Experimental investigation on thermal response of stiffened panel under high-temperature gas leakage

Abstract

High-temperature gas is widely used in ship power systems. As service time increases, pipeline damage will lead to high-temperature gas leakage which will cause structural expansion. The surrounding constraint will prevent the expansion resulting in thermal stress threatening the safety of the hull structure. There is limited research focusing on the impact of high-temperature gas leakage on the thermal response of structures. It is a complex fluid-structure coupling problem that should consider the gas diffusion, structural heat absorption and expansion to simulate the realistic gas leakage scenario. In this paper, to investigate the thermal response of stiffened panel under the action of high-temperature gas, a set of experimental equipment including a steam generation module, a stiffened panel and a signal acquisition module is designed. The effects of high temperature, leakage distance and leakage pressure on the thermal response of panel are investigated. The results show that the high-temperature gas will significantly amplify the stress response of the panel. The center of the panel which is directly opposite to the leakage hole shows an obvious impact effect. The leakage pressure affects the temperature distribution little and mainly influences the stress and displacement. The leakage distance has an effect on the temperature, stress and deformation distribution simultaneously. With the increase of the leakage distance, the extreme temperature, stress and displacement will reduce. The results can deepen the understanding of the mechanism of high-temperature gas leakage on structural thermal response and provide certain guidance to the numerical simulation and hull structural design.