中文摘要：

为探讨制备炭／炭复合材料等温化学气相渗透工艺渗透过程，用Navier—Stokes方程耦合Brinkman方程成功地模拟了混合前驱体在沉积炉内流场。分析了该流场的特征，讨论了流场与沉积炉入口尺寸和初始流速的关系。为保证混合前驱体在自由流动空间内为层流，当入口尺寸为0．01m时，初始速度应该为0．4m／s。

英文摘要：

In order to study the isothermal chemical vapor infiltration （ICVI） progress for manufacturing Carbon/Carbon （C/C） composites, the flow field of mixed precursor gas has been successfully simulated based on Navier-Stokes equation in the gas flowing chamber coupling with Brinkman equation in the porous preform domain. The distribution of velocity for the mixed precursor gas in reactor has been fully studied according to the simulation results. The relationship between the flow field and initial velocity at the inlet of the reactor, the interstitial size （the distance between the surface of the preform and the wall of reactor） has been discussed, the laminar flow can be obtained in the gas flowing chamber as the initial velocity 0.4 rn/s is critical velocity in the case of the constant interstitial size 0.01 m.