Abstract:This study optimized the previously established low-pressure chemical vapor deposition (CVD) model for tungsten, enabling its application under atmospheric pressure conditions to deposit high-performance coatings on the surface of rocket engine throat liners. The effects of three distinct reactor configurations, including a straight-tube inlet, an integrated gas distribution device, and a combination of a distribution device with a flow guide baffle, on the flow dynamics, thermal field, species concentration, and deposition kinetics of reactors were investigated. Numerical and experimental results demonstrate that the configuration incorporating both a distribution device and a baffle eliminates vortices within the liner region by promoting radial gas diffusion, thereby significantly improving flow field uniformity. This optimized design not only improves the uniformity of the deposition rate on the throat insert, but also slightly enhances the service efficiency of tungsten hexafluoride. This work provides a theoretical foundation for designing CVD systems for highly uniform tungsten coatings and offers a practical solution for their engineering application.