强制偏流喷管的实验研究

AN EXPERIMENTAL RESEARCH ON FORCED DEFLECTION NOZZLES

关键词:  固体推进剂火箭发动机  整体结构  特型喷管  喷管气流  实验

Key words:  Solid propellant rocket engine  Integrated structure  unconventional nozzle  Nozzle gas flow  Experimentation

摘要:

介绍了整体级概念及强制偏流喷管，分析了喷管内的流场与外界压力变化的关系。在实验参数相同的条件下进行了与普通锥形喷管的对比实验，并测定了在发动机工作过程中扩散段的压力变化。结果表明，该喷管具有良好的推力性能和自动补偿外界压力变化的能力。

Abstract:

The integrated stage concept(ISC) with forced deflection nozzle (FDN) is introduced first, the working process for this nozzle at different outlet pressures is analysed. The experiments include:1)The tests compared with the conventional nozzle. On the conditions of same throat areas and same exit areas, the thrusts of the two kinds of nozzles are measured, the results’that the total impulses of the two kinds of nozzles are equal approximately can confirm that the forced deflection nozzle is feasible;2) The pressure tests. Three points in the exit cone wall and one point in the plug base are taken to test the pressure variation in the working process. Through the analysis of the pressures, it is proved that the forced deflection nozzle has the ability to compensate the variation of environmental pressure automatically. At present, the tests are going on still, the numerical simulation will be carried out to get further understanding of the flowfield of the forced deflection nozzle.