计，在相同的喷管出口设计马赫数、喷管喉部高度及喷管扩张段长度条件下，设计了4条ALN方法喷管型面，并和一条最短长度（MLN）喷管型面作对比，采用2维气动激光器增益场仿真方法对5个喷管的小信号增益场进行仿真。计算结果表明:ALN方法可以有效地实现增益场分布的控制，选择合理的设计参数得到的喷管长度比MLN喷管更短，小信号增益更大。Abstract: An arbitrary length nozzle design method(ALN method) is applied to the nozzle design of a gasdynamic laser. For comparison, four ALN nozzles and one MLN nozzle (designed by minimum length nozzle design method) are designed with the same Mach number on nozzle exit plane, the same height of nozzle throat and the same length of nozzle. Two-dimensional small signal gain(SSG) field simulation is carried out for the five nozzles and the simulation results indicate that the ALN method can control the SSG field distribution of nozzle effectively. ALN nozzles with proper design parameters can obtain shorter nozzle length and bigger SSG than MLN nozzles.
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