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首页> 外文会议>AIAA Aerospace Sciences Meeting;AIAA SciTech Forum >Investigation of Pyrolyzing Ablators Using a Gas Injection Probe
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Investigation of Pyrolyzing Ablators Using a Gas Injection Probe

机译：使用气体注入探针研究热解烧蚀剂

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The pyrolysis mechanism of Phenolic Impregnated Carbon Ablator (PICA) makes it a viable candidate for thermal protection systems for spacecraft atmospheric entry. However, a better understanding of the pyrolysis mechanism and of the interaction of the pyrolysis gases with the plasma flow is needed to improve heat-shield designs. The present study extends previous work in the design, development, and testing of a gas-injection probe to simulate pyrolysis in the UVM 30kW Inductively Coupled Plasma (ICP) Torch Facility. A parallel effort in Computational Fluid Dynamics (CFD) modeling of the injection probe during plasma testing is also discussed. Measurements were obtained with the injection probe in the facility in an argon buffered nitrogen condition with carbon dioxide being injected into the flow through a Fiber Form plug. Spatially resolved high-resolution emission data were acquired during this test. Spectral signatures of CN, OH, and NH bands were detected and their spatial locations determined using a spectrometer equipped with a CCD camera at the exit plane. At the same time the relative conditions in the facility were used to create a CFD model of the experiment. Comparisons between the measured, spatially resolved, emission spectra and the simulations calculated using a radiative transport model from the CFD results show reasonable agreement.
机译：酚醛浸渍碳烧蚀剂（PICA）的热解机理使其成为航天器大气进入热保护系统的可行候选者。但是，需要对热解机理以及热解气体与等离子体流的相互作用有更好的了解，以改善隔热板的设计。本研究扩展了先前设计，开发和测试气体注入探针以模拟UVM 30kW电感耦合等离子体（ICP）炬管中的热解的工作。还讨论了在等离子体测试过程中对注入探针进行的计算流体动力学（CFD）建模中的并行工作。使用设备中的注入探针在氩气缓冲的氮气条件下进行测量，并将二氧化碳通过“纤维状”塞子注入流中。在此测试中获取了空间分辨的高分辨率发射数据。检测CN，OH和NH谱带的光谱特征，并使用在出口平面配备CCD摄像机的光谱仪确定其空间位置。同时，将设施中的相对条件用于创建实验的CFD模型。测量的，空间分辨的，发射光谱与根据CFD结果使用辐射传输模型计算的模拟之间的比较显示出合理的一致性。

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