Turbulence and radiation behaviours in large-scale arc heaters
Turbulence and radiation behaviours in large-scale arc heaters
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DOI：
10.1088/0022-3727/44/8/085203
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发表时间：
2011-03
期刊：
影响因子：
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通讯作者：
Yusuke Takahashi;H. Kihara;K. Abe
中科院分区：
文献类型：
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作者：
Yusuke Takahashi;H. Kihara;K. Abe
对 JAXA 750 kW 和 NASA 20 MW 设施等大型电弧加热器中的湍流等离子体流进行了研究，并成功获得了流场特性的分布。湍流场由具有多温度模型的纳维-斯托克斯方程描述，该方程与电场和辐射场计算紧密耦合。流场模拟中引入了精确且低成本的辐射模型和低雷诺数二方程湍流模型。经证实，电弧加热设备中的等离子流在膨胀段处于高度热化学非平衡状态，并且电弧放电在加热段中起着至关重要的作用。定量地阐明了辐射和湍流现象对于将热量和动量从靠近核心的高温流传递到靠近设施壁的冷气体区域非常重要。为了证实本数值模型的有效性，将获得的结果与电弧电压、质量平均热函、室压力和热效率的实验数据进行了比较。目前的流场模型被发现对于设施的各种操作条件具有良好的一致性。
Turbulent plasma flow in large-scale arc heaters such as JAXA 750 kW and NASA 20 MW facilities was investigated and distributions of flow-field properties were successfully obtained. The turbulent flow field was described by the Navier–Stokes equations with a multitemperature model, which was tightly coupled with electric-field and radiation-field calculations. An accurate and low-cost radiation model, and a low Reynolds number two-equation turbulence model were introduced into the flow-field simulation. It was confirmed that the plasma flows in the arc-heating facilities were in a highly thermochemical nonequilibrium state in the expansion section and that the arc discharge plays a critical role in the heating section. It was quantitatively clarified that radiation and turbulence phenomena were very important in transferring heat and momentum from the high-temperature flow near the core to the cold gas region near the facility wall. To confirm the effectiveness of the present numerical model, the obtained results were compared with experimental data for the arc voltage, mass-averaged enthalpy, chamber pressure and heat efficiency. The present flow-field model was found to give good agreement for various operating conditions of the facilities.