Simulation Study on Performance of 100kW Class Phase Change Thermal Storage and Heat Exchanger for Aircraft
Airborne laser weapons produce hundreds of kilowatts of waste heat during its working process,therefore,foreign research institutions generally adopted phase change thermal storage and heat exchangers to storage the waste heat in a short time and then release it slowly.Based on this,a kind of three-channel plate-fin heat exchanger was proposed to conduct an exploratory research on the international advanced technology of phase change thermal storage and heat exchanger.Then,the performance of main structure parameters of this heat exchanger was analyzed quantitatively by nu-merical simulations.Corresponding to these results,the outlet temperature of hot fluid decreases with the increasing fin height for phase change material channels,and increases when the fin height for fluid channels and fin pitch for all channels grow.In addition,it was found that the internal region of this heat exchanger can be divided as"low-efficiency heat storage zone","high-efficiency heat stor-age zone"and"temperature buffer".To ensure that the hot fluid outlet temperature meets the re-quirement of design throughout this whole period of heat storage,it is necessary to adopt a design of multistage flow paths for this heat exchanger.
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