拉伐尔喷管（de Laval nozzle, 亦称渐缩渐阔喷管，convergent-divergent nozzle、CD nozzle或con-di nozzle）是一个中间收缩、不对称沙漏状的管子。借由将流体的热能转化为动能，可将通过它的热压缩气体加速到超音速。气体在截面积最小处恰好达到音速。被广泛用作蒸汽涡轮机及火箭发动机喷管，亦可见于超音速喷气发动机。类似的流动性质已经应用于天体物理学中的喷射流。
利用这些结果得到了二元拉伐尔喷管内不可压缩位势流动的精确解。
Making use of these results, we obtained an exact solution for the incompressible potential flow through a two-dimensional Laval nozzle.
本文介绍了我国第一台用以研究过饱和水蒸汽自发凝结现象的拉伐尔喷管试验装置。
This paper introduces an experimental Laval nozzle apparatus which is the first one of its kind developed in China and used to study the spontaneous condensation phenomena of the supersaturated steam.
这种方法以拉伐尔喷管内非对称流动理论为基础，首先着眼于减少气动偏心，然后考虑效率。
The method, based on the theory of non-symmetric flow in Lavol nozzle, aims first at the Angle of reducing the gas dynamic misalignment, and then at the Angle of efficiency.
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