| Autor: |
TIPA, Traian, SANDU, Constantin, VINTILA, Sebastian, SERBESCU, Horatiu |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2018, Vol. 2022 Issue 1, p020004-1-020004-6, 6p |
| Abstrakt: |
Nowadays, satellites have a short lifespan due to the limited quantity of propellant that can be taken on board. On the other hand, some of the used propellants are not environmentally friendly, some of them being considered even poisonous, as hydrazine. This paper presents a new design concept for an environmentally friendly satellite propulsion system where an advanced technology and materials are used. This propulsion system is presently in a research-designmanufacturing stage at the Romanian Research and Development Institute for Gas Turbines - COMOTI. To reduce the necessary propellant quantity, in the case of cold gas propulsion systems working with gaseous N2, the periodical heating of gas using concentrated solar light was considered. When the correction of satellite attitude is necessary, the cold N2 is sent from the main tank in a small service tank placed in the focal point of a gold plated composite parabolic mirror. The mirror is permanently oriented with the concave (reflective) surface to the Sun. The sun rays parallel with the mirror's symmetry plane are focused by the parabolic mirror on the service tank placed in its focal point (line). In this way the temperature of N2 from the service tank increases quickly with several degrees Celsius and the reaction force increases when the gas is expanded in the Laval nozzles. The parabolic mirror is made of carbon fiber composite, thus making the structure very light, (around 0.5 kg). The Laval nozzles have extremely thin walls (0.5 mm) being made using a technology of wall stiffening with Cerrobend alloy during machining. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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