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| EM Wave Propagation Characteristics in Plasma Sheath of Hypersonic Reentry Blunted Cone Body |
| Received:September 30, 2015 Revised:December 15, 2015 |
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| DOI：10.7643/issn.1672-9242.2015.06.002 |
| KeyWord:plasma sheath EM wave propagation FDTD hypersonic speed |
| Author | Institution |
| YIN Xiong |
Air Force Engineering University，Xi′ an ，China |
| ZHANG Hou |
Air Force Engineering University，Xi′ an ，China |
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| Abstract: |
| Objective To improve the communication and monitoring from the ground station to the vehicle. Methods The hypersonic flow field over the blunted cone under different flight conditions in near space was simulated thoroughly by the technology of computational fluid dynamics (CFD). Then the electromagnetic (EM) model of plasma sheath for the blunted cone was set up by making the conversion computation for the flow results through some related formulae. Finally, the propagation characteristics of EM waves interacting with plasma sheath were explored in-depth by using an improved shift-operator finite difference time-domain (SO-FDTD) method. The memory-minimized algorithm is applied to the method to save system memory and improve the calculation speed. The high efficiency and accuracy of the SO-FDTD method proposed in this paper were validated by comparing to analytical method and the SO-FDTD method proposed in the recent reference. Results The calculated results showed that the propagation characteristics of EM waves interacting with plasma sheath were closely correlated with the flight condition and the EM wave incidence state. It was shown that the propagation characteristics of EM wave in plasma sheath presented a turning change around the corresponding maximum plasma frequency. Compared to other incidence angles, the attenuation coefficient of EM wave through the tail region was weaker when the wave was perpendicular to the body surface. As the flight altitude increased or the flight speed decreased, the attenuation of EM wave propagation in plasma sheath can be reduced efficiently. Conclusion The conclusions obtained from this paper can provide the technical breakthroughs for the identification and monitoring of hypersonic near space vehicles and for the remission of the interruption of reentry communication. |
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