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Evaluation of Flow Quality in Newly Constructed Low-Turbulence Calibration Wind-Tunnel for Laser Velocimeters
https://jaxa.repo.nii.ac.jp/records/45313
https://jaxa.repo.nii.ac.jp/records/453139f416573-f5c3-4f85-b3bd-617786d0df41
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
naltr01054.pdf (991.5 kB)
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| Item type | テクニカルレポート / Technical Report(1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2015-03-26 | |||||||||
| タイトル | ||||||||||
| タイトル | Evaluation of Flow Quality in Newly Constructed Low-Turbulence Calibration Wind-Tunnel for Laser Velocimeters | |||||||||
| 言語 | en | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| 資源タイプ | ||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_18gh | |||||||||
| 資源タイプ | technical report | |||||||||
| その他のタイトル | ||||||||||
| その他のタイトル | レーザ流速計校正風洞の残留乱れと騒音測定及びその評価 | |||||||||
| 著者 |
高木, 正平
× 高木, 正平
× TAKAGI, Shohei
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| 著者所属 | ||||||||||
| 航空宇宙技術研究所空力性能部 | ||||||||||
| 著者所属（英） | ||||||||||
| en | ||||||||||
| Aircraft Aerodynamics Division, National Aerospace Laboratory(NAL) | ||||||||||
| 出版者 | ||||||||||
| 出版者 | 航空宇宙技術研究所 | |||||||||
| 出版者（英） | ||||||||||
| 出版者 | National Aerospace Laboratory(NAL) | |||||||||
| 書誌情報 |
航空宇宙技術研究所報告 en : Technical Report of National Aerospace Laboratory TR-1054 巻 1054, p. 12, 発行日 1990-02 |
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| 抄録（英） | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | A low-turbulence calibration wind-tunnel for laser velocimeters was newly constructed at NAL in the spring of 1988. Detailed flow-quality measurements in this facility have been successively achieved to obtain a better understanding of the characteristics of facility disturbances and identification of their sources, using two hot-wire anemometers, a microphone and an accelerometer. Experimental results show that overall residual turbulence levels in free-stream are 0.04％ and 0.06％ at fan speeds of 600 RPM and 1200 RPM, respectively. Extensive analyses of turbulence fluctuations show that the free-stream velocity is unexpectedly contaminated by acoustic disturbances, which are regarded as non-vortical fluctuations generated by fan blades and vibratory resonance of a portion of the wind-tunnel. Such pressure disturbances acoustically propagate into the flow direction. Cross-correlation measurements between two distant anemometers indicate that the contamination level reaches 70％ in the overall axial fluctuation energy at 600 RPM. It is estimated that the vortical turbulence level is about 0.022％ at this speed. | |||||||||
| ISSN | ||||||||||
| 収録物識別子タイプ | ISSN | |||||||||
| 収録物識別子 | 0389-4010 | |||||||||
| 資料番号 | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | 資料番号: NALTR1054000 | |||||||||
| レポート番号 | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | レポート番号: NAL TR-1054 | |||||||||
