Effect of gas reservoir volume on cryogenic loop heat pipes
The gas reservoir volume of a cryogenic loop heat pipe (CLHP) is usually 30 to 100 times the total volume of the other components,and its weight accounts for the largest proportion.To realize the lightweight design of CLHPs and improve the utilization rate of satellite payload resources,research was conducted on the mechanism of the influence of gas reservoir volume on the startup and steady-state operating characteristics of CLHPs.A start-up model and a steady-state failure model of CLHPs were established,and theoretical and experimental validation studies were carried out on the influence of gas reservoir volume on key parameters of the condensation temperature,evaporation temperature of the secondary evaporator and heat transfer thermal resistance.Results showed that,by increasing the design value of the evaporation temperature of the secondary evaporator,the CLHP experimental prototype started up smoothly with a gas reservoir volume only 11 times the total volume of the other components.The effect of different gas reservoir volumes on the heat transfer thermal resistance of CLHPs was negligible when the primary heat load was high.When the volume of the primary compensation chamber was certain,the regulating ability of the primary compensation chamber could be enhanced by decreasing the volume of the gas reservoir,thereby expanding the range of primary heat load for stable operation of the CLHPs.
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