An Investigation of parasite drag due to transonic junction flow and the low-drag design method.

• Project/Area Number: 16K18315
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Aerospace engineering
• Research Institution: Japan Aerospace EXploration Agency
• Principal Investigator: Yuhara Tatsunori 国立研究開発法人宇宙航空研究開発機構, 航空技術部門, 研究開発員 (90769895)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2016: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 遷音速 / 空力設計 / 航空機設計 / Junction Flow / Winglet

Outline of Final Research Achievements

This study investigates parasite drag due to junction flow occurring at the intersection of main wing and winglet and a design method to reduce the parasite drag. Cant angle and curved surface have higher sensitivity to profile drag at the intersection. Further investigation revealed that the reduction of thrust loop of section pressure distribution is an important factor. An inversed design method was applied to the intersection shape to increase the thrust loop.

Research Products

• [Journal Article] Verification of Optimum Spanwise Lift Distribution Design Method Applying VLM (2018)
  • Author(s): ODA Yuki、YUHARA Tatsunori、RINOIE Kenichi
  • Journal Title: JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES Volume: 66 Issue: 1 Pages: 31-38
  • DOI: 10.2322/jjsass.66.31
  • NAID: 130006337716
  • ISSN: 1344-6460, 2432-3691
  • Peer Reviewed
• [Presentation] Drag-Divergence Characteristics of Winglets (2018)
  • Author(s): Yuhara, T., Kubota, K., and Rinoie, K.,
  • Organizer: AIAA SciTech 56nd Aerospace Sciences Meeting
  • Int'l Joint Research
• [Presentation] 翼端形状における上反角と後退角の効果に関する考察 (2017)
  • Author(s): 小田祐樹，湯原達規，李家賢一
  • Organizer: 日本航空宇宙学会 第55回飛行機シンポジウム
• [Presentation] Studies on Wingtip Geometries by Optimum Spanwise Lift Distribution Design Method (2017)
  • Author(s): Oda, Y., Rinoie, K., and Yuhara, T.
  • Organizer: AIAA SciTech 55nd Aerospace Sciences Meeting
  • Place of Presentation: Grapevine, TX, USA
  • Int'l Joint Research
• [Presentation] 空力構造を考慮した翼端形状の変化に伴う主翼荷重分布の考察 (2016)
  • Author(s): 小田祐樹，湯原達規，李家賢一
  • Organizer: 日本航空宇宙学会 第47期年会講演会
  • Place of Presentation: 東京大学
• [Presentation] TRA2012Aへの実装に向けたSplit Tip Winglet の最適設計と重量評価 (2016)
  • Author(s): 田畑宗一郎，山崎渉，湯原達規
  • Organizer: 日本航空宇宙学会 第54回飛行機シンポジウム
  • Place of Presentation: 富山国際会議場
• [Presentation] 空力と構造を考慮した新規翼端形状の探索と評価 (2016)
  • Author(s): 小田祐樹，湯原達規，李家賢一
  • Organizer: 日本航空宇宙学会 第54回飛行機シンポジウム
  • Place of Presentation: 富山国際会議場