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利用STF元件(后掠梯形一旗形插入件)的自激振荡组件系统特性和有限翼展机翼特性进行了管内紊流强化换热的研究。实验表明:STF元件具有比RF元件(矩形旗形插入件)更显著的强化换热净效益,BSTF元件(双边后掠梯形一旗形插入件)的阻力损失与RF元件相差不大,换热系数增加却比RF元件高出近一倍。实验和分析都表明,后掠角β对换热系数和阻力损失的增加产生较大影响。在后掠角β=75.9°～77.3。范围内,STF元件可获得最大强化换热净效益。
The turbulence-enhanced heat transfer in the pipe was studied by using the characteristics of the self-oscillating assembly of the STF element (swept trapezoidal-flag-shaped insert) and the characteristics of the finite wing spanfoil. The experimental results show that the STF element has more significant net benefit of heat transfer enhancement than the RF element (rectangular flag insert). The resistance loss of the BSTF element (bilateral swept trapezoidal-flag-shaped insert) is similar to that of the RF element, The coefficient increases nearly twice as much as the RF components. Experiments and analyzes show that the sweep angle β has a great influence on the increase of heat transfer coefficient and resistance loss. The sweep angle β = 75.9 ° ~ 77.3. Within the scope of STF components can maximize the benefits of enhanced heat transfer.