EXPERIMENTAL ANALYSIS OF AMMONIA DISSOCIATION OF A HYDRAZINE PROPULLSION SYSTEM
| Autor: | CHENG-HSIEN SHEN, 沈政憲 |
|---|---|
| Rok vydání: | 1995 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 83 The purpose of this thesis research is to understand the behavior of the decomposition of (N2H4) in contact with Shell 405 catalyst. The results can be applied to the design of low -level hydrazine thrusters for satellite reaction control. The decomposition reaction of hydrazine can be summarized into two steps : (i) N2H4 -> NH3, N2 (exothermic reaction) (ii) NH3 -> N2, H2 (endothemic reaction) or described by an overall reaction N2H4 ->4/3(1-x)NH3 + 2xH2 + 1/3(1+2x)N2 + [1503-825x] (btu/lbm) where x is the extent of ammonia (NH3) dissociation. The analytical analysis were performed in a variable-length, cylindrical reactor. Pressure in reactor was controled by sets of choking nozzle (area: 0.0049, 0.011, 0.0195, 0.0438, 0.0779 in2 ). Temperatures and pressures at different positions were measured. The compositons of reaction products were analyzed by gas chromatograph. The experimental value of x were recorded for different configurations of catalytic bed length (15~35mm) and choking nozzle area (0.0049~0.0779 in2) for propellant flow rates 0.02 lbm/sec to 0.04 lbm/sec. The results show : Keeping the propellant flow rate constant, x decreses as the chamber pressures incresed by decresing the area of choking nozzle. Keeping the propellant flow rate constant, x decreses as the reaction time incresed by incresing the length of the catalytic bed. Keeping the length of the catalytic bed as well as the pressure constant, xdecreses as the propellant flow rate incresed. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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