JP2014084047A - 空力騒音低減装置 - Google Patents
空力騒音低減装置 Download PDFInfo
- Publication number
- JP2014084047A JP2014084047A JP2012236237A JP2012236237A JP2014084047A JP 2014084047 A JP2014084047 A JP 2014084047A JP 2012236237 A JP2012236237 A JP 2012236237A JP 2012236237 A JP2012236237 A JP 2012236237A JP 2014084047 A JP2014084047 A JP 2014084047A
- Authority
- JP
- Japan
- Prior art keywords
- air
- aerodynamic noise
- step portion
- port
- noise reduction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D35/00—Vehicle bodies characterised by streamlining
- B62D35/008—Side spoilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/002—Influencing flow of fluids by influencing the boundary layer
- F15D1/0025—Influencing flow of fluids by influencing the boundary layer using passive means, i.e. without external energy supply
- F15D1/0055—Influencing flow of fluids by influencing the boundary layer using passive means, i.e. without external energy supply comprising apertures in the surface, through which fluid is withdrawn from or injected into the flow
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/82—Elements for improving aerodynamics
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Body Structure For Vehicles (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
【解決手段】 空気流中に置かれた物体11,12の表面から段差部14が突出していると、段差部14の下流の空気流の剥離領域から空力騒音が発生するが、剥離領域におけるレイノルズ応力が最大になる位置に近接する段差部14に空気噴出口13dを開口させ、空気噴出口13dからレイノルズ応力が最大になる位置に向けて空気を噴出させることで、剥離領域の剥離剪断層の速度勾配を緩和してレイノルズ応力の最大値を減少させ、空力騒音を効果的に低減することができる。また段差部14に空気吸入口13cを開口させ、空気吸入口13cと空気噴出口13dとを連通路13eで連通させたので、空気吸入口13cから吸い込まれた空気が連通路13eを通って空気噴出口13dから噴出することで、空気噴出口13dから空気を噴出させるための特別の駆動源が不要になる。
【選択図】 図1
Description
u=uAV+u′
v=vAV+v′
で表される。即ち、X方向速度uは、X方向の時間的平均速度をuAVとX方向の変動速度u′との和で表され、Y方向速度vは、Y方向の時間的平均速度をvAVと、Y方向の変動速度v′との和で表される。
τ=−ρ・(u′・v′)AV
で表される。ここで、(u′・v′)AVは、X方向の変動速度u′とY方向の変動速度v′との積の時間的平均値であり、X方向の変動速度u′およびY方向の変動速度v′が所定の相関を持つ場合には、(u′・v′)AVはゼロにならないため、レイノルズ応力τが発生することになる。剥離領域における騒音源がレイノルズ応力τが最大になる位置で発生する乱流中の横渦であると想定し、X−Y平面内の流れ場のレイノルズ応力τを計算すれば、その値が最大になる部分を騒音源として特定することができる。
12 フロントピラー(物体)
13c 空気吸入口
13d 空気噴出口
13e 連通路
14 段差部
Claims (3)
- 空気流中に置かれた物体(11,12)の表面に突出する段差部(14)の下流の剥離領域から発生する空力騒音を低減する空力騒音低減装置であって、
前記剥離領域におけるレイノルズ応力が最大になる位置に近接する前記段差部(14)に空気噴出口(13d)を開口させ、前記空気噴出口(13d)から前記レイノルズ応力が最大になる位置に向けて空気を噴出させることを特徴とする空力騒音低減装置。 - 前記段差部(14)に空気吸入口(13c)を開口させ、前記空気吸入口(13c)と前記空気噴出口(13d)とを連通路(13e)で連通させたことを特徴とする、請求項1に記載の空力騒音低減装置。
- 前記空気噴出口(13d)からの空気の噴出速度は主流の流速の1/2以上であることを特徴とする、請求項1または請求項2に記載の空力騒音低減装置。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012236237A JP5896299B2 (ja) | 2012-10-26 | 2012-10-26 | 空力騒音低減装置 |
US14/059,769 US8882177B2 (en) | 2012-10-26 | 2013-10-22 | Aerodynamic noise reduction device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012236237A JP5896299B2 (ja) | 2012-10-26 | 2012-10-26 | 空力騒音低減装置 |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2014084047A true JP2014084047A (ja) | 2014-05-12 |
JP2014084047A5 JP2014084047A5 (ja) | 2015-02-19 |
JP5896299B2 JP5896299B2 (ja) | 2016-03-30 |
Family
ID=50546355
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2012236237A Expired - Fee Related JP5896299B2 (ja) | 2012-10-26 | 2012-10-26 | 空力騒音低減装置 |
Country Status (2)
Country | Link |
---|---|
US (1) | US8882177B2 (ja) |
JP (1) | JP5896299B2 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140273784A1 (en) * | 2013-03-13 | 2014-09-18 | Ford Global Technologies, Llc | Air extractor to reduce closing effort |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6265370U (ja) * | 1985-10-16 | 1987-04-23 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1512563A (fr) * | 1966-12-29 | 1968-02-09 | Renault | Dispositif pour réduire la résistance à l'avancement des véhicules automobiles |
