Nowadays methane is a fossil fuel widely used both in industries and in civil appliances. From the safety point of view, due to its flammability, its use implies hazards for people and assets. The hazardous area related to a high-pressure jet of methane arising from an accidental loss of containment requires the estimation of the distance at which the methane concentration falls below the Lower Flammability limit. Such a topic is well covered in the literature when considering free jet conditions, i.e., jets that do not interact with any equipment or surface. The same cannot be said for high pressure jets impacting an obstacle. In this context, the present work focuses on studying high pressure methane jets impacting spherical obstacles by means of Computational Fluid Dynamics with the aim of giving some insights about such a jet-obstacle interaction, possibly providing a brief by-hand procedure that, only based on known scenario information, allows to estimate the maximum extent of the unignited high-pressure jet when interacting with a spherical obstacle.

如今，甲烷是一种广泛用于工业和民用电器的化石燃料。从安全的角度来看，由于其易燃性，其使用意味着对人员和资产的危害。与安全壳意外丢失引起的高压甲烷喷射相关的危险区域需要估计甲烷浓度低于可燃性下限的距离。在考虑自由射流条件时，文献中很好地涵盖了这样一个主题，即，不与任何设备或表面相互作用的射流。对于撞击障碍物的高压射流，情况并非如此。在这种情况下，目前的工作重点是通过计算流体动力学研究高压甲烷射流撞击球形障碍物，目的是对这种射流-障碍物相互作用提供一些见解，可能提供一个简短的手工程序，该程序仅基于根据已知的场景信息，可以估计与球形障碍物相互作用时未点燃的高压射流的最大范围。