The objective of this study is to analyze the compressibility effects of multiphase cavitating flow during the water-entry process. For this purpose, the water-entry of a projectile at transonic speed is investigated computationally. A temperature-adjusted Tait equation is used to describe the compressibility effects in water, and air and vapor are treated as ideal gases. First, the computational methodology is validated by comparing the simulation results with the experimental measurements of drag coefficient and the theoretical results of cavity shape. Second, based on the computational methodology, the hydrodynamic characteristics of flow are investigated. After analyzing the cavitating flow in compressible and incompressible fluids, the characteristics under compressible conditions are focused upon. The results show that the compressibility effects play a significant role in the development of cavitation and the pressure inside the cavity. More specifically, the drag coefficient and cavity size tend to be larger in the compressible case than those in the incompressible case. Furthermore, the influence of entry velocities on the hydrodynamic characteristics is investigated to provide an insight into the compressibility effects on cavitating flow. The results show that the drag coefficient and the impact pressure vary with the entry velocity, and the prediction formulas for drag coefficient and impact pressure are established respectively in the present study. Keywords: High-speed, Water-entry, Compressibility, Cavitation, Multiphase flow


    Access

    Download


    Export, share and cite



    Title :

    Computational analysis of compressibility effects on cavity dynamics in high-speed water-entry


    Contributors:
    Chen Chen (author) / Tiezhi Sun (author) / Yingjie Wei (author) / Cong Wang (author)


    Publication date :

    2019




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown




    High-Speed Deflagration with Compressibility Effects

    Soloukhin, R. I. / Oppenheim, A. K. / Manson, N. et al. | AIAA | 1985


    Effects of compressibility on high speed flight

    Stack, J. | Engineering Index Backfile | 1934


    Numerical simulation of high-speed water-entry cavity of cone cylinder

    Qingpeng, M. / Yingjie, W. / Cong, W. et al. | British Library Online Contents | 2014