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对流动分岔后的超临界二氧化碳在平面对称突扩管中进行强迫对流换热进行了数值模拟,研究了热流密度在流体发生流动分岔现象后流动特性的影响。计算结果表明:随着热流密度的增加,临界雷诺数和转换雷诺数减小,流动稳定性遭到削弱;对应于相同的雷诺数,由于流动分岔引起的不对称压力分布随着热流密度的增加对应于突扩管上、下半部有不同变化规律,这使得对应回流区的大小分别减小和增大。
The forced convection heat transfer of bifurcated supercritical carbon dioxide in a planar symmetric expansion tube was numerically simulated. The effect of heat flux on the flow characteristics of the bifurcated fluid flow was studied. The results show that as the heat flux density increases, the critical Reynolds number and the Reynolds number decrease, and the flow stability is weakened. Corresponding to the same Reynolds number, the asymmetric pressure distribution due to flow bifurcation changes with the heat flux density Increase corresponding to the sudden expansion of the tube, the lower half have different changes, which makes the size of the corresponding reflux zone were reduced and increased respectively.