改进的固定边界上方气泡射流方向判定准则

前人应用开尔文冲量理论得到了判断固定边界上方气泡射流方向的Blake准则,但其预测精度在特定参数范围内不足。为此,通过考虑气泡内压力变化并引入边界效应,提出了改进的气泡射流方向判断准则,使用边界元方法模拟结果对其进行验证,比较了改进模型与传统Blake准则的预测结果,并分析了无量纲强度参数对改进模型预测结果的影响。研究表明,改进的模型比传统Blake准则具有更高的预测精度。改进的理论模型能够为水下爆炸、海底资源勘探等领域提供理论参考。

Modified criteria for jet direction of bubbles above a rigid boundary

The Blake criterion, which determines the bubble jet direction above a rigid boundary, was obtained through the Kelvin impulse theory. However, the theoretical model has lower prediction accuracy under a specific parameter range. Therefore, a modified judgment criterion for the bubble jet direction was proposed by considering pressure variation inside the bubble and introducing the boundary effect. The boundary element method was used to simulate the results and verify them. Meanwhile, the prediction results of the modified model and the traditional Blake criterion were compared, and the influence of dimensionless strength parameters on the prediction results of the modified model was investigated. Results show that the modified model has higher prediction accuracy than the traditional Blake criterion. The modified theoretical model provides a valuable reference for underwater explosion, seabed geophysical exploration, and related fields.