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本文采用气体辅助雾化喷嘴,以液氨为冷却工质,氮气为辅助气体,研究了高热流密度条件下的氨喷雾相变冷却换热特性,分析了气液配比对换热特性的影响,并与液压式喷嘴喷雾相变冷却换热进行了对比。结果表明:气雾喷嘴在气助力作用下其雾化特性得到较大改善,气、液相配比率对喷雾相变冷却换热特性影响较大;气相流量一定时,随着液相流量增加,热表面温度降低,临界热流密度值增大。当实验工况维持不变时,热流密度为280 W/cm~2时,氮气雾化喷嘴换热系数可达儿3717 W/(m~2·K),比液压式提高了69%。
In this paper, gas-assisted atomization nozzle was used to study the heat transfer characteristics of phase change cooling with ammonia spray under the condition of high heat flux, using liquid ammonia as cooling medium and nitrogen as auxiliary gas, and the influence of gas-liquid ratio on heat transfer characteristics was analyzed , And compared with the hydraulic nozzle spray phase change cooling heat exchange. The results show that the atomization characteristics of the aerosol nozzle are greatly improved under the gas-assist force, and the ratio of the gas-liquid phase has a great influence on the heat transfer characteristics of the spray phase-change cooling. When the gas phase flow rate is constant, The hot surface temperature decreases and the critical heat flux density increases. When the experimental conditions remain the same, the heat transfer coefficient of nitrogen atomization nozzle can reach 3717 W / (m ~ 2 · K) when the heat flux is 280 W / cm ~ 2, which is 69% higher than that of hydraulic pressure.