Turbulence Statistics of Thermo-Buoyancy Supercritical Fuel Flow in a Regenerative Cooling Channel

SUN Feng, XIE Gongnan

热科学学报 ›› 2024, Vol. 33 ›› Issue (1) : 126-137.

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热科学学报 ›› 2024, Vol. 33 ›› Issue (1) : 126-137. DOI: 10.1007/s11630-023-1876-x  CSTR: 32141.14.s11630-023-1876-x

Turbulence Statistics of Thermo-Buoyancy Supercritical Fuel Flow in a Regenerative Cooling Channel

  • SUN Feng1,2, XIE Gongnan1*
作者信息 +

Turbulence Statistics of Thermo-Buoyancy Supercritical Fuel Flow in a Regenerative Cooling Channel

  • SUN Feng1,2, XIE Gongnan1*
Author information +
文章历史 +

摘要

以超临界碳氢燃料为冷却剂的主动再生冷却被认为是超燃冲压发动机的最具前景热防护方法之一。热浮力会导致强烈的流动各向异性和热传输特性,为分析超临界碳氢燃料湍流输运机制,采用大涡模拟(LES)数值方法对不同湍流尺度下热浮力湍流脉动演化规律进行研究。发现在热分层流中,惯性力和浮升力一起主导分层湍流的发生、发展和衰退;空间热浮力效应显著抑制垂向脉动强度,随着热浮力和惯性力充分发展,两力极大地削弱垂向及流向脉动强度;此外,指出近壁区热输运特性需重点关注,温度混合边界层变薄致使垂向热通量衰减,抑制垂向温度扩散,易发生传热恶化极端工况。相关成果可丰富学术界对超临界流体流动传热机理的认识。

Abstract

Active regenerative cooling with supercritical hydrocarbon fuel is considered as the most promising thermal protection method. The existence of buoyancy force would lead to strongly anisotropic flow and thermal transport characteristics. It is closely related to the cooling performance of the engine. To elucidate the mechanisms of turbulent transport, the large eddy simulation (LES) was performed to assess turbulence statistics within different turbulence scales. The results indicated that the buoyancy and inertial force together dominated the change of turbulent structure. Moreover, the spatial thermal buoyancy effect significantly suppressed the vertical velocity fluctuation. This is due to the laminar motion caused by the buoyancy force, thereby weakening the thermal transport. For the statistics of velocity fluctuation, it was found that the buoyancy force and inertial force greatly weaken the vertical and streamwise velocity fluctuation, respectively. For the statistics of thermal transport, the results pointed out that the near-wall heat transport characteristics need to be paid more attention. The thickness of the temperature mixing boundary layer led to the attenuation of vertical heat flux, which inhibited vertical temperature diffusion and predisposed to extreme conditions of heat transfer deterioration. The results can enhance the academic understanding of the heat transfer mechanism of supercritical fluids, and give guidance for further applications of thermal protection.

关键词

active regenerative cooling / large eddy simulation (LES) / buoyancy force / turbulence statistics

Key words

active regenerative cooling / large eddy simulation (LES) / buoyancy force / turbulence statistics

引用本文

导出引用
SUN Feng, XIE Gongnan. Turbulence Statistics of Thermo-Buoyancy Supercritical Fuel Flow in a Regenerative Cooling Channel[J]. 热科学学报, 2024, 33(1): 126-137 https://doi.org/10.1007/s11630-023-1876-x
SUN Feng, XIE Gongnan. Turbulence Statistics of Thermo-Buoyancy Supercritical Fuel Flow in a Regenerative Cooling Channel[J]. Journal of Thermal Science, 2024, 33(1): 126-137 https://doi.org/10.1007/s11630-023-1876-x

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基金

This work was sponsored by the National Natural Science Foundation of China (51676163), the National 111 Project under Grant No. B18041.

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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