It is important to study the characteristics of the nozzle of the deluge spray to comply with the standards developed by the petroleum industry for offshore installations in Norway. Due to the stochastic nature of the decomposition processes and geometrical features within the nozzle, the deluge spray has a complex flow field. Since the flow field determines the performance of the spray, the present study performs an experimental characterization of a medium velocity deluge nozzle for validation of computational fluid dynamics (CFD) models. The experiment was conducted for a maximum supply water pressure of 8.0 bar (g), which is identical to the operating pressures of offshore installations. Formerly, characterization studies of deluge or sprinkler spray were mostly targeted on residential usage with lower supply water pressures. I utilized a laser-based shadow imaging system to capture high-speed images, which were later processed in MATLAB. A linear patternator was used to validate the results of the shadow imaging technique. The geometrical features of the deluge nozzle played an important role in determining the characteristics of the spray. In addition, the supply water pressure significantly affected the size and velocity distributions of the droplets, applied density (volume flux), and area coverage. However, the Sauter mean diameter did not vary significantly with the azimuthal or radial position of the droplet within the inner region of the spray. The measurements obtained in this study can be used to estimate the extinguishing efficiency of a deluge system for offshore installations with elevated supply water pressures. Deviations between measurements with shadow imaging and patternator technique are discussed and discrepancies are discussed.

重要的是要研究洪水喷头的喷嘴特性，以符合石油工业为挪威海上设施开发的标准。由于分解过程的随机性和喷嘴内的几何特征，暴雨喷雾具有复杂的流场。由于流场决定了喷雾的性能，因此本研究对中速雨淋喷嘴进行了实验表征，以验证计算流体动力学（CFD）模型。在最大供水压力为8.0 bar（g）的情况下进行了该实验，该压力与海上设施的工作压力相同。以前，雨水或洒水喷头的特性研究主要针对供水压力较低的住宅用途。我利用基于激光的阴影成像系统捕获高速图像，然后在MATLAB中对其进行处理。使用线性图案形成器来验证阴影成像技术的结果。喷淋头的几何特征在确定喷雾特性方面起着重要作用。此外，供水压力显着影响液滴的大小和速度分布，施加的密度（体积通量）和面积覆盖率。但是，索特的平均直径在喷雾内部区域内不会随着液滴的方位角或径向位置而显着变化。在这项研究中获得的测量结果可用于估计供水压力升高的海上设施的洪水系统的灭火效率。