关键词: 液体推进剂火箭发动机;喷管;再生冷却;温度分布;数值计算

Abstract: To understand heat transfer characteristics of regenerative cooling in round to square nozzle (RS nozzle), numerical simulation was employed. Governing equations for hot gas, solid wall and coolant were established respectively, and coupled calculation of flow and heat transfer was carried out. Flowfield and temperature field in RS nozzle were obtained. Results showed: (1)In divergent segment after transforming to square, if contour was not smooth, there would be a compression wave, which raised temperature and heat flux in gas wall and made this place become a dangerous segment. (2)Temperature in unsmooth wall was higher than that in smooth wall, which made temperature distribution along circumference un-uniform. (3)Ribs and highly conductive copper alloy strengthened heat transfer in cooling channel, and made temperature near rib lower than that near cooling channel bottom.

Key words: Liquid propellant rocket engines;Nozzle;Regenerative cooling;Temperature distribution;Numerical calculation