标题： 结合光学发射光谱、侵入式测量和CFD模拟的VKI等离子体炬亚音速ICP射流的特性研究 显示英文标题

标题： Characterization of the VKI Plasmatron subsonic ICP jet combining optical emission spectroscopy, intrusive measurements, and CFD simulations

摘要： 本文研究了 von Karman 流体力学研究所（VKI）1.2 MW 感应耦合等离子体（ICP）风洞中的亚声速流特性，目标是针对 50 和 100 mbar 的腔室压力以及 150 至 300 kW 的输入电功率。通过更新的实验装置、校准程序和数据处理方法，对自由射流进行了紫外到近红外光学发射光谱测量，提供了高质量的空间分辨发射光谱。 在一定条件下，发射测量与热化学平衡预测一致，从而能够从推断出的自由射流焓值提取冷壁热流和动压的实验图谱。本文还详细比较了传统使用的特征化方法，强调了改进建模策略的必要性。 仅使用测量得到的自由射流温度和动压，提出了计算驻点线流的一种前向方法。该方法与通过一系列测试条件下的侵入式热流测量结果一致，并且对于文献中常见的参考铜探针的再结合系数值也一致。 结果表明，可以实现数值模拟与实验数据之间的一致框架，定义了改进的亚声速 ICP 射流特征化方法。 显示英文摘要

摘要： This paper addresses the characterization of the subsonic flow in the 1.2~MW Inductively Coupled Plasma (ICP) wind tunnel at the von Karman Institute for Fluid Dynamics (VKI), targeting chamber pressures of 50 and 100~mbar, and input electric powers between 150 and 300~kW. Ultraviolet to near-infrared optical emission spectroscopy measurements of the free-jet flow are carried out with an updated experimental set-up, calibration procedure, and data processing, providing high-quality absolute spatially-resolved emission spectra. Emission measurements agree with thermochemical equilibrium predictions within a range of conditions, allowing to extract experimental maps of cold-wall heat flux and dynamic pressure against the inferred free-jet enthalpy. A detailed comparison with the characterization methodology traditionally employed is presented, highlighting the need for an improved modeling strategy. Using the measured free-jet temperature and dynamic pressure only, a forward procedure for the computation of the stagnation line flow is proposed. The latter agrees with intrusive heat flux measurements through a range of test conditions, and for values of the recombination coefficient of the reference copper probe commonly found in the literature. Results demonstrate that a consistent framework between numerical simulations and experimental data can be achieved, defining an improved framework for the characterization of the subsonic ICP jet.