学术报告

 

Flame and Wall Interactions & Flame and Acoustic Wave Interactions

 

Yang Zhang

Professor of Combustion of Energy,

Mechanical Engineering Department, University of Sheffield

 

*Flame and Wall Interactions: Flame modes, Wall materials, Fuel mixtures and

Thermal loading

 

Flame and wall interactions an important role in many combustion devices. In

some of the applications the heat transfer has to be as high as possible

while in some other cases the wall temperature should be kept as low as

possible. The investigation of flame of wall interactions is therefore of

great importance. In this study, impinging flames at different modes, fuel

mixture and thermal loading on different wall material has been studied. It

has been observed that the wall temperature is a strong function of both the

wall materials and fuel mixtures. The thermal loading can have very

different wall temperature patterns if the flame modes are different.

 

 

*Flame and Acoustic Wave Interactions: Acoustic streaming measurement and

Schlieren observation of flame dynamics

 

Flame and acoustic wave coupling can affect the combustion dynamics in a

significant way. For example, unwanted thermoacoustic instability could

interrupt the normal operation of power generation gas turbines causing

unwanted economic loss and inconvenience. In this study, flame and acoustic

wave interaction in an acoustically excited tube has been studied using PIV

and high speed schlieren visualization. The PIV measurements are

phase-locked with the acoustic excitation. Very interesting acoustic

streaming flow patterns caused by acoustic streaming have been observed. The

schlieren observation has shown the detail structure of the fuel and burnt

gas. The results provide insights into the complex interaction resultant

flame patterns.

 

时间： 2011年4月19日 （星期二）， 下午 2:00

地点：热能工程系动力机械与工程研究所  会议室