Numerical simulation of supercritical carbon dioxide flows across critical point
Numerical simulation of supercritical carbon dioxide flows across critical point
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DOI：
10.1016/j.ijheatmasstransfer.2010.10.030
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发表时间：
2011-01
影响因子：
5.2
通讯作者：
S. Yamamoto;Takashi Furusawa;R. Matsuzawa
中科院分区：
文献类型：
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作者：
S. Yamamoto;Takashi Furusawa;R. Matsuzawa
对超临界二氧化碳过临界点流动进行了数值研究。本数值方法是基于山本开发的预处理方法和九州大学开发的流体热物理性质程序包中编写的二氧化碳热物理性质数学模型。首先，计算了改变体压时两平行平板间二氧化碳的二维自然对流。计算的超临界压力下的二氧化碳流的热物理性质进行了比较，在气体条件下。其次，计算了二氧化碳在O型循环通道中的自然对流，研究了相变引起的密度差对流动的影响。为了应用于高速流动，对超临界二氧化碳通过喷嘴的自由射流膨胀（称为超临界溶液快速膨胀过程）过程进行了计算。将计算得到的自由射流中激波到马赫盘的距离与实验结果进行了比较，并对改变入口温度时喷管内密度的变化进行了数值预测。
Numerical study of supercritical carbon-dioxide flows across the critical point is presented. The present numerical method is based on the preconditioning method developed by Yamamoto and mathematical models of thermophysical properties for carbon dioxide programmed in the program package for thermophysical properties of fluids, developed by Kyushu University. First, the two-dimensional natural convection of carbon dioxide between two parallel plates is calculated while changing the bulk pressure. The calculated thermophysical properties of the carbon-dioxide flow under supercritical pressure are compared with those in a gas condition. Next, the natural convection of carbon dioxide in an O-shaped cyclic channel is calculated, and the effect of the density difference induced by the phase change to the flow is investigated. For application to high-speed flows, supercritical carbon dioxide flows through a nozzle with free-jet expansion (known as the process of rapid expansion of supercritical solutions) process are calculated. The calculated shock distance to the Mach disk generated in the free jet is compared with experiments and the density variations in the nozzle while changing the inlet temperature are numerically predicted.