塞锥侧板对直排塞式喷管性能的影响

Effects of plug sidewall on linear plug nozzles performance

关键词:  火箭发动机  塞式喷管  塞锥侧板+  数值仿真

Key words:  Rocket engine  Plug nozzle  Plug sidewall~+  Numerical simulation

摘要:

为了解塞锥侧板对直排塞式喷管性能的影响,提出了对应着同一个塞锥的不同形状和高度的侧板。采用数值模拟的方法,得到了带有不同侧板的直排塞式喷管在不同工况下的流场和性能。比较了不同侧板形状和高度对直排塞式喷管性能的影响。结果表明:带有曲边侧板的塞式喷管的性能略高于带有直边侧板的塞式喷管,但不超过1%;没有侧板时塞式喷管性能要下降4%～6%;塞锥侧板的高度应不小于内喷管出口的高度,低于内喷管出口高度的侧板会降低塞式喷管性能;当侧板高于内喷管出口时,直排塞式喷管性能不随侧板高度的增加而增大。最后定性分析了带有不同侧板塞锥的流场结构,找出了产生这种结果的原因。

Abstract:

To understand the effects of plug sidewall on linear plug nozzles performance, sidewalls with different geometries and heights were brought forward. All of these sidewalls were fit on one plug. Numerical method was employed. Flowfields and performances of plugs with different sidewalls were obtained. Ways of sidewall affecting plug nozzles’ performance were found: efficiency of plug nozzles with curve sidewall was a bit larger than that of plug nozzles with line sidewall, not more than 1%; removal of sidewall could reduce plug nozzles performance by 4%～6%; sidewall’s height should not lower than internal nozzle exit, otherwise plug nozzles performance would be lowered; when sidewall height exceeds internal nozzle exit, increasing of sidewall height does not change plug nozzles performance. At last, Flowfield structures of plugs with different sidewalls were qualitatively analyzed. Reasons of leading to such effects were found.