Numerical simulation of steam submerged jet and condensation

Abstract

[Objectives] During the discharging of ship-used steam power,steam jet condensation was a common physical process. In order to fully grasp the fundamental physical phenomena within steam submerged jet and condensation under open space,CFD simulation with Mixture multiphase model was carried out.[Methods] With the experimental results,heat transfer model was modified. Vapor volume fraction 0.95 was regarded as the critical value to measure the length of plume. Spatial distribution of plume,velocity,temperature and pressure fields for steam submerged jet and condensation under different inlet pressure and condensed water temperature conditions were studied.[Results] Simulation results show that different initial state would affect the plume shapes. Within stable steam submerged jet and condensation,a relatively lower temperature area is appeared in the core of plume. Pressure distribution along the axial direction is present in a fluctuating form,verifies the existence of the expand-compress wave inside the plume,amplitude and spatial wavelength of the pressure fluctuation are increased with increasing inlet pressure.[Conclusions] Study in this paper could provide guidance for the optimal design of steam submerged jet and condensation.

Keywords

• submerged jet
• steam plume
• pressure shock
• numerical simulation