产品概述
文丘里喷嘴（Venturi Nozzle）
文丘里喷嘴的截面形状为轴对称，由圆弧廓形的收缩段、圆柱形喉部（throat）、扩散段构成。上游面与 ISA 1932 喷嘴相同。喉部由与 ISA 1932 喷嘴相同的长度 0.3d 的 E 部分和长度 0.4d ~ 0.45d 的 E′ 部分组成。
喉部直径 d 取在轴向平面内以近似相等角度分布的至少 4 个直径测量值的平均值。喉部须为圆柱形，任一截面的直径与平均直径的偏差不得超过 0.05%。扩散段与喉部的 E 部分连接处不作圆弧过渡，但须去除毛刺（burr）。
扩散段的夹角 Φ 在 30° 以下，文丘里喷嘴可按与经典文丘里管相同的方式截短（truncate）。
English description
The profile of the Venturi nozzle is axisymmetric. It consists of a convergent section, with a rounded profile, a cylindrical throat and a divergent. The upstream face is identical with that of an ISA 1932 nozzle. The Throat consists of a part E of length 0.3d which is the same as for the ISA 1932 nozzle and a part E' of a length 0.4d to 0.45d. The value d of the diameter of the throat shall be taken as the mean of measurements of at least four diameters distributed in axial planes and at approximately equal angles to each other. The throat shall be cylindrical. No diameter of any cross-section shall differ by more than 0.05% from the value of the mean diameter. This requirement is considered as satisfied when the deviations in the length of any of the measured diameters comply with the said requirement in respect of deviation from the mean. The divergent section shall be connected with the part E of the throat without a rounded part, but any burrs shall be removed. The included angle of the divergent section, Φ, shall be less than or equal to 30°. The Venturi nozzle may be truncated in the same way as the classical venturi tube.
