| Project/Area Number |
20246036
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Fluid engineering
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
KASAGI Nobuhide The University of Tokyo, 大学院・工学系研究科, 教授 (80107531)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Yuji 東京大学, 大学院・工学系研究科, 教授 (80222066)
FUKAGATA Koji 慶応義塾大学, 理工学部, 准教授 (80361517)
IWAMOTO Kaoru 東京農工大学, 大学院・工学研究院, 准教授 (50408712)
HASEGAWA Yosuke 東京大学, 大学院・工学系研究科, 助教 (30396783)
|
|---|
| Project Period (FY) |
2008 – 2010
|
| Project Status |
Completed (Fiscal Year 2010)
|
| Budget Amount *help |
¥49,660,000 (Direct Cost: ¥38,200,000、Indirect Cost: ¥11,460,000)
Fiscal Year 2010: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2009: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2008: ¥24,830,000 (Direct Cost: ¥19,100,000、Indirect Cost: ¥5,730,000)
|
|---|
| Keywords | 乱流 / 流体制御 / 能動制御 / 数値シミュレーション / MEMS |
|---|
| Research Abstract |
Facing the global issues such as depletion of energy resources and environmental deterioration, highly advanced technology of turbulence control is ever more needed. Turbulence control opens up new possibilities to achieve far greater efficiency and least environmental impact of various thermal-fluid systems supporting the human society through the manipulation and modification of momentum/heat/mass transfer, noise as well as chemical reaction. In the present study, we focused on one of the most canonical flows, i.e., wall turbulence and associated transport phenomena. We particularly aimed at developing innovative predetermined controls to drastically reduce skin friction drag and enhance heat/mass transfer. Specifically, we introduced new control indices such as the net energy saving rate and the control gain in order to evaluate cost effectiveness of existing control strategies and also a newly proposed traveling wave-like wall blowing/suction. We also applied uniform blowing/suction to a turbulent boundary layer to obtain general control strategies for spatially developing flows. For heat/mass transfer enhancement, we reexamined the governing equations and boundary conditions for the velocity and scalar fields in order to clarify possible scenarios for dissimilar heat transfer enhancement control. By applying the optimal control theory, we demonstrated that the dissimilar control is possible with a simple open-loop control strategy.
|
