Abstract: The influences of various parameters of UV-fluorescence method on the test results of sulfur content of space kerosene were systematically studied. The laws of the change of sulfur signal integral value of space kerosene with injection speed, injection volume,negative high voltage,cracking oxygen flow rate, argon flow rate, imported oxygen flow rate and cracking temperature were analyzed. The optimal test conditions were obtained. The experimental results showedthe main factors affecting the accurate determination of sulfur content by UV fluorescence method were injection rate, oxygen flow rate, argon flow rate and negative high voltage.The optimal injection rate and argon flow rate were affected by the thermal cracking of space kerosene,the optimal cracking oxygen flow rate was related to the injection rate,the negative high voltage range was determined by the baseline noise condition,the optimal injection volume was determined by the influence of negative high pressure on the minimum injection volume.Thisstudy provides a reference to measure accurately the sulfur content of aerospace kerosene by ultraviolet fluorescence method, and also provides an experimental method to explore the best test conditions.

Key words: aerospace kerosene, sulfur content, ultraviolet fluorescence method, thermal cracking