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摘要 ：以大空间空调设计中广泛采用的圆形喷口为例，对比分析了传统半经验射流理论计算结果与CFD模拟结果。研究结果表明，模拟得到的多喷口水平并排射流的射流轴心弯曲及轴心风速衰减均较快；实际建筑空间结构、内部发热条件及喷口布置形式对射流的流场有较大影响；空间温度场分布并非仅与射流的射程有关，还受空间整体气流状况影响。 关键词 ：圆形喷口,非等温射流,自由射流,空调,大空间 Study of the applicability of jet theory for large space air conditioning By Zhou Zhiren★, Tan Hongwei and Pan Dongmei Abstract：Taking round nozzle as example, compares the results obtained by semi?empirical formulas and those by CFD method. The research results indicate that the axes bend and the velocity decrease of the jet obtained by CFD method are more quick for parallel horizontal jet with multiple nozzles, and that the space size, interior thermal conditions and nozzle layout have obvious effect on jet distance, and that the interior temperature distribution is affected by the jet distance and the whole air distribution. Keywords：round nozzle, non?isothermal jet, free jet, air conditioning, large space ★China Academy of Building Research, Shanghai Branch, Shanghai, China