What is turbulent control? 1) What is turbulence? Have you ever heard the word "turbulence"? Even though you are not familiar with this phenomenon, you may observe turbulence in daily life. It is hard to define clearly what turbulence is, however,we are going to describe the outline of this phenomenon to give you the general idea. 2) What are the benefits of turbulent control? In this section, we are going to explain briefly what 'turbulent flow control' means and what we can do by using such control technologies. The final goal of this project is turbulent control including the following topics: drag reduction control of mixing acceleration weather control (on a large scale) etc. The study topics can be classified into the following sub-themes: Sub-theme 1: Active Control of Turbulent Flow The objectives of this study are to investigate turbulence and to control turbulence according to conditions. We are studying the following two methods now: (1) To use micro-machine technology. (2) To add surfactants into fluid to change its physical properties. We are going to give you brief explanation of control theories, actuators for flow field control, sensors for monitoring flow field condition, and numerical simulation. Active control of turbulence by using micromachine Control theory Actuators Sensors Numerical simulation Active control of turbulence by physical property control (to change physical properties by adding surfactants) Control theory Actuators Sensors Numerical Simulation Sub-theme 2: Turbulent Combustion Control The main objective of this study is turbulent combustion control, which means to control turbulent flame as well as to control a turbulent fluid flow. We make use of combustion phenomena on various occasions; engines used for thermal power plants, automobiles, airplanes and vessels, garbage incineration plants, water heaters for home use, cooking stoves. It is well known that combustion causes greenhouse gas (such as CO2) emission, or nitrogen oxide emissions that contribute to air pollution. Indeed it is said that human civilization started when men began to use fire, but combustion has negative influence on our residential environment. Because of its low environmental impact, lean premixed combustion technology has been getting a lot of attention recently. The lean premixed combustion technology, however, is still under development and does not have a wide range of application due to its instability. Thus we aim to establish 'more stable' combustion technology with 'much less environmental impact' and to control turbulent combustion field. In this section, we are going to explain the following topics: complexity of turbulent combustion, lean premixed combustion technology, and destabilization factor for lean premixed combustion. Furthermore, we are going to give a brief description of sensors for turbulent combustion fields and numerical simulation, which are important tools of this study. Variation of turbulent combustion, lean premixed combustion Instability analysis of lean premixed combustion�inoise, oscillation, blowoff, backfire�j Sensor for combustion measurement Numerical simulation