STUDY ON EXPLANATION OF DIGITAL IMAGE-PRESSURE MEASUREMENT TECHNOLOGY AND SELF-EXITED OSCILLATION OF FLOW WITH SHOCK WAVES BY THE WAY

数字图像压力测量技术及激波自激流动的解释研究

• 批准号: 14550165
• 负责人: KOJIMA Tadatomo
• 金额: $ 1.54万
• 依托单位: KINKI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550165/
• 关键词: Aerodynamic Acoustics; Shock Wave; Digital Image Processing; Unsteady Flow; Jet Noise; Flow Induced Vibration; Flow Visualization; 超音速噴流

In this study, the relation between vibration the self-induced oscillation and noise of jet flow issuing from divergent nozzle were studied by the flow visualization, pressure measurement and noise measurement. The instantaneous flow visualization were taken by schlieren method. The pressure fluctuation of total pressure was measured by a pressure transducer assembled into a total pressure probe and further, the noise of sound pressure level for the linear scale was measured. The frequency of the pressure and noise was analyzed by FFT analyzer. As a result, it was found that the jet noise was influenced by the total pressure fluctuation. Furthermore, the structure of the shock wave occurred in the two dimensions pipe of a muffler model for automobile was studied. The density distribution chart that was obtained by numerical simulation was compared to the visualization photograph by the schlieren method. The distribution of the pressure, density, speed of flow in each muffler was investigated, and shock wave structure was illuminated. As the result, the differences of the shock wave structure action and decrease of each model were clarified.

本文通过流动显示、压力测量和噪声测量，研究了扩张喷嘴喷流的振动、自激振荡和噪声之间的关系。采用纹影法进行瞬时流动显示。利用总压探头中的压力传感器测量总压的压力波动，进而测量线性标尺的声压级噪声。利用快速傅立叶变换分析仪对压力和噪声的频率进行分析。结果表明，射流噪声受总压脉动的影响。在此基础上，研究了汽车消声器模型二维管内激波的结构。将数值模拟得到的密度分布图与纹影法拍摄的可视化照片进行了比较。研究了各消声器内的压力、密度、速度分布，阐明了激波结构。明确了各模型激波结构作用和减量的差异。

项目成果

Tadatomo KOJIMA: "Relation between vibration the self-induced oscillation and noise of jet flow issuing from divergent nozzle"METALLURGICAL AB STRACTS ON LIGHT METALS AND ALLOYS. Vol.XXXV. 204-206 (2002)

Tadatomo KOJIMA：“振动、自激振荡与从发散喷嘴发出的射流噪声之间的关系”轻金属和合金冶金 AB 理论。

児島忠倫: "広がりノズルからの自励振動とジェット騒音との関連性"可視化情報学会誌. Vol.22, No.1. 475-478 (2002)

小岛忠森：“扩散喷嘴的自激振动与射流噪声之间的关系”可视化信息学会杂志，第 22 卷，第 475-478 期（2002 年）。

児島忠倫他1名: "非対称性超音速噴流の自励振動と擬似衝撃波構造の解明"近畿大学工業技術研究報告書. 2. 22-26 (2002)

Tadamichi Kojima 等 1：“非对称超音速喷气机的自激振动和伪冲击波结构的阐明”近畿大学工业技术研究报告。

Tadatomo KOJIMA: "Study on Self-Exited Oscillation and Structure of Pseudo-Shock Waves of Asymmetric Supersonic Jet"近畿大学工学部研究報告. No.36. 139-143 (2002)

小岛忠友：“非对称超音速射流的自激振荡和伪激波结构的研究”近代大学工学部研究报告第36号（2002年）。

児島忠倫他2名: "擬似衝撃波を伴う流れの自励振動とジェット騒音との関連性"日本機械学会中国四国支部講演会講演論文集. No.35-1. 133-134 (2002)

小岛忠守等2人：“伴随伪冲击波的流动的自激振动与喷射噪声的关系”日本机械工程学会中国四国分会会议记录第35-134号（2002年）。 ）