Lorenzo Capponi, Alberto Padovan, Gregory S. Elliott, Marco Panesi, Daniel J. Bodony, Francesco Panerai
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引用次数: 0
摘要
电感耦合等离子体风洞对于在地面测试中复制高超音速飞行条件至关重要。要达到所需的条件(例如重返大气层时的停滞点热流和焓),需要仔细选择操作输入,如质量流、气体成分、喷嘴几何形状、火炬功率、腔室压力和沿等离子体射流的探测位置。本文的研究重点是在伊利诺伊大学厄巴纳-香槟分校的 350 kW Plasmatron X ICP 设备中,火炬功率和腔室压力对等离子体射流动力学的影响。通过高速成像收集的发射光测量数据,对选定功率-压力条件下的射流行为进行了多域分析。然后,我们使用高斯过程回归开发了一个数据信息学习框架,用于预测 Plasmatron X 在未知压力和功率测试条件下的射流剖面。了解高焓流动(尤其是等离子体射流)动力学背后的物理学原理,是正确设计材料测试、执行诊断和开发精确模拟模型的关键。
Multi-domain analysis and prediction of inductively coupled plasma jet dynamics via high-speed imaging of visible light emission
Inductively coupled plasma wind tunnels are crucial for replicating hypersonic flight conditions in ground testing. Achieving the desired conditions (e.g., stagnation-point heat fluxes and enthalpies during atmospheric reentry) requires a careful selection of operating inputs, such as mass flow, gas composition, nozzle geometry, torch power, chamber pressure, and probing location along the plasma jet. The study presented herein focuses on the influence of the torch power and chamber pressure on the plasma jet dynamics within the 350 kW Plasmatron X ICP facility at the University of Illinois at Urbana-Champaign. A multi-domain analysis of the jet behavior under selected power-pressure conditions is presented in terms of emitted light measurements collected using high-speed imaging. We then use Gaussian Process Regression to develop a data-informed learning framework for predicting Plasmatron X jet profiles at unseen pressure and power test conditions. Understanding the physics behind the dynamics of high-enthalpy flows, particularly plasma jets, is the key to properly design material testing, perform diagnostics, and develop accurate simulation models.
期刊介绍:
Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.