首页> 外文会议>56th International Astronautical Congress 2005 vol.7 >PROTOTYPING AND EXPERIMENTAL CHARACTERIZATION OF A MICROPROPULSION SYSTEM BASED ON SUPERSONIC COLD- GAS AND WARM-GAS MICRONOZZLES
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PROTOTYPING AND EXPERIMENTAL CHARACTERIZATION OF A MICROPROPULSION SYSTEM BASED ON SUPERSONIC COLD- GAS AND WARM-GAS MICRONOZZLES

机译:基于超音速冷气和温热气微喷嘴的微推进系统的原型设计和实验表征

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This paper reports the latest results obtained during the development of a micropropulsion system based on supersonic cold-gas and warm-gas micronozzles for attitude control of micro and nanosatellites for a thrust of the order of 100 microN to 1 mN. The micronozzles have been manufactured by means of nanolithography and Reactive-Ion Etching and are assembled with the other MEMS components in microthruster modules, each able to produce up to 4 thrust vectors with minimum pulse of 100 ms fully adjustable from 0 to 100% of thrust. The integration of a resistor in the module enables the increase of specific impulse by heating the gas before the micronozzle. Measurements of thrust under vacuum condition have been performed by means of a specifically designed microbalance. The comparison between the experimental data and the CFD simulation has been used to study the effect of the losses in the nozzle in order to select the best geometry.rnSpecific impulses between 30 s and 100 s have been observed under different heating conditions.rnThe complete micropropulsion system including tank, valves, piping and thruster modules for application on 3 axis stabilization of micro and nanosatellites has been designed and is in course of prototyping.rnThis work is included in a research program aiming at the realization of efficient micropropulsion devices and systems enabling full 3 axis stabilization as well as orbital maneuver capability for nano and microsatellites.
机译:本文报道了在基于超音速冷气和暖气微喷嘴的微推进系统的开发过程中获得的最新结果,该系统用于控制微卫星和纳米卫星的姿态,推力范围为100 microN到1 mN。微喷嘴已经通过纳米光刻和反应离子刻蚀技术制造,并与微推力器模块中的其他MEMS组件组装在一起,每个组件都能产生4个推力矢量,最小脉冲为100毫秒,可在推力的0至100%范围内完全可调。通过在模块中集成电阻器,可以通过在微喷嘴之前加热气体来增加比脉冲。真空条件下的推力测量是通过专门设计的微量天平进行的。为了选择最佳的几何形状,已将实验数据与CFD仿真之间的比较用于研究喷嘴损失的影响.rn在不同加热条件下观察到了30 s至100 s之间的特定脉冲。rn完整的微推进已经设计出了系统,包括用于微卫星和纳米卫星3轴稳定的油箱,阀门,管道和推进器模块,并且正在制作原型。rn这项工作包括在研究计划中,旨在实现高效的微推进装置和系统,从而实现完整三轴稳定以及纳米和微卫星的轨道机动能力。

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