A three‐dimensional computational fluid dynamic model of a transpiring wall reactor for supercritical water oxidation has been built to optimize the uniformity of water film. Results show that the temperature and species distributions at the nozzle outlet deviate from the reactor centre. The inner wall of the porous tube near the transpiring water injection tube displays low temperatures, while high temperatures are recorded far from the injection tube. The circumferential temperature distribution on the inner wall of the porous tube is uneven. This phenomenon is due to the uneven injection of the transpiring water, leading to the uneven protection of the water film and local overheating of the porous wall. The injection velocity of the transpiring water significantly decreases when the number of injection tubes is increased, and the circumferential velocity and temperature distributions on the porous wall gradually become even. Moreover, high pressure drops across the porous wall at low porosities are useful for the uniform injection of the transpiring water. This characteristic is also conducive to obtaining a more uniform water film protection.

中文翻译：

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超临界水氧化透壁反应器水膜均匀性研究

建立了超临界水氧化透壁反应器的三维计算流体动力学模型，以优化水膜的均匀性。结果表明，喷嘴出口处的温度和物质分布偏离反应堆中心。靠近喷水管的多孔管内壁显示低温，而远离喷水管则记录到高温。多孔管的内壁上的周向温度分布不均匀。这种现象是由于所喷出的水注入不均匀，导致水膜的保护不均匀以及多孔壁局部过热所致。随着注入管数量的增加，流失水的注入速度会大大降低，多孔壁上的圆周速度和温度分布逐渐变得均匀。此外，在低孔隙率下穿过多孔壁的高压降对于均匀注入渗入水是有用的。该特性也有利于获得更均匀的水膜保护。