Experimental investigation of high-density hydrocarbon fuel JP-10 on flow heat transfer and pyrolysis characteristics
Based on the background of development in regenerative cooling technology,the flow heat transfer characteristics and thermal cracking coking characteristics of high-density endothermic hydrocarbon fuel JP-10 were experimentally studied in a Φ4 mm×1 mm high-temperature alloy steel round tube under the conditions of heat flux density of 100-2000 kW/m2 and normal pressure to 6 MPa.The results of the experiments indicate that under 2 MPa pressure,1204.6 kW/m2 is the critical heat flux density for the deterioration of kerosene heat transfer.The experiments have delineated the heat transfer regions of kerosene under subcritical/supercritical pressures:entrance region,forced convection heat transfer region,(pseudo)subcooling boiling region,(pseudo)saturated boiling region,etc.It was observed that fluid temperature primarily governs fuel coking,with the onset of coking occurring at 679℃,652℃,and 643℃under pressures of 2,4,and 6 MPa,respectively.The wall temperature synchronously affects coking quantity after high coking reactions occur.The main reason is that the coking in the fuel pipe intensifies with the increase in pressure,and the residence time of the high-temperature fuel in the pipeline increases.
regenerative coolinghydrocarbon fuelflow heat transfercokingresidence time
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