{"title":"Numerical Analysis of a Multi-Species MHD Model for Plasma Layer Control of Re-Entry Vehicles","authors":"F. Dias, José C. Páscoa, C. Xisto","doi":"10.1115/IMECE2018-87467","DOIUrl":null,"url":null,"abstract":"Several critical aspects control the successful reentry of vehicles on the earth’s atmosphere: continuous communication, GPS signal reception and real-time telemetry. However, there are some common issues that can interfere with the instruments operation, the most typical being the radio blackout, in which the plasma layer frequency modifies the electromagnetic waves in a way that makes communications to and from the spacecraft impossible. So far, there have been several proposed techniques to mitigate radio blackout, one of which is the usage of electromagnetic fields. Previous studies have proven the effectiveness of the usage of an electric and/or magnetic fields to manipulate plasma layers. Experiments on plasma layer manipulation during hypersonic flight regime are extremely costly. Therefore, there has been a continuous interest in the development of cheaper solutions, that can guarantee a reliable degree of accuracy, such as the development of complex multiphysics computational models. These models are becoming increasingly realistic and accurate, as more and more physical aspects can be considered, greatly increasing the accuracy and range of models. However, those models need to be validated with recourse to experimental data. In this paper we propose a model that uses a Low Magnetic Reynolds number, and accounts for five common neutral species: N2, O2, NO, N and O, along with several of their respective reactions: dissociation of molecular nitrogen and oxygen, and exchange. The model chemistry is then validated based on experimental data gathered by several authors.","PeriodicalId":119220,"journal":{"name":"Volume 1: Advances in Aerospace Technology","volume":"156 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Volume 1: Advances in Aerospace Technology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1115/IMECE2018-87467","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
Several critical aspects control the successful reentry of vehicles on the earth’s atmosphere: continuous communication, GPS signal reception and real-time telemetry. However, there are some common issues that can interfere with the instruments operation, the most typical being the radio blackout, in which the plasma layer frequency modifies the electromagnetic waves in a way that makes communications to and from the spacecraft impossible. So far, there have been several proposed techniques to mitigate radio blackout, one of which is the usage of electromagnetic fields. Previous studies have proven the effectiveness of the usage of an electric and/or magnetic fields to manipulate plasma layers. Experiments on plasma layer manipulation during hypersonic flight regime are extremely costly. Therefore, there has been a continuous interest in the development of cheaper solutions, that can guarantee a reliable degree of accuracy, such as the development of complex multiphysics computational models. These models are becoming increasingly realistic and accurate, as more and more physical aspects can be considered, greatly increasing the accuracy and range of models. However, those models need to be validated with recourse to experimental data. In this paper we propose a model that uses a Low Magnetic Reynolds number, and accounts for five common neutral species: N2, O2, NO, N and O, along with several of their respective reactions: dissociation of molecular nitrogen and oxygen, and exchange. The model chemistry is then validated based on experimental data gathered by several authors.
几个关键方面控制着飞行器成功重返地球大气层:连续通信、GPS信号接收和实时遥测。然而,有一些常见的问题会干扰仪器的操作,最典型的是无线电中断,在这种情况下,等离子体层的频率改变了电磁波,使与航天器的通信变得不可能。到目前为止,已经提出了几种缓解无线电停电的技术,其中之一是使用电磁场。以前的研究已经证明了使用电场和/或磁场来操纵等离子体层的有效性。高超声速飞行过程中等离子体层操纵的实验非常昂贵。因此,人们一直对开发更便宜的解决方案感兴趣,这些解决方案可以保证可靠的准确性,例如开发复杂的多物理场计算模型。这些模型变得越来越逼真和准确,因为越来越多的物理方面可以考虑,大大提高了模型的准确性和范围。然而,这些模型需要借助实验数据进行验证。在本文中,我们提出了一个使用低磁雷诺数的模型,并考虑了五种常见的中性物质:N2, O2, NO, N和O,以及它们各自的几种反应:分子氮和氧的解离和交换。然后根据几位作者收集的实验数据对模型化学进行验证。