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 ...

中文翻译：

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下部线圈中带和不带电流调制的串联型感应热等离子体的数值热流模拟

本文介绍了在有或没有下部线圈电流调制的情况下，串联型感应热等离子体的数值计算。串联型感应热等离子体（tandem-ITP）已开发成在一个等离子炬中具有两个独立的rf线圈，以实现ITP中温度场的稳定运行和空间控制。此外，期望用于串联ITP的线圈电流调制，即串联类型的脉冲调制感应热等离子体（串联PMITP），将在等离子体炬中提供时空变化的温度场。首先，如本文所述，为串联ITP / PMITP开发了一个数值热流体模型，该模型具有一个上部线圈和一个下部线圈，以研究独特的温度和气体流场。其次，在稳态条件下，在串联ITP中研究了上线圈和下线圈之间的间隙长度的影响。结果表明，串联ITP的两个线圈之间的间隙长度较短，对于材料...