Abstract: In order to study the altitude compensation effect of the expansion-deflection nozzle，the work. ing condition at different height of annular throat expansion-deflection nozzle(ATEDN)and the discrete throat expansion-deflection nozzle(DTEDN)were calculated by CFD method. The result shows that in the height range of 0km～15km，two kinds of expansion-deflection nozzles automaticly have ability of compensation，and better than the traditional nozzle. The operating mode is converted from the low altitude‘open’mode to the‘closed’ mode. The performance of ATEDN is better than DTEDN. For the ATEDN，the optimal angel of cone tail angel， convergent angle and initial angle is 70°，5°and 65° respectively，and the convergent angle has no obvious influ. ence on the performance of the nozzle. For the DTEDN，the specific impulse integration of height of the nozzlewith 6 throats is 1.94% more than that of nozzle with 4 throats. The specific impulse integration of height of DT.EDN which uses zonal holes is 3.47% more than which uses circular holes.

Key words: Expansion-deflection nozzle；Altitude compensation；Numerical simulation；Working mode

摘要： 为了研究膨胀偏流喷管高度补偿性能，采用 CFD方法，对环喉式( ATEDN)和分散式

关键词: 膨胀偏流喷管；高度补偿；数值模拟；工作模态