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アイテム
動壓利用による發動機の性能
https://jaxa.repo.nii.ac.jp/records/35534
https://jaxa.repo.nii.ac.jp/records/3553404412fed-e6bf-4bfc-a139-5cb63ac1e884
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
SA4148621.pdf (540.4 kB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||
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| 公開日 | 2015-03-26 | |||||||||
| タイトル | ||||||||||
| タイトル | 動壓利用による發動機の性能 | |||||||||
| 言語 | ||||||||||
| 言語 | jpn | |||||||||
| 資源タイプ | ||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||
| 資源タイプ | departmental bulletin paper | |||||||||
| その他のタイトル（英） | ||||||||||
| その他のタイトル | On the Characteristics of an Aero-Engine availing itself of Dynamic Pressure due to Air Speed. | |||||||||
| 著者 |
西脇, 仁一
× 西脇, 仁一
× NISIWAKI, Niiti
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| 出版者 | ||||||||||
| 出版者 | 東京帝國大學航空研究所 | |||||||||
| 出版者（英） | ||||||||||
| 出版者 | Aeronautical Research Institute, Tokyo Imperial University | |||||||||
| 書誌情報 |
東京帝國大學航空研究所報告 en : Report of Aeronautical Research Institute, Tokyo Imperial University 巻 18, 号 236, p. 225-241, 発行日 1942-07 |
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| 抄録（英） | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | A large number of modern airplanes avail themselves of dynamic pressure due to air speed with the object of increasing the rated altitude and of improving the performance of the airplane. Although numerous researches have been made in connexion with this problem, the author restricts himself here to a presentation of a few points that came to mind. 1. The effect of dynamic pressure on the suction pressure of the supercharger. From papers published on the subject thus far, it appears to be accepted that the whole of the dynamic pressure changes into static pressure and thus increase the boost pressure, but what can thus be utilized as static pressure is only a part of the dynamic pressure, it being impossible for the whole of the dynamic pressure to be utilized. In connexion with this problem S. Ries proposed the following formula for the air-intake efficiency: η_α=pressure rise in duct in front of supercharger/dynamic pressure [numerical formula] The author, however, prefers to write the above equation as follows: [numerical formula], where w_z=speed of airplane, w_z=velocity of propeller slip stream, w_z=velocity of suction air in front of supercharger, C_r.=resistance coefficient of duct in front of supercharger. Further, the approximate values of the temperature of the suction air in front of supercharger, and the density p_z are [numerical formula] where [numerical formula] 2. Δp_d, the increase in the delivery pressure of supercharger due to the use of dynamic pressure. The rise of boost pressure Δp_d is calculated by means of the formula [numerical formula] where R is the pressure ratio of supercharger. 3. FP', the horse power of the engine when the condition of the suction air. has slightly changed. [numerical formula] In the above equation, FP_z is the horse power when the dynamic pressure is not used, whence [numerical formula] where [numerical formula] is the increase in pressure of suction air when dynamic pressure is used, and -Δp_2 is the decrease in atmospheric pressure resulting from an increase of Δ_z metre in the supercharged height. [numerical formula] where Δt_1 is the rise in temperature of the suction air due to dynamic pressure, and -Δt_2 is the decrease in atmospberic temperature due to increase in rated altitude. The third term of the above formula corrects the change in horse power due to back pressure, resulting from the fact that the rated altitude increases as much as Δ_z, in consequence of which the atmospheric pressure decreases as much as Δp_z. 4. The change in rated altitude when dynamic pressure is used. In order to obtain an increase in the rated altitude Δ_z when dynamic pressure has been used and when the delivery pressure of the supercharger has been kept constant, the approximate calculation is [numerical formula]. | |||||||||
| 書誌レコードID | ||||||||||
| 収録物識別子タイプ | NCID | |||||||||
| 収録物識別子 | AA00387631 | |||||||||
| 資料番号 | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | 資料番号: SA4148621000 | |||||||||
