Experimental investigation of violent liquid slamming pressure in large-scaled tank
Abstract
Structural strength of the cargo containment systems of the very large-scale Floating Liquefied Natural Gas (FLNG) can be damaged by the sloshing-induced slamming load. Large scale sloshing experimental investigation can truly reveal the process of slamming. Due to the compressibility of liquid and gas, slamming load instantaneously increases dramatically. So, accurate measurement of impact pressure is one of key issues in experimental investigation. In order to study the measurement of impact pressure accurately, sensitively and reliably, six-degree of freedom hexapod and large-scale model tank are employed. Not only the impact pressure but also the slamming process are recorded by both membrane and pinhole piezoresisitve sensors. The procedure of liquid slamming on the vertical wall is further provided by the impact occurrence in time domain. Furthermore, the spatial correlation of impact pressure is analyzed by correlation method. The results illustrate that the pinhole sensor is more sensitive to the bubble effect, and the membrane type acts averaging effect. It is reported that the slamming load performs linear correlation both in the vertical and horizontal direction below the impact point. Therefore, it is recommended that pressure sensors should be installed with an array near the impact point in the larges-scaled model test.
