Optimization of the Spatial and Temporal Fuel Distribution for Stable Combustion in Lean Premixed Combustors

Speaker(s): 
Date: 
November 30, 2000 - 12:00pm
Location: 
Bldg. 90

The limited success that has been achieved to date in suppressing unstable combustion in lean premixed combustors has been based on the use one of three approaches: a pilot flame, active combustion control using either primary or secondary fuel flow modulation, or modification of the fuel time lag. What these approaches have in common is that they all involve changing the spatial and/or temporal fuel distribution in a manner, which suppresses a given instability. In this presentation, results are presented from an experimental study of the effect of the spatial and temporal fuel distribution on unstable combustion in a laboratory scale lean premixed combustor. Such information is essential for the development of strategies for defining the optimum spatial and temporal fuel distribution for suppressing a given instability, where in general the notion of optimum must include maximizing noise suppression while minimizing the NOx penalty, which may result from any deviation from perfectly premixed conditions. The experiments were conducted in a unique combustor facility, which provides the capability to extensively vary the spatial and temporal fuel distribution. The combustor inlet fuel distribution was characterized using planar laser induced fluorescence while the time and location where the fuel actually burns was determined using chemiluminescence imaging. In addition the instabilities were characterized in detail, using high frequency response pressure transducers, infrared absorption equivalence ratio measurements and phase-synchronized chemiluminescence imaging. The results of these measurements reveal the mechanism by which a given fuel distribution suppresses a given instability and in turn provides the insights and understanding which is necessary for the development of a methodology for making an a priori determination of the optimum fuel distribution for a given instability.

Add event to Google Calendar

Announcement List

To be added to our seminar annoucement list please, email ETA Seminars. Seminars may change without notice, stay informed by joining our seminar email list. 

Site Access

For site access please email your request to ETA Seminars. To arrive at Building 90 via the LBNL shuttle, take "Blue Uphill". Click here for the shuttle schedule. To ensure your site access is set-up send your request 36 hours in advance of the seminar.

Remote Access

Not able to attend in person? Remote participants can use ReadyTalk Audio & Net conference to phone in to listen, while viewing the presentation via the ReadyTalk site.

Web Access Code: 4864835

USA & Canada call-in number:
1 (866) 740-1260
Access Code: 4864835#

International callers:
Please visit this website to see if a toll-free call-in number is available for your international location.

If not, you will need to pay for the call yourself and use this phone number:

(303) 248-0285.