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首页> 外文期刊>Journal of aerospace engineering >Electrostatic Precipitation in the Martian Environment
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Electrostatic Precipitation in the Martian Environment

机译：火星环境中的静电沉淀

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Because the Martian atmosphere is composed mainly of CO2, electrochemical conversion of CO2 to O-2 is one of the most efficient methods of extracting oxygen, which is indispensable for astronauts to breathe and can be used as an oxidant for rocket engines. In order to realize a reliable oxygen production system, a large amount of CO2 gas must be accumulated and compressed in an electrolytic conversion system. However, dust present in the Martian atmosphere because of dust storms could damage the oxygen conversion system or cause it to malfunction. Thus, a dust removal system is necessary before CO2 gas can be introduced into the system. To this end, an electrostatic precipitator suitable for use in the low-pressure Martian atmosphere has been developed. First, a precipitator consisting of a wire and parallel-plate electrodes was constructed. In a preliminary study, the efficiency of dust removal was 75%-80% without corona discharge, and almost no dust was collected at the corona discharge region in the low-pressure (700 Pa) CO2 atmosphere that simulated the Martian atmosphere. In this case, dust was collected on the surface of the wire electrode, contrary to the case for a pressure of 105 Pa (1 atm). The mechanism of these phenomena was investigated by direct observation and numerical calculation of particle motion in the precipitator. It was clarified that the low charge density of particles in the low-pressure atmosphere caused a relatively large dielectrophoresis force in comparison with the Coulomb force, and the particles were attracted to the wire electrode, i.e., the dielectrophoresis forces dominate in the low-pressure regime, whereas Coulomb forces dominate in the high-pressure regime. Poor performance in the low-pressure atmosphere was caused by the low charge density and low electrostatic field owing to the low limited voltage. Although the performance deteriorated rapidly in the low-pressure atmosphere because of the deposition of dust on the fine wire electrode, it was easy to vibrate the wire electrode and remove dust on the wire. (c) 2019 American Society of Civil Engineers.
机译：由于火星大气层主要由CO2组成，因此CO2电化学转化为O-2是提取氧气的最有效方法之一，这对于宇航员呼吸是必不可少的，并且可以用作火箭发动机的氧化剂。为了实现可靠的制氧系统，必须在电解转化系统中累积并压缩大量的CO2气体。但是，由于沙尘暴而出现在火星大气层中的灰尘可能会损坏氧气转换系统或导致其故障。因此，在将二氧化碳气体引入系统之前，必须有一个除尘系统。为此，已经开发了适用于低压火星大气的静电除尘器。首先，构造了由金属丝和平行板电极组成的除尘器。在初步研究中，没有电晕放电的除尘效率为75％-80％，并且在模拟火星大气的低压（700 Pa）CO2气氛下，电晕放电区域几乎没有收集到灰尘。在这种情况下，与压力为105Pa（1atm）的情况相反，灰尘聚集在线电极的表面上。通过直接观察和对除尘器中颗粒运动的数值计算，研究了这些现象的机理。明确了，与库仑力相比，低压气氛中的粒子的低电荷密度引起较大的介电泳力，并且粒子被吸引至线电极，即，介电电泳力在低压中占优势。库仑部队在高压政权中占主导地位。低压气氛中的不良性能是由于低极限电压导致的低电荷密度和低静电场引起的。尽管由于在细线电极上沉积灰尘而在低压气氛中性能迅速下降，但是容易使线电极振动并去除线上的灰尘。 （c）2019美国土木工程师学会。

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