Jian Liu , Mengyao Xu , Wenjie Guo , Wenxiong Xi , Chaoyang Liu , Bengt Sunden
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引用次数: 0
摘要
在马赫数极高（Ma ≥8）的情况下，煤油面临着裂解问题，而用于再生冷却的散热片有限。超临界 CO2 具有出色的传热和传质能力，可作为再生冷却的附加冷却方式，并且可以轻松地将热量转化为发动机电力系统所需的电能。在本研究中，使用 sCO2 的再生冷却通道采用了针形鳍片，以进一步增强在极高热通量下的热传递。考虑到节距比、固体材料和加速度的影响，本研究采用 k-ω SST 模型对传热和流体流动进行了分析。研究结果表明，与光滑的冷却通道相比，针状鳍片通道（情况 3）的传热性能提高了 3.08，摩擦系数提高了 4.66，热性能提高了 1.84，在 Re = 45,000 时，受热面的最高温度降低了 36%。最大速度出现在近壁区域，由温差和加速度的综合影响决定。当通道材料为导热系数较高的铜时，最高温度比钢通道降低了 37%，温度分布也更加均匀。
Flow and heat transfer mechanism of a regenerative cooling channel mounted with pin-fins using supercritical CO2 as coolant
At extremely high Mach number (Ma ≥8), kerosene is faced with issues of cracking with a limited heat sink for regenerative cooling. Supercritical CO2 can be used as additional cooling method for regenerative cooling because of its excellent heat and mass transfer capability and it can easily convert heat into electricity for the engine electric system. In this study, pin-fins are applied to a regenerative cooling channel using sCO2 to further enhance heat transfer at extremely high heat flux. Heat transfer and fluid flow are analyzed by the k-ω SST model considering effects of pitch ratio, solid materials and accelerations. From this study, compared with a smooth cooling channel, the pin-fin channel (Case 3) obtains a heat transfer enhancement of 3.08, a friction factor of 4.66, thermal performance enhancement of 1.84, and the maximum temperature of the heated surface is decreased by 36 % at Re = 45,000. The maximum velocity is found at the near-wall regions determined by the combined effects of temperature difference and accelerations. When the channel material is Cu with the high thermal conductivity, the maximum temperature is decreased by 37 % compared with a steel channel and the temperature distribution also becomes more uniform.
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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