A Numerical Simulation on the Transient Flow of Gas-steam Mixture in a Canister

Abstract

The main objective of this research work is to analyze the complicated two-dimensional and three-dimensional flow structure created by the hot jet impingement on the canister walls and predict the pressure, velocity and temperature distribution inside a canister. These flow features inside the canister are mainly caused by the compressible flow. In this research work, a single and two-phase model is proposed in which the working fluid is taken as hot air (1,200 K) at an ideal gas state and a mixture of air and water vapor respectively. In order to examine the flow physics inside a canister for a single and two-phase model, the computer numerical simulation with two-equation standard k-ε and two equation SST turbulence model with the combination of discrete phase model is used respectively. The accumulation of the hot air and a mixture of hot air with water vapor inside a canister develops into the pressurization which may cause the missile to lift and force it out from the canister. The entrance of the working fluid for both the cases inclines to the canister at an angle of 45° to prevent the direct jet-impinging in the sidewalls. The computational results with the turbulence models mentioned fairly well predict the pressure, velocity and temperature distribution in the canister.