US3635517A (en) * | 1968-08-24 | 1972-01-18 | Daimler Benz Ag | Installation for reducing the soiling of rear lights in motor vehicle bodies |
US4538851A (en) * | 1984-01-18 | 1985-09-03 | General Motors Corporation | Aerodynamic rear view mirror |
US6186886B1 (en) * | 1999-04-14 | 2001-02-13 | Midwest Research Institute | Vehicle cabin cooling system for capturing and exhausting heated boundary layer air from inner surfaces of solar heated windows |
US6273488B1 (en) * | 1999-05-03 | 2001-08-14 | Guardian Industries Corporation | System and method for removing liquid from rear window of a vehicle |
CA2387128A1 (en) * | 1999-11-01 | 2001-05-10 | Bestop, Inc. | Two-piece hardtop for a sport utility vehicle |
JP2003254226A (ja) | 2002-03-05 | 2003-09-10 | Ebara Corp | 風車の気流騒音低減装置 |
DE102006019777A1 (de) * | 2006-04-28 | 2007-11-08 | Daimlerchrysler Ag | Kraftwagenheck |
US7641275B2 (en) * | 2007-06-07 | 2010-01-05 | Toyota Motor Engineering & Manufacturing North America, Inc. | Pillar wind deflector |
US20090088065A1 (en) * | 2007-09-30 | 2009-04-02 | Ford Global Technologies, Llc | Air extractor to prevent wind throb in automobiles |
DE102009031250A1 (de) * | 2009-07-01 | 2011-01-05 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Kraftfahrzeug und Heckdeckel für ein Kraftfahrzeug |
DE102009039037A1 (de) * | 2009-08-28 | 2011-03-03 | Bayerische Motoren Werke Aktiengesellschaft | Kraftfahrzeug |
US8191955B2 (en) * | 2010-10-28 | 2012-06-05 | Henry August | Base drag reduction for road vehicles and ‘airdrop’ cargo aircraft |
-
2012
- 2012-10-26 JP JP2012236237A patent/JP5896299B2/ja not_active Expired - Fee Related
-
2013
- 2013-10-22 US US14/059,769 patent/US8882177B2/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6265370U (ja) * | 1985-10-16 | 1987-04-23 |
Also Published As
Publication number | Publication date |
---|---|
JP5896299B2 (ja) | 2016-03-30 |
US8882177B2 (en) | 2014-11-11 |
US20140117711A1 (en) | 2014-05-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP3081382B1 (en) | Liquid ejecting apparatus and liquid ejecting head | |
JP6277901B2 (ja) | 車両用エンジンの吸気装置 | |
US9327780B1 (en) | Aerodynamic bumper center deflector for a truck or tractor vehicle | |
JP5474151B2 (ja) | 車両用吸気ダクト | |
JP2009248928A (ja) | 車両用吸気ダクト | |
US9371098B2 (en) | Spoiler device for vehicle | |
JP2014125013A (ja) | 車両ホイールハウスの整流装置 | |
JP2011189831A (ja) | 自動車用サイドバイザー | |
US8763738B2 (en) | Front end structure for vehicle | |
US20130248141A1 (en) | Ducting arrangement and method for directing airflow toward a radiator | |
SE1050102A1 (sv) | Luftriktare och virvelgenerator och lastfordon försett med nämnda luftriktare | |
JP5896299B2 (ja) | 空力騒音低減装置 | |
JP6326884B2 (ja) | 車両のドアミラー | |
WO2010004889A1 (ja) | 車両の吸気構造 | |
JP2014084047A5 (ja) | ||
JP5879995B2 (ja) | 流体制御装置 | |
JP2017114356A (ja) | 吸気シュラウド構造 | |
JP6644977B2 (ja) | 空力部品 | |
JP4321063B2 (ja) | リヤフェンダパネル | |
KR20190001773A (ko) | 공기통로방식 휠 디플렉터 및 차량 | |
JP2014125132A (ja) | 自動車用導風ダクト及び自動車用導風板並びに自動車前部の導風構造 | |
JP6838495B2 (ja) | 車両後部構造 | |
JP2012126326A (ja) | 車両の側部車体構造 | |
JP2016055751A (ja) | 車両のアンダカバー構造 | |
JP5873370B2 (ja) | ウインドウウォッシャ装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20141127 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20141226 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20150813 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20150819 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20151013 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20160203 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20160218 |
|
R150 | Certificate of patent or registration of utility model |
Ref document number: 5896299 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
LAPS | Cancellation because of no payment of annual fees |