Flow distribution characteristics of China No.3 kerosene (RP-3) in vertical parallel U-turn tubes were experimentally investigated under supercritical pressures.Based on the experimental results

the effects of temperature

pressure and asymmetrical heat flux to the flow distribution characteristics of the RP-3 were analyzed.In the experiments

the inner and outer diameters of the test tube are 1.8mm and 2.2mm respectively;the mass flow rate is maintained at 4g/s under the pressure from 3 to 5MPa

and the heat flux changes from 60 to 240kW/m2.The test results indicate that static unsteady phenomenon will be induced when fuel temperature is close to its pseudo-critical point under the lower pressure

which leads to flow imbalance and flow redistribution between the two tubes.In addition

the mass flow in the branch tube is significantly affected by the non-uniformity of heat flux

and the system stability can be improved effectively by the increase of pressure and which will inhibit the flow distribution differences in the parallel pipes.