Numerical Simulation Of Coil Heat Exchanger In Compact Fast-axial-flow CO₂Laser

A higher power, smaller and compact structure are the development trend of fast axialflow （FAF） CO₂laser, especially in the Airborne large-format laser.In order to increase theoutput power, one of effective ways is to combine RF excitation and the Turbine with largeflow.In this case, the exploration of more compact structure and adapted heat exchanger isvery important to the FAF CO₂laser.The contents of the paper are arranged as follows:（1）The blower type has been selected, and the means of heat exchange have beenconfirmed, according to the overall structure of the new high power FAF CO₂laser. Theturbine with large flow and high compression ratio and the coil heat exchanger are the bestchoice to meet the compact structure of high power FAF CO₂laser.（2）A numerical model of coil exchanger has been established based on FLUENT, forthe selected large flow Turbine and the corresponding heat exchanger. The simulationcalculation of the designed heat exchanger has been carried out. Pressure, velocity andtemperature distribution have been obtained.The result shows that the total heat transfercapacity of the designed exchanger can upto44kW, which can indicate that the coil heatexchanger is suitable to the FAF CO₂laser we have designed.From this thesis, according to numerical simulation of coil heat exchanger in the laserwith symmetric compact structure, the main parameter distributions have been obtained. Itprovides a data support for the optimization and improvement of the exchanger. Also, it isuseful for the development of a smaller and higher power FAF CO₂laser.