摘要
采用CFD方法对压缩空气吹除主压载水舱过程进行仿真,同时开展水舱吹除等比模型试验,验证了两种湍流模型的预报准确性。在此基础上,着重研究水舱气液两相流动过程以及舱内气体压力动态变化特性,分析气源压力、通海孔面积对吹除的影响。研究发现:两种湍流模型均可以较好地预测水舱吹除过程,其中,Realizable k-ε模型对气瓶气体压力的预测与试验吻合更好;SST k-ω模型对于水舱中气体压力的预测与试验相对较为接近。通海孔面积增加可以显著减弱水舱气体积压,在气源压力为2.16 MPa、5.04 MPa和8.16 MPa时,通海孔面积增大5.14倍,试验测得的水舱峰压分别减少51.13%、59.90%和64.82%,仿真得到的水舱峰压分别减少50.44%、57.30%和60.02%。在吹除后期,有压缩空气从通海孔溢出,舱内气体压力迅速下降,可以此作为解除吹除的判据。
The process of compressed air blowing main ballast tank was simulated by CFD method, and an equal scale model test was carried out to verify the prediction accuracy of two turbulence models. On this basis, the air-liquid two-phase flow process and the dynamic variation characteristics of air pressure in main ballast tank were studied emphatically, and the effects of air source pressure and sea opening area on the blowing were analyzed. It is found that both turbulence models can well predict the blowing process, among which, the prediction of air pressure in bottle by Realizable k-ε model is more consistent with the test results while the prediction of air pressure in main ballast tank by SST k-ω model is relatively close to the test results. The increase of sea opening area can significantly reduce the accumulated air pressure in main ballast tank. When the air source pressure is 2.16 MPa, 5.04 MPa and 8.16 MPa, the sea opening area increases by5.14 times, the peak pressure of air in main ballast tank measured by the test decreases by 51.13%, 59.90%and 64.82% respectively, and the peak pressure of air obtained by simulation decreases by 50.44%, 57.30%and 60.02% respectively. In the later stage of blowing, the compressed air overflows from the sea opening,and the air pressure in the main ballast tank drops rapidly, which can be used as the criterion to stop blowing.
作者
羿琦
林博群
张万良
陈硕
邹文天
张康
YI Qi;LIN Bo-qun;ZHANG Wan-liang;CHEN Shuo;ZOU Wen-tian;ZHANG Kang(State Key Laboratory of Deepsea Manned Vehicles,China Ship Scientific Research Center,Wuxi 214082,China;Taihu Laboratory of Deepsea Technological Science,W uxi 214082,China;W uxi Diesel Engine Works,FAW Jiefang Automotive Co.,Ltd.,Wuxi 214026,China)
出处
《船舶力学》
EI
CSCD
北大核心
2023年第2期218-226,共9页
Journal of Ship Mechanics
基金
江苏省自然科学基金项目(BK20200165)。
关键词
VOF方法
主压载水舱
通海孔
水舱峰压
VOF method
main ballast tank
sea opening
peak pressure of air in main ballast tank
