WEKO3
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アイテム
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This study contributes to the optimistic design of velve and to the decrease of cavitation noise by studying the internal flow of the calve in the transient process of closing and opening. First, at Reynolds number of about 10 ^3, for poppet valves with different configurations, we have carried out noise tests and numerically simulated oil-flows under an assumption of noncavitating conditions by a finite difference method. In addition, we have performed the measurements of pressure at two locations in a valve chamber, the flow visualization and noise tests. By comparison of the measured and computed results, good correspondences between the flow pattern and noise measurements were obtained. It is confirmed that the noise is mainly generated from cavitation and strongly depends on the valve configuration of the poppets and the sleeves. A large valve chamber is effective to suppress cavitation due to the formation of a stationary large circulating flow, and the second stage restrictors is effective to reduce the pressure fluctuation by suppressing the generation of periodic vortiodic vortices. On the other hand in the case of expansion valve, simulation were made for both laminar and turbulent (kappa-epsilon turbulence model) flows. For laminar flow, strong vortex street was observed to shed along the axis of chamber downstream the poppet and pressure fluctuation also increases, while for turbulent flow by kappa-epsilon turbulence model, the jet flow separated from the poppet gets reattached over chamber walls, resulting in the formation of recirculation region just behind the poppet and the decrease of pressure fluctuation. These results agree well with visualization. Second, for spool valve, nomerical simulations were conducted for various valve configuration. The static characteristics at various valve open/close ratios and dynamic characteristics in the transient process of opening and closing operation, such as flow patterns, axial forces and angles of jet were computed. For static characteristics, fluid forces change, greatly corresponding with the flow direction through the valve and the associated recirculation region. For dynamic characteristics, unsteady flow patterns, force fluctuations in the transient process of closing and opening operations were numerically simulated. Correspondence between the vortices formed from valve shoulder and the fluctuating component of fluid forces with high frequency was certified. In experiments, both actual valves and valve-models with half size of actual one were employed. Axial forces at various valve open/cose ratios were measured using a load cell. The measured results agree well with those of simulations. In addition, flow-patterns visualized with the half size model were found to agree quantiatively well with those of simulations. 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"Cavitation", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Control Valve of Oil Hydraulics", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Finite Volume Method", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Noise Reduction", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Shape of Valve", "subitem_subject_language": "en", "subitem_subject_scheme": "Other"}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "jpn"}]}, "item_resource_type": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"resourcetype": "research report", "resourceuri": "http://purl.org/coar/resource_type/c_18ws"}]}, "item_title": "油圧制御弁の騒音低減化のための弁内圧力変動測定と流動数値シミュレーション", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "油圧制御弁の騒音低減化のための弁内圧力変動測定と流動数値シミュレーション"}, {"subitem_title": "Numerical Simulations and Pressure Measurements of the Flow of an Oily Control Valve for Decreasing its Operating Noise", "subitem_title_language": "en"}]}, "item_type_id": "9", "owner": "18", "path": ["2838"], "permalink_uri": "https://doi.org/10.24517/00049367", "pubdate": {"attribute_name": "公開日", "attribute_value": "2017-12-11"}, "publish_date": "2017-12-11", "publish_status": "0", "recid": "43018", "relation": {}, "relation_version_is_last": true, "title": ["油圧制御弁の騒音低減化のための弁内圧力変動測定と流動数値シミュレーション"], "weko_shared_id": -1}
油圧制御弁の騒音低減化のための弁内圧力変動測定と流動数値シミュレーション
https://doi.org/10.24517/00049367
https://doi.org/10.24517/00049367b3ac9ee9-48c5-4d5f-8506-085fa4361b42
名前 / ファイル | ライセンス | アクション |
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TE-PR-OKAJIMA-A-kaken 1996-6p.pdf (230.5 kB)
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Item type | 報告書 / Research Paper(1) | |||||
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公開日 | 2017-12-11 | |||||
タイトル | ||||||
タイトル | 油圧制御弁の騒音低減化のための弁内圧力変動測定と流動数値シミュレーション | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Numerical Simulations and Pressure Measurements of the Flow of an Oily Control Valve for Decreasing its Operating Noise | |||||
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_18ws | |||||
資源タイプ | research report | |||||
ID登録 | ||||||
ID登録 | 10.24517/00049367 | |||||
ID登録タイプ | JaLC | |||||
著者 |
岡島, 厚
× 岡島, 厚 |
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著者別表示 |
Okajima, Atsushi
× Okajima, Atsushi |
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書誌情報 |
