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首页> 外文期刊>Review of Scientific Instruments >Characterization of Hall effect thruster propellant distributors with flame visualization
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Characterization of Hall effect thruster propellant distributors with flame visualization

机译：火焰可视化表征霍尔效应推进器推进剂分配器

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摘要

A novel method for the characterization and qualification of Hall effect thruster propellant distributors is presented. A quantitative measurement of the azimuthal number density uniformity, a metric which impacts propellant utilization, is obtained from photographs of a premixed flame anchored on the exit plane of the propellant distributor. The technique is demonstrated for three propellant distributors using a propane-air mixture at reservoir pressure of 40 psi (gauge) (377 kPa) exhausting to atmosphere, with volumetric flow rates ranging from 15-145 cfh (7.2–68 l/min) with equivalence ratios from 1.2 to 2.1. The visualization is compared with in-vacuum pressure measurements 1 mm downstream of the distributor exit plane (chamber pressure held below 2.7 × 10-5 Torr-Xe at all flow rates). Both methods indicate a non-uniformity in line with the propellant inlet, supporting the validity of the technique of flow visualization with flame luminosity for propellant distributor characterization. The technique is applied to a propellant distributor with a manufacturing defect in a known location and is able to identify the defect and characterize its impact. The technique is also applied to a distributor with numerous small orifices at the exit plane and is able to resolve the resulting non-uniformity. Luminosity data are collected with a spatial resolution of 48.2–76.1 μm (pixel width). The azimuthal uniformity is characterized in the form of standard deviation of azimuthal luminosities, normalized by the mean azimuthal luminosity. The distributors investigated achieve standard deviations of 0.346 ± 0.0212, 0.108 ± 0.0178, and 0.708 ± 0.0230 mean-normalized luminosity units respectively, where a value of 0 corresponds to perfect uniformity and a value of 1 represents a standard deviation equivalent to the mean.
机译：提出了一种新型的表征霍尔效应推进器推进剂分配器的方法。从锚固在推进剂分配器出口平面上的预混火焰的照片获得了对方位数密度均匀性（影响推进剂利用率的度量）的定量测​​量。该技术已在三个推进剂分配器上得到证明，该丙烷分配器使用丙烷-空气混合物，储气罐压力为40 psi（表压）（377 kPa），排入大气，体积流量为15-145 cfh（7.2-68 l / min），当量比从1.2到2.1。将可视化与分配器出口平面下游1 mm的真空内压力测量值进行比较（在所有流速下，室压保持在2.7×10 -5 Torr-Xe以下）。两种方法都表明与推进剂入口一致，这支持了具有火焰光度的流动可视化技术对推进剂分配器表征的有效性。该技术被应用于在已知位置具有制造缺陷的推进剂分配器，并且能够识别缺陷并表征其影响。该技术还应用于出口平面上有许多小孔的分配器，并且能够解决由此产生的不均匀性。收集的光度数据的空间分辨率为48.2-76.1μm（像素宽度）。方位均匀性以方位发光度的标准偏差形式表示，并通过平均方位发光度进行归一化。所调查的发行商分别获得0.346±0.0212、0.108±0.0178和0.708±0.0230平均标准化光度单位的标准偏差，其中0值表示完美均匀度，而1值表示等于平均值​​的标准偏差。

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