A Study of the Design Parameters of Low-thrust Hydrazine Propulsion Thrusters

• Main Authors: Liu, Sue-Fam, 劉書帆
• Other Authors: Tony Yuan
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/80279516768928090133

碩士 === 國立成功大學 === 航空太空工程學系 === 84 === The purpose of this thesis research is to study the effects of cat- alytic bed dimensions on the hydrazine decomposition in contact with shell 405 catalyst. The hydrazine flow rate was kept constant (4.54xE-3 kg/sec). Two ca- talytic bed loads were studied (7.5g and 11g)with 3 different cylindrical shapes. Temperature and pressure at various positions in the reactor were monitored and the products of the action were on-line analyzed by gas chr- omatograph. The extent of ammonia dissociation (X) were determined with the N2 and NH3 concentrations contained in the reaction products. Propul- sive parameters were calculated by assuming ideal nozzle design with the temperature, pressure, and X values measured during experiments. The res- ults show: (1) With a constant catalytic bed load, increasing of the length of the bed increases the extent of ammonia dissociation. (2) Although pressures of the reactor are not affected by changing the cyl- indrical shape of the catalytic bed with constant bed loads, temperature is decreased for longer bed-length shapes. (3) Keeping constant catalyst, pressure suppresses reactions at relative low pressure (chemical reaction controlled). However, pressure accelerates reactions at relative high pressure (physical controlled).