STUDY ON DEVELOPMENT OF THE DIGITAL IMAGE-PRESSURE MEASUREMENT TECHNOLOGY OF UNSTEADY FLOW AND THE STRUCTURE OF SHOCK WAVES BY CFD

为发展超音速流动非规则测压技术，应用数码相机开发可视化图像测量技术，应用CFD技术研究非定常流动现象、激波振荡现象，开展了部分研究工作。特别是，为了解决数字可视化图像处理系统和流场数字图像的研究，应用CFD对超音速喷流中的激波结构和自激振荡进行了研究。此外，为了了解噪声的产生来源与激波自激振荡流动的关系，应用数字可视化图像测量技术、非规则压力测量技术，对压力振动和数字噪声的频率进行了分析，取得了一定的研究成果。结果表明，实验阐明了Coanda效应的结构，数值分析阐明了Coanda效应的行为。此外，还采用了几种内部结构较为简单的消声器模型，对冲击波的传播进行了数值分析。

For the purpose of the development of non-regular pressure measurement technology on supersonic flow, the development of visualization image measurement technology by the application of the digital camera, and for study on the flow phenomenon of unsteady flows, the oscillating phenomenon of shock waves by the application of CFD, the part of research has been done. Especially, in order to solve the study on digital visualization image processing establishment system and the digital images in flow field, the shock wave structure in a supersonic jet flow and the self-excited oscillation were was subjected to be done by the application of CFD. Furthermore, for that make it understood about the relation between generation source of the noise and the self-excited oscillation flow with shock wave, the analyses on the frequency of pressure vibration and digital noise were done through the application of digital visualization image measurement technology, non-regular pressure measurement technology, and a certain amount research was able to be obtained. As a result, the structure of the Coanda effect was clarified by the experiment and its behavior was clarified by the numerical analysis. Moreover numerical analysis of the propagation of shock waves was carried out using several different silencer models with internal structures of comparatively simple numerical analysis.