Numerical simulation on air age in manned spacecraft cabins

Develops a physical model of manned spacecraft cabin which contains astronauts, apparatus and simple living installations, and numerically simulates the air age distribution in workplaces by use of a zero-equation turbulence model. Air is supplied by air outlets installed in the two top corners with 45 degree, and air outlets are collocated with continuous symmetry, alternative symmetry and alternative stagger modes. Simulation results show that bifurcation phenomenon would appear at continuous symmetry mode and this mode is not recommended, that the alternative stagger mode is better than the alternative symmetry mode and when outlet air velocity is about 1.1m/s the air exchange efficiency is the highest, and that if astronauts work near cabin wall for longer time, the air age around them would be older and a personalized ventilation system is recommended.