基于引射技术的特种车辆尾气红外抑制特性研究

To effectively reduce the infrared radiation of the exhaust gas of special vehicles, the ejector technique is used to suppress the infrared radiation of the exhaust gas of special vehicles in this research. Firstly, based on a preliminary design of ejection device, the mathematical model of ejecting exhaust pipe will be established, and the turbulent flow fields of the exhaust gas outside and inside the exhaust system’s mixing chamber will be simulated through the numerical method. Secondly, by setting a threshold value, the computational area of the infrared radiation of exhaust gas will be defined, and the computational model of exhaust infrared radiation will be founded, then the spectral radiant luminance and intensity distribution of the infrared radiation of exhaust gas will be acquired with the numerical method. Whereafter, the model parameters of ejecting exhaust pipe will be changed, and a few of calculational results about exhaust gas will be obtained. Thus, all of computational results will be contrasted and analyzed to further optimize the structure of ejection device. Thirdly, according to the most optimized structure model of the exhaust pipe, the ejecting exhaust pipe will be manufactured, and the infrared suppression of exhaust gas by ejected air will be tested. Finally, the numerical calculation results will be compared with the test results to obtain some valuable conclusions. This research will explore the basic law of ejected air suppressing the infrared radiation of exhaust gas of special vehicles, which will lay the theoretical foundation for the realization of adopting ejector technology to suppress the infrared radiation of vehicles exhaust gas. The research results have great significance to enhancing infrared stealth of special vehicles, and furthermore provide the theory reference for the study about gas radiation in the aviation, aerospace and other fields.

为了能有效降低特种车辆尾气红外辐射，本课题拟采用引射技术抑制特种车辆尾气的红外辐射。首先，初步设计引射装置，建立引射排气管的数理模型，数值计算排气系统混合室内外尾气湍流场；其次，通过设定边界阈值，界定出尾气红外辐射计算区域，建立尾气红外辐射计算模型，数值求解尾气红外辐射，获得尾气红外辐射的光谱辐射亮度和强度分布，然后改变引射装置模型参数并计算其尾气红外特性，对比分析计算结果，优化引射装置结构；再次，根据最优化的引射排气管结构模型，加工引射排气管，进行引射空气抑制尾气红外辐射试验测试；最后，将数值计算结果与试验结果进行比较分析，探寻引射技术抑制特种车辆尾气红外辐射的基本规律，为实现引射技术在车辆尾气红外抑制中应用奠定理论基础。课题的研究结果不仅对全面提升特种车辆的红外隐身具有重要意义，也可为航空、航天以及其它领域有关气体辐射的研究提供理论参考。

为了能有效降低特种车辆尾气红外辐射，本课题采用引射技术抑制特种车辆尾气的红外辐射。首先，针对陕汽2190的排气系统，设计3种不同引射装置，并建立引射排气管的数理模型，数值计算排气系统混合室内外尾气湍流场；其次，用指定的尾气温度作为设定尾气辐射计算区域的阈值，并对区域进行简单的填补式修正，得到圆柱形核心辐射计算区域，建立尾气红外辐射计算模型，数值求解尾气红外辐射，获得原排气管和3种引射排气管的尾气红外辐射光谱辐射亮度和强度分布，对比分析计算结果，优化引射装置结构；再次，根据引射排气管结构模型，加工引射排气管，进行引射空气抑制尾气红外辐射试验测试；最后，将数值计算结果与试验结果进行了比较分析，验证了理论计算的可靠性和引射装置模型设计的合理性。研究结果表明：车辆排气系统采用了引射技术后，其尾气的红外辐射强度大大降低，最大降幅达到90%左右，有效抑制了特种车辆的红外辐射。为实现引射技术在特种车辆尾气红外辐射抑制中的应用奠定理论基础，完成了项目既定的研究目标。