کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1717654 1520083 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Analysis of weakly ionized ablation plasma flows for a hypersonic vehicle
ترجمه فارسی عنوان
تجزیه و تحلیل جریانهای پلاسمای تخلیه یونیزاسیون ضعیف برای وسیله نقلیه هیپرسیونیک
کلمات کلیدی
جریان هوای فشرده، غلاف پلاسما، تخریب ویژگی پراکندگی الکترومغناطیسی، شبیه سازی عددی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی هوافضا
چکیده انگلیسی

Hypersonic vehicles are enveloped by a plasma sheath that affects the data transmission and object identification. This paper develops a numerical methodology based on Magnetohydrodynamics equations to study the electromagnetic environment of hypersonic vehicles under the condition of carbon-based thermal protection material ablation. A surface ablation model considering the oxidation and sublimation ablation process is coupled with a Navier–Stokes solver by a gas–solid interaction method to simulate the ablation plasma flows. A piecewise linear current density recursive convolution finite-difference time-domain method is applied to further analyze the interaction between the incident electromagnetic wave and the plasma sheath. The computational results for an HTV-2 type vehicle indicate that both ablation and non-ablation plasma sheaths have significant effects on the electromagnetic environment of the vehicle. Compared with a non-ablation plasma sheath, ablation results in a decrease in the number of electrons and increases the number of neutral particles and therefore changes characteristic parameters of the plasma. Details of the electromagnetic scattering characteristics are reported to highlight the influences of ablation on the reflectivity, penetrability, and absorptivity of the plasma sheath for incident electromagnetic waves over different bands.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aerospace Science and Technology - Volume 51, April 2016, Pages 151–161
نویسندگان
, , ,