To study the surface temperature distribution characteristics and related control methods of cryogenic non-thermal equilibrium cylinders under complex heat transfer conditions

this study establishes two models of heat transfer enhancement methods appended to pure top ventilation: an additional local nozzle air supply and a radiation screen. The temperature characteristics

such as radial temperature gradient

body temperature non-uniformity

and surface temperature non-uniformity of the cylinder

are analyzed by numerical simulation methods. The accuracy of the numerical simulation results was verified by experiments. On this basis

the influence of different heat transfer methods and operating parameters was quantitatively analyzed. The results show that

compared with simple top ventilation

the local nozzle air supply can increase the average temperature decrease of the cylinder by 5.1%

the temperature non-uniformity of the cylinder can be increased by 38.3%

and the temperature unevenness of the cylinder surface can be reduced. The temperature gradient of the cylinder was controlled on the side near the heat-conducting surface. With the addition of a cryogenic radiation screen

the coupled heat transfer of convection and radiation can reduce the average temperature decrease of the cylinder by 2.3%

increase the temperature unevenness of the cylinder by 57.5%

and reduce the temperature unevenness of the cylinder surface.