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Interference Effects Between Multiple Bluff Body Flameholders


Ames, Lionel Eugene (1956) Interference Effects Between Multiple Bluff Body Flameholders. Engineer's thesis, California Institute of Technology. doi:10.7907/JJVQ-3G91.


A general program was undertaken to determine the interference effects between multiple bluff body flameholders. The flameholders used for these experiments were 1/4 inch diameter water cooled cylinders tested in a 1 by 4 inch combustion chamber. Stability limits, flame geometry, and relative combustion efficiency were determined as functions of flameholder spacing and number. The results of the tests showed that the maximum blowoff velocity decreased as the number of flameholders increased. This reduction was primarily due to the increase in the blockage ratio. In addition, a reduction in maximum blowoff velocity occurred when the flameholders were moved from the symmetrical arrangement in the duct. A combustion instability characterized by a loud, high frequency noise occurred over well defined ranges of fuel air ratio, gas velocity, and flameholder spacing. The recirculation zone length and flame widths were primarily functions of blockage ratio, modified slightly by flameholder separation. No large scale interaction occurred between the wakes of adjacent flameholders. Combustion efficiency increased with the number of flameholders and was little affected by flameholder separation.

Item Type:Thesis (Engineer's thesis)
Subject Keywords:Aeronautical Engineering
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Zukoski, Edward E.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1956
Record Number:CaltechETD:etd-03182004-140703
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:991
Deposited By: Imported from ETD-db
Deposited On:18 Mar 2004
Last Modified:10 Jul 2023 22:24

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