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Numerical study of the effect of ship attitude on the perform of ship with air injection in bottom cavity

机译：船舶姿态对底腔注气船舶性能影响的数值研究

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摘要

Air lubrication by means of a bottom cavity is a promising way for ship drag reduction. The characteristics of air layer under the bottom cavity and effect of drag reduction are sensitive to the attitude of ship model. To investigate the stability of air layer under different navigation condition of air cavity ship, a method with the combination of BANS equations and VOF model is proposed for the viscous-flow calculation of a large flat bottom ship, which is verified by the model-test result. The effect of heeling and trim on the formation and stability of air layer is investigated. Present numerical results show that there is a critical value of heeling arctan(h/B-c) with the definition the cavity depth and width of the h/B-c. The air layer would be stable if ship heeling is less than the critical value. The air layer broke when the heeling is greater than the critical value, and heeling increase, broken phenomenon aggravate. The trim angle of the ship is unfavorable to the stability of the air layer and it should be avoided as much as possible in the course of navigation.
机译：通过底部空腔进行空气润滑是减少船舶阻力的一种有前途的方法。底部空腔下方空气层的特性和减阻效果对船舶模型的姿态很敏感。为了研究空舱船在不同航行条件下空气层的稳定性，提出了一种结合BANS方程和VOF模型的大型平底船粘性流计算方法，并通过模型试验进行了验证。结果。研究了横倾和修整对空气层形成和稳定性的影响。目前的数值结果表明，在定义腔深度和h / B-c的宽度时，存在一个临界值arctan（h / B-c）。如果船后倾角小于临界值，则空气层将保持稳定。当横倾大于临界值时，空气层破裂，并且横倾增加，破裂现象加剧。船的纵倾角不利于空气层的稳定性，在航行过程中应尽可能避免。

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  • 来源
    《Ocean Engineering》 |2019年第15期|106119.1-106119.8|共8页
  • 作者

    Hao Wu;

  • 作者单位

    Wuhan Univ Technol Key Lab High Performance Ship Technol Wuhan 430063 Hubei Peoples R China|Wuhan Univ Technol Sch Transportat Wuhan 430063 Hubei Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Air cavity ship; Drag reduction; Shape of air layer; Heeling; Trim;

    机译：空洞船;减阻;空气层形状;脚跟修剪;

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