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取水槽内の空気吸込の発生について
https://doi.org/10.14988/pa.2017.0000012417
https://doi.org/10.14988/pa.2017.0000012417c02fb47d-d554-4097-aed8-965ae5d34bc6
名前 / ファイル | ライセンス | アクション |
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023052010001.pdf (378.5 kB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2011-06-06 | |||||
タイトル | ||||||
言語 | ja | |||||
タイトル | 取水槽内の空気吸込の発生について | |||||
タイトル | ||||||
言語 | ja-Kana | |||||
タイトル | シュスイ スイソウナイ ノ クウキ スイコミ ノ ハッセイ ニツイテ | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | On the occurrence of air entrainment in a suction sump | |||||
言語 | ||||||
言語 | jpn | |||||
キーワード | ||||||
主題 | ポンプ, 空気吸込, 渦, 吸込水槽, 取水口, 二相流 pumps, air entrainment, vortices, open sump, water intake, two-phase flow |
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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 | |||||
ID登録 | ||||||
ID登録 | 10.14988/pa.2017.0000012417 | |||||
ID登録タイプ | JaLC | |||||
アクセス権 | ||||||
アクセス権 | open access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
著者 |
平田, 勝哉
× 平田, 勝哉× 舟木, 治郎× 久保田, 義啓× 稲垣, 勝久× 田岡, 未樹 |
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著者所属 | ||||||
ja | ||||||
平田, 勝哉 / 同志社大学理工学部エネルギー機械工学科教授 | ||||||
著者所属 | ||||||
ja | ||||||
舟木, 治郎 / 同志社大学理工学部機械システム工学科准教授 | ||||||
著者所属 | ||||||
ja | ||||||
久保田, 義啓 / 同志社大学理工学部 | ||||||
著者所属 | ||||||
ja | ||||||
稲垣, 勝久 / 同志社大学理工学部 | ||||||
著者所属 | ||||||
ja | ||||||
田岡, 未樹 / 同志社大学理工学部 | ||||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | ポンプ吸込水槽の設計が不適当であると吸込管内部への空気吸込が発生し,それらは振動,騒音,さらには揚水不能という事態をもたらす.本研究では,空気吸込に関係した臨界没水深さScに着目して系統的な実験を行う.すなわち,力学パラメーターとして,ReとWe ,Frを考える.形状パラメーターとして,背面管隙Xと吸込水槽幅B,底面間隙Zを考える.ここで,代表長さと代表速度には,それぞれ,吸込管外径Dと吸込管入口速度Viを採用する.結果として,Scに及ぼす以上六パラメーターの影響を明らかにしている.We>12の範囲で,We効果は無視できる.Re>3×10[4]の範囲で,Re効果は無視できる.よって,これらの条件下では,Fr効果だけを考えれば充分である.X/D効果とB/D効果を考えると,どちらも,ある値でSc/Dが極大値をとる.一方,Z/D効果は単調であり,かつ,Z/D>2.5の範囲で小さくなる.これらの形状効果のいくつかは,Sc/DとFrとの関係に基づき,局所フルード数を考えることで説明できる.一方,他のいくつかは,吸込水槽内の流れを考慮する必要がある. | |||||
言語 | ja | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | In the present study, we consider the air entrainment into a suction pipe which is vertically inserted down into a suction sump across a mean free-water surface. This configuration is often referred to as the “vertical wet-pit pump", and has many practical advantages in construction, maintenance and operation. In particular, we focus our concern upon the critical submergence depth Sc, which is one of the prime and conventional indicators for the air-entrainment occurrence. By a systematic approach, we experimentally investigate the influences of kinetic and geometric parameters upon Sc. As the kinetic parameters, we consider the Reynolds number Re and the Weber number We, in addition to the Froude number Fr, on such a basis as Fr is not much larger than unity in many actual cases. As the geometric parameters, we consider back clearance X, sump breadth B and bottom clearance Z. Here, all parameters are non-dimensionalized by the outside diameter D and the intake velocity Vi of the suction pipe. As a result, we reveal the effects of such six parameters upon Sc. The We effect, namely, the surface-tension effect can be ignored at We > 12. And, the Re effect, namely, the viscous effect becomes negligibly small at Re > 3×10[4]. Under such conditions for We and Re, we could consider only the Fr effect, namely, the gravitational effect. Concerning the X/D and B/D effects, Sc/D attains the maximum at a certain X/D or B/D. On the other hand, the Z/D effect is monotonous, and becomes small at Z/D > 2.5. Some aspects of these geometric effects can be evaluated by a local-Froude-number effect on the basis of the global relation between Sc/D and Fr. And, the other aspects is necessarily considered to be related with the flow structure in the suction sump. | |||||
言語 | en | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 抄録の「3X10[4]」の[4]は上付き | |||||
言語 | ja | |||||
書誌情報 |
ja : 同志社大学理工学研究報告 en : The Science and Engineering Review of Doshisha University 巻 52, 号 1, p. 1-17, 発行日 2011-04-30 |
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出版者 | ||||||
言語 | ja | |||||
出版者 | 同志社大学理工学研究所 | |||||
出版者(英) | ||||||
言語 | en | |||||
出版者 | Science and Engineering Research Institute of Doshisha University | |||||
ISSN | ||||||
収録物識別子タイプ | PISSN | |||||
収録物識別子 | 00368172 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00165868 | |||||
権利者情報 | ||||||
権利者名 | 同志社大学理工学研究所 | |||||
言語 | ja | |||||
権利者名 | Science and Engineering Research Institute of Doshisha University | |||||
言語 | en | |||||
関連サイト | ||||||
関連タイプ | isFormatOf | |||||
識別子タイプ | URI | |||||
関連識別子 | https://doors.doshisha.ac.jp/opac/opac_link/bibid/SB00960326/?lang=0 | |||||
言語 | ja | |||||
関連名称 | 掲載刊行物所蔵情報へのリンク / Link to Contents | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
出版タイプ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
日本十進分類法 | ||||||
主題 | 518.13 |