| An endothermic hydrocarbon fuel serves as both of coolant and propellant in the modern supersonic aircraft. This work focuses on the pyrolysis, coking and inhibition of cokes of the endothermic hydrocarbon fuels in order to provide fundamentals for their modification and application. The main contents and the corresponding results are summarized as the follows:The alkane (n-heptane), cycloalkane (cyclohexane), multicycloparaffin (tricyclo [5.2.1.0(2.6)] decane) and a kerosene-based fuel (ZH100) are chosen as the models of endothermic hydrocarbon fuels. The heat sinks of these fuels have been measured under the conditions in the temperature range of 500-650℃, at the pressure of 4 MPa and at different flow rates. The main factors which affect on the heat sinks are studied in detail. Under the experimental conditions, the highest value of the heat sink is determined as 2.67 MJ-kg"1 and the main contribution to the heat sink is the physical one, while the chemical heat sink is very low. The values of the heat sinks measured under the same condition are in the order of JP-10< cyclohexane< n-heptane.The effects of reaction temperature, pressure and flow rate on the pyrolysis and coking of three fuels, n-heptane, cyclohexane, JP-10, have been studied. The experimental results indicate that the main factors affect on the pyrolysis of the fuels are the reaction temperature and the residence time. With the increase of the reaction pressure, the residence times of the fuels are prolonged and the conversions are highly increased. The pyrolysis properties vary widely with the different structures of the model fuels. The conversions of three model fuels measured under the same conditions are in the order of cyclohexane< JP-10 |
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