艉板式与浸没式喷水推进器尾迹脉动压力试验研究

An Experimental Study on Wake Dynamic Pressure of Stern-plate and Immersed Water-jet Propulsion

喷水推进器的喷射流尾迹对船舶隐身特性造成不利影响,目前缺乏喷水推进船舶喷射流尾迹的测试方法及特性研究。本研究搭建了喷水推进船舶尾迹脉动压力测试试验台,分别对艉板式与浸没式推进器喷射流尾迹开展脉动压力测试,基于不同测点位置、不同航行状态下的尾迹脉动压力频谱结果,对比了艉板式喷水推进器和浸没式喷水推进器的尾迹频率与振幅特性,并基于HHT方法细致分析了航行状态下的喷射流尾迹发展规律。发现在靠近水面的浅水位置,相较浸没式推进器,艉板式推进器的喷射流入水显著增强尾迹强度和影响范围,而在深水位置,喷射流强度整体差异不大。此外,在航行状态下,由艉板式推进器喷射流引起的波浪强度也明显高于浸没式推进器,结论为浸没式喷水推进技术发展与推广应用奠定了基础。

The jet wake of water-jet propulsion has adverse effects on the stealth characteristics of ships.There is a lack of study on testing methods and wake feature of the water-jet ships.This study established a testing bench for measuring the dynamic pressure in the wake of a water-jet ship model.Based on the spectrums of dynamic pressure under different positions and navigation states,the wake features of the stern-plate water-jet propulsion and the immersed water-jet propulsion are compared.The evolution mechanism of the jet wake under navigation conditions are analyzed.It is found that the injection of the jet wake of the stern-plate propulsion significantly enhances the wake strength.Moreover,the dynamic pressure of the wake induced by the stern-plated propulsion is also more strong than the immersed propulsion.