平成7(1995)年度 科学研究費補助金 一般研究(C) 研究成果報告書 en : 1995 Fiscal Year Final Research Report 巻 1993-1995, p. 6p., 発行日 1996-03 |
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出版者 | ||||||
出版者 | 金沢大学大学院自然科学研究科 | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | 本研究は、弁の低騒音化に対し、流れから見た最適な弁設計指針を得ようとするものである。まず、ポペット形弁に関しては、4種類の弁形状についてレイノルズ数約10^3で数値シミュレーション及び騒音試験を行い、流動パターンと騒音試験結果と良い一致を見出した。両者の結果から、騒音の主因はキャビテーションによって生じ、騒音強さはポペット及びスリーブの形状に強く依存して変化することが分かった。また、大きい弁室形状はキャビテーション抑制に役立ち、さらに2段絞りは周期的渦発生を抑制することによって圧力変動の減少に効果的である。一方、膨張弁の場合、頂部が切り落とされたポペットによる縮小流れとして、種々の弁開度に対し、層流および乱流(k-ε法)の場合につき数値計算を行った。層流では、ポペット下流の中心軸に沿って強い渦列の放出が見られ、圧力変動も大きくなる。k-ε法よれば、ポペット頂部から剥離したジェットは弁室壁に再付着する結果、ポペット直後に再循環領域が現れ、弁室圧力変動も小さくなる。これらの結果は可視化実験とも比較され、良い対応を得た。次に、スプール弁に関して、種々の弁形状における流れの数値流動シミュレーショを行い、各弁開度における静的な特性、そして弁が開閉運動する時の流れパターン、軸力およびジェットの流出入角度の変動などの動的な特性を明らかにした。静的な特性としては、弁の流入方向の正逆によって流動パターン(再循環領域の大きさ)が変化し、ジェット流出入角度が異なり、流体力の大きさが異なることを見いだした。さらに、弁ポートのラップ量管理のため一般に弁ポート端には中ぐり加工が施されているが、この加工深さの軸力や流れ挙動に及ぼす影響を明らかにした。さらに動的な特性として、弁体が開閉運動する際の非定常動動パターン、流動力変動を計算し、弁角部から生成する渦と高周波の流動力の流動成分との対応を明らかにした。実験は実物弁と半割モデル弁模型を用い、数種の弁開度に対する軸力をロードセルで測定し、数値計算結果と比較した結果、良い一致を見た。半割モデルによる流れの可視化や騒音測定も行い、実験結果と比較して、シミュレーション結果は定量的にもかなり良い結果を得、数値シミュレーションは層流、軸対称流れを仮定しているが、ポペット弁やスプール弁の弁運動する場合、弁内流動シミュレーションにも十分適用できる数値シミュレーション法を確立した。以上の結果は、関連学会で5編の発表論文として公表した。 | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The valve noise due to cavitation has frequently been serious problems with the increase of an operating pressure. This study contributes to the optimistic design of velve and to the decrease of cavitation noise by studying the internal flow of the calve in the transient process of closing and opening. First, at Reynolds number of about 10 ^3, for poppet valves with different configurations, we have carried out noise tests and numerically simulated oil-flows under an assumption of noncavitating conditions by a finite difference method. In addition, we have performed the measurements of pressure at two locations in a valve chamber, the flow visualization and noise tests. By comparison of the measured and computed results, good correspondences between the flow pattern and noise measurements were obtained. It is confirmed that the noise is mainly generated from cavitation and strongly depends on the valve configuration of the poppets and the sleeves. A large valve chamber is effective to suppress cavitation due to the formation of a stationary large circulating flow, and the second stage restrictors is effective to reduce the pressure fluctuation by suppressing the generation of periodic vortiodic vortices. On the other hand in the case of expansion valve, simulation were made for both laminar and turbulent (kappa-epsilon turbulence model) flows. For laminar flow, strong vortex street was observed to shed along the axis of chamber downstream the poppet and pressure fluctuation also increases, while for turbulent flow by kappa-epsilon turbulence model, the jet flow separated from the poppet gets reattached over chamber walls, resulting in the formation of recirculation region just behind the poppet and the decrease of pressure fluctuation. These results agree well with visualization. Second, for spool valve, nomerical simulations were conducted for various valve configuration. The static characteristics at various valve open/close ratios and dynamic characteristics in the transient process of opening and closing operation, such as flow patterns, axial forces and angles of jet were computed. For static characteristics, fluid forces change, greatly corresponding with the flow direction through the valve and the associated recirculation region. For dynamic characteristics, unsteady flow patterns, force fluctuations in the transient process of closing and opening operations were numerically simulated. Correspondence between the vortices formed from valve shoulder and the fluctuating component of fluid forces with high frequency was certified. In experiments, both actual valves and valve-models with half size of actual one were employed. Axial forces at various valve open/cose ratios were measured using a load cell. The measured results agree well with those of simulations. In addition, flow-patterns visualized with the half size model were found to agree quantiatively well with those of simulations. With the assumption of laminar, axial symmetric flow, t. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 研究課題/領域番号:05650161, 研究期間(年度):1993-1995 | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 出典:「油圧制御弁の騒音低減化のための弁内圧力変動測定と流動数値シミュレーション」研究成果報告書 課題番号05650161 (KAKEN:科学研究費助成事業データベース(国立情報学研究所)) 本文データは著者版報告書より作成 |
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著者版フラグ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
関連URI | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://kaken.nii.ac.jp/search/?qm=80013689 | |||||
関連名称 | https://kaken.nii.ac.jp/search/?qm=80013689 | |||||
関連URI | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05650161/ | |||||
関連名称 | https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05650161/ | |||||
関連URI | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-05650161/056501611995kenkyu_seika_hokoku_gaiyo/ | |||||
関連名称 | https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-05650161/056501611995kenkyu_seika_hokoku_gaiyo/ |