CAJ | 학술논문

含气空泡在出水过程中会发生溃灭，形成较为复杂且剧烈变化的流场。首先基于含气理想球形空泡溃灭模型，理论上分析了空泡溃灭特性，而后基于均质多相流模型，对航行体出水过程中含气空泡溃灭现象进行了数值模拟分析。计算分析表明，含气空泡溃灭过程存在回弹现象，会在航行体表面形成冲击载荷，空泡内压提高使空泡尺度增大并且可在一定程度上减小空泡内外压差，缓解由空泡周围流体强烈拍击航行体壁面而产生的压力激励。
함기공포재출수과정중회발생궤멸，형성교위복잡차극렬변화적류장。수선기우함기이상구형공포궤멸모형，이론상분석료공포궤멸특성，이후기우균질다상류모형，대항행체출수과정중함기공포궤멸현상진행료수치모의분석。계산분석표명，함기공포궤멸과정존재회탄현상，회재항행체표면형성충격재하，공포내압제고사공포척도증대병차가재일정정도상감소공포내외압차，완해유공포주위류체강렬박격항행체벽면이산생적압력격려。
The cavity mixed with air will collapse during water exit,which leads to a dramatic change of flow field. The cavity collapse property was analyzed by using a spherical air-involved bubble model.Then,based on the homogenous multiphase flow model,the numerical simulation of the cavity collapse filled with air was conducted.The result shows that the rebound phenomenon will occur in the cavity water exit collapse process,and cause strong impact on vehicle surface. The analysis also presents that the rising of cavity's inside pressure causes the growing of cavity size and reduces the inside and outside pressure difference,which eases the water impact.