流阻对200N单推-3发动机热试车工作特性的影响

Effects of Flow-Resistance on Hot Test Working Characteristics of 200N DT-3 Thruster

管道及阀门内部流阻会显著影响发动机工作性能。为探究不同管路流阻大小下200N单推-3发动机工作特性,开展了光管和波纹管两种管路200N发动机热试车试验研究。结果表明:大流阻工况喷前压下降约42.8%。热试车前后喷前压振荡剧烈,不利于发动机平稳工作。管路流阻显著影响脉冲燃压,小流阻脉冲燃压建立约2.5MPa,大流阻脉冲工作燃压建立约1MPa,远低于前者;管路流阻显著影响阀门启动特性,大流阻状态下,阀门启动时间(T_(80))约为小流阻状态的3.93~5.28倍,管路流阻对阀门电流影响很小;小流阻状态下脉冲冲量显著大于大流阻状态下的脉冲冲量,约为后者1.5~2.1倍。

The working characteristics of 200N DT-3 thrusters could be changed remarkably by the flowresistance of tubes and valves.To investigate the working characteristics of 200N DT-3 thrusters under different flow-resistances,the working characteristics of 200N DT-3 thrusters under the slick tube and rippled tube were tested and contrasted.The results show that the pressure in front of the injector deceases 42.8%under large flow-resistance.The pressure in front of the injector before and after hot tests changes acutely which is bad for the steady working of thrusters.The pressure in the chamber is influenced greatly by the flow-resistance of tubes.The pressure in the chamber sets up at 1MPa under large flow-resistance,which is lower than that under the small flow-resistance at 2.5MPa.The start-up characteristics of the thrusters is influenced remarkably by the flow-resistance.The valve starting time(T_(80))of the thrusters under large flow-resistance is 3.93~5.28 times of the small flow-resistance.There is almost no effect on the valve current under different flow-resistances.The pulse impulse of small flow-resistance is significantly bigger than that of the large flow-resistance,1.5~2.1 times of the large flow-resistance.