过滤结构对贮箱增压用燃气发生器输出性能的影响

Influence of Filter Structure on the Output Performance of Gas Generator for Tank Pressurization

针对某液体姿控发动机贮箱增压用低燃温燃气发生器,开展了内部过滤结构对其输出性能影响的试验研究。试验验证及结果分析表明:燃气发生器内部压强曲线的升高是由贮箱与过滤结构的共同影响造成的;即使贮箱反向压力不超过喷管临界压强,但在反向压力作用下药剂燃烧产生的固体残渣更易堵塞过滤层成为二次喉道,使燃气发生器内部工作压强依然持续升高;在满足燃气洁净度及降温吸热的前提下,采用低燃温复合推进剂的贮箱增压用燃气发生器的过滤层相对密度不宜超过0.45。

Aimed at some low combustion temperature gas generator used for some liquid attitude control engine tank pressurization,the influences of internal filter structure on output performance of gas generator were studied by tests.The test results show that the increase of gas generator inter pressure is caused by the combined influences of tank back pressure and filter structure.Even if the tank back pressure does not exceed the critical pressure of nozzle,the solid residue generated by composition combustion is more likely to block the filter layer and become the secondary throat under the condition of back pressure,which cause the working pressure inside the back of gas generator still continues to rise.Under the premise of gas cleanliness and cooling and heat absorption,the relative density of filter layer of the gas generator for tank pressurization using low combustion temperature solid propellant should not exceed 0.45.