Study On The Feasibility Of A Non-heating Nozzle Made Of Super Engineering Plastics For COIL

Oxygen iodine mixing nozzle is one of key components in chemical oxygen iodine laser. Now it is made of stainless steel.To prevent iodine steam condensing,it must be heated by heater.So this metal nozzle' structure is very complicated and often run into trouble.What's more,it's difficult to machining.This paper will adopt super engineering plastics to machining a non-heating nozzle to figure out the problems of metal nozzle.To validate the new plastic nozzle is feasible and find out the application extension and selection principle of material,this paper selects five sorts of plastic at first,takes example for polyimide,simulates the temperature fields of polyimide nozzle and metal nozzle in same condition of KW chemical oxygen iodine laser.Then it discusses the influence of the main and auxiliary airflow parameters and the material's thermal parameters to the temperature fields of nozzle.Basing on the research,the non-heating plastic nozzle's application extension and selection principle of material are analyzed.Finally,the paper proves the reliability of the simulation data by experiments.Above study indicate four results.Firstly,the new nozzle can prevent the heat dissipation of the iodine steam.So it doesn't need to be heated in use and it has advantage to enhance the total performance of the laser.Secondly,the temperature fields of nozzle is not sensitive to the gas flux and temperature.Therefore,the new nozzle could be applied in higher power laser.Thirdly,the material's thermal conductivity and specific heat have conjunct effects to the temperature fields of nozzle.The material with lower thermal conductivity and higher specific heat is more suitable to machining nozzle.Fourthly,the simulation data are lower than the experiments data in number,which is mainly aroused by the heating effect of the pipeline.But the simulation data accord with the movement trend of the nozzle temperature and could reflect the heat transfer status.The conclusions of the paper testify the feasibility of the non-heating plastic nozzle and support the selection rule of nozzle material,which benefit to optimize the nozzle's structure and improve the nozzle's performance.