An Investigation of the Equilibrium Characteristics of the reaction between Hydrated Hydrazine and Shell 405
| Autor: | Yao-Te Peng, 彭耀德 |
|---|---|
| Rok vydání: | 2005 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 93 The reaction of hydrazine and catalyst(Shell 405) can instantaneously produce a large amount of the high temperature and low-molecular weight gas. This reactive characteristics is extensively applied on the propulsion field in aeronautic and astronautic industries. In recent years, due to the fast growth of nano- and pico-satellites, the needs of micro-scale propulsion system escalate simultaneously. However, the conventional material of MEMS devices can not sustain the high temperature generated by the fast decomposition of Hydrazine. In order to utilize the comparative low reaction temperature of hydrate hydrazine that potentially can be use as the propellant of micro propulsion systems, this thesis research investigated the characteristics of the reaction between hydrate hydrazine and Shell 405. The variations of reaction temperature and the degree of ammonia dissociation were experimentally observed at different pressures (60~140psi) and degrees of hydrated hydrazine (0��40%) at a constant fuel flow rate of hydrate hydrazine uniformly spray into a Shell 405 packed reactor. While measuring the temperature and the pressure in the reactor, gas chromatograph was adopted to quantitative analysis of ammonia dissociation. The experimental observations showed (1) The reaction temperatures of hydrate hydrazine/shell 405 decreased with increasing water percentage. (20~50K with 10% hydrate hydrazine at various pressures) (2) The rate of hydrazine dissociation decreased when water presented. This is probably caused by the reduction of the reactive site on Shell 405 due to water molecular adhesion. (3) The effect of water addition on hydrazine dissociation rate increased with pressure increasing. (4) The reaction temperature increased with pressure increasing, however, the effect of pressure on reaction temperature decreased with the increasing of water content. (5) Shell 405 did not show catalytic effect on ammonia dissociation at 393K, the degree of ammonia dissociation mainly relied on the reaction temperatures in the reactor. (6) The degree of ammonia dissociation decreased with the increasing of water content. As to be used in micro propulsion systems, the reaction temperature between hydrazine and Shell 405 was successfully reduced by adding water into hydrazine. With 0-25% of water addition, the temperature reduction was effective without significant rate reduction and change of ammonia dissociation. This research result showed that hydrate hydrazine is a potential propellant as the source of hot gas for micro propulsion systems. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|