並列タイトル等Measurements of Pressure and Velocity Fluctuations in Jet Mixing Region Related to Jet Noise
タイトル（掲載誌）航空宇宙技術研究所報告 = Technical Report of National Aerospace Laboratory TR-451
一般注記Pressure and velocity fluctuations in the mixing region of jet flow issuing from a nozzle with a diameter of 30 mm were measured by employing probe tube microphones and hot wire anemometers, and large scale pressure fluctuations in the jet closely related to noise generation were examined. A special calibration test on the error due to the cross flow component of dynamic pressure fluctuations which the pressure probe detected was made in a jet flow generated by an inclined rotating nozzle and the allowable limit of the ratio of static pressure fluctuation to dynamic pressure fluctuation in a turbulent flow for which the probe can be applied was clarified. The measurements were mainly made traversing the flow at two diameters downstream from the nozzle exit at the exit velocity of 20m/sec. Intensity profiles were obtained for pressure and velocity fluctuation, and space-time correlation, power spectra, cross power spectra and coherence at a few selected locations for pressure-pressure, pressure-velocity and velocity-velocity fluctuation. In addition, the same measurements were made on the modified flow by applying wire screens and foil cylinders to the nozzle and the results were compared with those of the pure jet.
資料番号: NALTR0451000
レポート番号: NAL TR-451
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
提供元機関・データベース宇宙航空研究開発機構 : 宇宙航空研究開発機構リポジトリ