Influences of distributed surface roughness of small roughness-Reynolds-number on boundary-layer instability and transition

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560974
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Aerospace engineering
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: ASAI Masahito 首都大学東京, システムデザイン研究科, 教授 (00117988)
• Co-Investigator(Kenkyū-buntansha): INASAWA Ayumu 首都大学東京, システムデザイン研究科, 准教授 (70404936)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 流れの安定性 / 壁面粗さ / 境界層 / 乱流遷移

Outline of Final Research Achievements

Influences of distributed surface roughness on boundary-layer instability and transition were examined experimentally by using simple corrugation models of sinusoidal geometry with various corrugation amplitudes and wavelengths. In contrast to strong destabilizing effect of 2-D corrugation, 3-D corrugation had only a small influence on the boundary-layer instability. The distinct difference in the influence of 2-D and 3-D corrugations on the boundary-layer instability was further clarified for oblique surface corrugations. Influences of surface imperfection of small step-size were also demonstrated through numerical simulations and experiments.

Free Research Field

流体力学