轴对称喷管喉道面积射流控制数值模拟研究

Computational investigation on axisymmetric nozzles with fluidic injection for throat area control

关键词:  喷管  喉道面积  射流控制

Key words:  Nozzle  Throat area  Fluidic

摘要:

利用数值模拟方法,针对轴对称喷管,研究了喉道注气对喷管流动的影响。在此基础上,研究了注气流量、注气角度、喷管扩张角等对喷管流动和内特性的影响。数值模拟结果表明,喉道注气可以显著减小喷管流量,改变喷管有效喉道面积;喉道注气使喷管实际膨胀比增大,产生过膨胀损失,使推力性能降低;注气流量比较大时,喉道注气可以形成开放的回流区,使喷管实际的膨胀比减小,提高了喷管的推力性能。

Abstract:

A computational investigation on an axisymmetric nozzle with fluidic injection for throat area control was conducted to assess the impact of fluidic injection on nozzle internal flow.The effect of injection mass flow ratio,injection angle,and divergent angle on nozzle flow and internal nozzle performance was discussed.Computational results indicate that fluidic injection in throat can decrease nozzle mass flow ratio and change the effective throat area as well as increase the actual expansion ratio.Thus it can result in nozzle thrust loss.In some cases,fluidic injection in throat can lead to form open recirculation region which can decrease the actual expansion ratio and improve thrust performance.