Numerical Simulation Study on High-Temperature Ventilated Cavitating Flow Considering the Compressibility of Gases

Abstract

A numerical simulation approach of ventilated cavity considering the compressibility of gases is established in this paper, introducing the gas state equation into the calculation of ventilated supercavitating flow. Based on the comparison of computing results and experimental data, we analyzes the differences between ventilated cavitating flow fields with and without considered the compressibility of gases. The effect of ventilation on the ventilated supercavitating flow field structure is discussed considering the compressibility of gases. The results show that the simulation data of cavity form and resistance, which takes the compressibility of gases into account, accord well with the experimental ones. With the raising of ventilation temperature, the gas fraction in the front cavity and the gas velocity in the cavity increase, and the cavity becomes flat. The resistance becomes lower at high ventilation temperature, but its fluctuation range becomes larger than that at low temperature.

Experimental and numerical study on unsteady entrainment behaviour of ventilated air mass in underwater vehicles

“…Spurk (2004) extended the gas loss theory of ventilated cavities under isothermal conditions to nonisothermal conditions through a theoretical derivation. Zhao et al (2012) further explored the influence of temperature through a numerical method, and found that an increase in the ventilation temperature caused the cavity to become flat and the resistance to decrease, although the fluctuation range was larger than at low temperatures. Lv et al (2021) and Ma et al (2019) explored the unsteady behaviour of ventilated cavities below axisymmetric bodies through numerical approaches, and found that the re-entrant jet was closely related to the unsteady behaviour.…”