The Behavior of Turbulent Heat Transfer Deterioration in Supercritical Hydrocarbon Fuel Flow Considering Thermal Resistance Distribution
The Behavior of Turbulent Heat Transfer Deterioration in Supercritical Hydrocarbon Fuel Flow Considering Thermal Resistance Distribution
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DOI：
10.1016/j.ijthermalsci.2019.03.027
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发表时间：
2019-07
影响因子：
4.5
通讯作者：
Feng Sun;Yong Li;B. Sundén;G. Xie
中科院分区：
文献类型：
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作者：
Feng Sun;Yong Li;B. Sundén;G. Xie
为了突出先进发动机冷却系统的热管理，对矩形通道中碳氢燃料湍流的流动和传热特性进行了详细的数值研究。研究了传热过程中行为恶化的严重条件。考虑浮力效应，建立了三维数值模型，并采用了实际工况下经过验证的SST k-ω湍流模型。发现受热壁附近存在强烈的热分层现象，充分证明需要考虑流场分裂。流动和传热的波动特性和相对稳定的状态分别在恶化区域和恢复区域执行。此外，考虑到粘性底层和核心湍流场，提出了一种基于热阻机制的新的恶化预测，并且在评估恶化环境的发生方面表现良好。在某些条件下，局部恶化行为与热阻的形式密切相关。
To highlight the thermal management of the cooling system in an advanced engine, the flow and heat transfer characteristics of turbulent hydrocarbon fuel flow in a rectangular channel are numerically explored in detail. The severe condition of deteriorated behavior is investigated in the heat transfer process. Considering buoyancy force effects, a three-dimensional numerical model is established and a validated SST k-ω turbulence model is adopted at real working conditions. It is found that there is a strong thermal stratification phenomenon near the heated wall, which sufficiently proves that the splitting up of flow field needs to be considered. The fluctuating characteristics and a relative stable state of flow and heat transfer is performed in the deteriorated and recovery region, respectively. In addition, taking the viscous sublayer and core turbulent field into consideration, a new deteriorated prediction based on the thermal resistance mechanism is proposed and it performed well to evaluate the onset of the deteriorated environment. Under certain conditions, the local deteriorated behavior is strongly related to the form of thermal resistance.