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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Numerical thermofluid simulation on tandem type of induction thermal plasmas with and without current modulation in a lower coil
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Numerical thermofluid simulation on tandem type of induction thermal plasmas with and without current modulation in a lower coil

机译：较低线圈中电流调制串联型诱导热等离子体的数值热流体模拟

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This paper describes numerical calculations on tandem-type induction thermal plasmas with and without current modulation of the lower coil. The tandem type of induction thermal plasma (tandem-ITP) has been developed with two independent rf coils in one plasma torch for stable operation and spatial control of temperature field in ITP. Furthermore, the coil current modulation for tandem-ITP, i.e. tandem type of pulse-modulated induction thermal plasma (tandem-PMITP), is expected to offer a temporo-spatially varying temperature field in the plasma torch. First, as described in this paper, a numerical thermofluid model was developed for tandem-ITP/PMITP with an upper coil and a lower coil to investigate unique temperature and gas flow fields. Secondly, the influence of gap length between the upper coil and the lower coil was studied in the tandem-ITP under steady state conditions. Results show that a shorter gap length between two coils of the tandem-ITP is favourable for materials processing because it suppresses unfavourable radial gas flow to the wall in the plasma torch. Thirdly, transient calculation was conducted for the tandem-PMITP with current modulation in the lower coil to investigate effects of an off-time modulation parameter on the temperature field. Results showed that coil current modulation provides unique temporo-spatially varying temperature and gas flow fields. Finally, calculation results for a tandem-PMITP were compared with those for a single-coil PMITP. Comparison revealed that tandem-PMITP has higher robustness in modulated induction thermal plasma by maintaining a higher-temperature region than that of the single-coil MITP. The tandem-PMITP can provide more controlled temperature and gas flow fields.
机译：本文介绍了串联型感应热等离子体的数值计算，而没有下线圈的电流调制。在一个等离子体炬中使用两个独立的RF线圈开发了串联型诱导热等离子体（TANDEM-ITP），用于稳定运行和ITP温度场的空间控制。此外，预计串联ITP的线圈电流调制，即串联脉冲调制的感应热等离子体（串联PMITP），在等离子体焊卷中提供一个时间空间变化的温度场。首先，如本文所述，用上线圈和下线圈的串联-TIP / PMITP开发了数值热流体模型，以研究独特的温度和气体流场。其次，在稳态条件下在串联-TIP中研究了上线圈和下部线圈之间的间隙长度的影响。结果表明，串联ITP的两个线圈之间的较短间隙长度有利于材料处理，因为它抑制了等离子体火炬中的壁的不利径向气体。第三，在下部线圈中具有电流调制的串联PMITP进行瞬态计算，以研究对温度场的效果。结果表明，线圈电流调制提供了独特的Tway-Spative Indument温度和气体流场。最后，将串联PMITP的计算结果与单卷PMITP的计算结果进行了比较。比较揭示了通过维持高于单线圈MITP的更高温度的区域，串联PMITP在调制的感应热等离子体中具有更高的鲁棒性。串联PMITP可以提供更受控的温度和气体流场。

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