高超声速目标烧蚀扩散物等离子体电磁特性研究

During the flight of hypersonic targets, the surface thermal protection and ablation cooling materials are produced by severe friction with the atmosphere, resulting in complex plasma sheath containing ablative and diffused particles. Such plasma has some randomness and dynamic characteristics. It will interact with the electromagnetic waves, which seriously affects the detection, identification and communication capabilities of hypersonic vehicles. In view of the electromagnetic characteristics of the ablative diffuser plasma, the systematic theoretical and experimental research is still lacking. The project combines the physicochemical properties and ablative mechanism of ablative diffuser to establish a flow-electromagnetic field integrated model of electromagnetic scattering characteristics, and reveals the flow-field around the hypersonic target and the propagation and scattering mechanism of electromagnetic waves. The ablative diffuser plasma is measured by grounded simulation research to obtain electromagnetic characteristics and dynamic database, which will lay a theoretical and experimental foundation for detection, identification and interception of hypersonic targets.

高超声速目标飞行过程中，表面的防热及烧蚀降温材料与大气剧烈摩擦产生含有烧蚀扩散物的复杂等离子体鞘套。这类等离子体存在一定的随机性和动态特性，会与电磁波发生复杂的相互作用，严重影响了高超飞行器的探测识别和通信能力。针对高超声速目标烧蚀扩散物等离子体的电磁特性，还缺乏系统地理论和实验研究。本项目结合烧蚀扩散物的物化特性及烧蚀机理，建立超高速烧蚀扩散物等离子体覆盖目标流场-电磁场一体化模型，揭示超高速目标绕流流场及电磁波传输、散射机理，并对烧蚀扩散物等离子体的电磁特性进行地面模拟测量，从而获取典型超高速目标电磁散射特性并建立动态电磁散射特性数据库，为高超声速目标的探测、识别和拦截奠定理论和实验基础。

高超声速目标飞行过程中，表面的防热及烧蚀降温材料与大气剧烈摩擦产生含有烧蚀扩散物的复杂等离子体鞘套。这类等离子体存在一定的随机性和动态特性，会与电磁波发生复杂的相互作用，严重影响了高超飞行器的探测识别和通信能力。针对高超声速目标烧蚀扩散物等离子体的电磁特性，本项目采用N-S/DSMC混合的流场方法以及SBR、场离散的MC等电磁场方法，结合烧蚀扩散物的物化特性及烧蚀机理，建立了高超声速目标烧蚀扩散物等离子体流场流场-电磁场一体化模型，揭示超高速目标绕流流场及电磁波传输、散射机理，并建立了基于管阵的等离子体电磁特性地面模拟测量系统，揭示了超高速目标激波等离子体对目标RCS起缩减以及增强作用的机理，从而获取典型超高速目标电磁散射特性并建立电磁散射特性数据库，为高超声速目标的探测、识别和拦截奠定理论和实验基础。