Si Yang , Hangbin Zhao , Nailiang Zhuang , Xiaobin Tang
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Thermal protection of the nuclear rocket engine nozzle based on regenerative cooling method
In the design of the nuclear rocket engine nozzles, the heat in the throat area of nozzles is so intense that the temperature may exceed the endurance of existing materials. Regenerative cooling technology is a widely employed method for effectively cooling the nozzle. The influences of a strategy involving the arrangement of ribs in the regenerative cooling channel are investigated. The flow and heat transfer characteristics in the regenerative cooling channels with three different types of ribs are compared and analyzed. In accordance with the computational results, two composite structures are proposed. Moreover, the flow and heat transfer characteristics in the bending channel with these two composite structures are calculated and analyzed. The results show that the straight and streamlined ribs can reduce the maximum temperature only when the height is lower than 1 mm. The side rib can reduce the temperature near the rib. For the composite rib, when the distance between the side rib and bottom rib is ranging from 3 cm to 5 cm, the appearance of the high temperature zone, which is located near the bottom rib can be prevented. Moreover, in the bending channel, the straight composite rib can considerably reduce the maximum temperature in the throat area by 96 K. However, the streamlined composite rib can only reduce the wall temperature near the rib.
期刊介绍：
The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review.
The fundamental subjects considered within the scope of the journal are:
* Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow
* Forced, natural or mixed convection in reactive or non-reactive media
* Single or multi–phase fluid flow with or without phase change
* Near–and far–field radiative heat transfer
* Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...)
* Multiscale modelling
The applied research topics include:
* Heat exchangers, heat pipes, cooling processes
* Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries)
* Nano–and micro–technology for energy, space, biosystems and devices
* Heat transport analysis in advanced systems
* Impact of energy–related processes on environment, and emerging energy systems
The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.
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