喷管喉部沉积层的初始沉积速度预估

PREDICTION ON INITIAL DEPOSIT VELOCITY OF THE CONDENSED PHASE PARTICLES ON THE THROAT SURFACE

关键词:  喷管喉部  喷管气流  氧化铝  沉积  固体火箭发动机

Key words:  Nozzle throat  Nozzle flow  Aluminiun oxide  Deposition  Solid rocket engine

摘要:

本文以两种理论分析方法分析了固体火箭发动机喷管喉部沉积层的形成规律.其一,针对喉部沉积层是喉部上游沉积物流动的结果的论点,以粘性层流理论分析了液体薄层的流动性质,并对此论点提出了不同看法.其二,以粒子的宏观运动规律出发,推导粒子的初始沉积速度公式,并取得成功.从而弥补了在沉积问题的理论分析中必须借助于实验资料的不足.

Abstract:

For motors with metallized solid propellant, the condensed metal oxide flow through the nozzle deposits semewhat on the nozzle surface,which effects on the performance of the motor with small throat strongly. Therefore, it is necessary to investigate the deposition regulations .Based on the moving rule of the particles,a theoretical prediction method of the initial deposit velocity is developed in this paper.Some computation examples are given.It is shown that the theoretical results accord with the experiment phanomena.