2012 Fiscal Year Final Research Report
Elucidation on constant Strouhal number behind 2-D bluff bodies
| Project/Area Number |
22560778
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Aerospace engineering
|
|---|
| Research Institution | Muroran Institute of Technology |
|---|
Principal Investigator |
TAKAGI Shohei 室蘭工業大学, 工学研究科, 教授 (10358658)
|
|---|
| Co-Investigator(Renkei-kenkyūsha) |
TEZUKA Asei 早稲田大学, 理工学院, 准教授 (50361506)
|
|---|
| Project Period (FY) |
2010 – 2012
|
| Keywords | 航空宇宙流体力学 |
|---|
| Research Abstract |
To identify the origin of Karman-vortex street behind 2-D bluff bodies, a new approach was established, which allows to alter the flow dominated by absolute instability from convective instability in subtle variation of the angle of attack of a small NACA0006 airfoil. This approach is based on the fact that the absolute instability is susceptible to the magnitude of separation near the trailing edge of airfoil. In the flow switched from convective to absolute instability at a certain angle of attack, velocity fluctuations abruptly growing with a selected frequency were observed at a certain location behind the airfoil. It could be concluded that the absolutely unstable region is located near this observed point.
|
