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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical investigation on effects of thermophysical properties on fluid flow in hydraulic retarder
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Numerical investigation on effects of thermophysical properties on fluid flow in hydraulic retarder

机译：热物理性质对液力缓速器中流体流动影响的数值研究

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摘要

Recognizing the faultiness of ignoring that thermophysical properties of transmission medium varied with the temperature, a comparative assessment of two cases was performed by computational fluid dynamics (CFD) method in capturing braking performance, internal flow field and fluid structure interaction for hydraulic retarder. The case considering the variation of thermophysical properties greatly improved the prediction accuracy due to the simulation conditions closer to experiment. Braking torque could be increased because of the enlargement of density and the reduction of viscosity, while there was no obvious effect on braking performance for specific heat and thermal conductivity. For internal flow field, the enlargement of density and the reduction of viscosity together lead to an increase in velocity, which in turn resulted in an increase in pressure, then the reduction of viscosity could suppress the generation of vortices reflected by the decrease in vorticity, which could positively reduce the energy loss near the wall. Finally, a comparative analysis between fluid structure interaction (FSI) and thermal fluid structure interaction (TFSI) was conducted. The results indicated that the deformation and equivalent stress significantly increased compared with original simulation conditions due to the presence of thermal stress, which obviously increased the stress damage of hydraulic retarder housing.
机译：认识到忽略传输介质的热物理特性随温度变化的缺点，通过计算流体力学（CFD）方法对两种情况进行了比较评估，以捕获液压缓速器的制动性能，内部流场和流体结构相互作用。由于模拟条件更接近实验，因此考虑热物理性质变化的情况大大提高了预测精度。由于密度的增大和粘度的降低，可以增加制动扭矩，而对于比热和导热率，制动性能没有明显的影响。对于内部流场，密度的增加和粘度的降低共同导致速度的增加，进而导致压力的升高，然后粘度的降低可以抑制涡度降低所反映的涡旋的产生，可以积极减少墙附近的能量损失。最后，对流体结构相互作用（FSI）和热流体结构相互作用（TFSI）进行了比较分析。结果表明，由于存在热应力，与原始模拟条件相比，变形和等效应力显着增加，这明显增加了液力缓速器壳体的应力损伤。

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