shpslogo.jpg (6992 bytes)

FAQ - Contact Us - Tell A Friend - Free-Ed.Net Home   Bookmark and Share

 

2.23. IGNITERS

Gas turbine igniters come in many sizes and shapes depending upon the duty they will be subjected to. The electrodes of the plugs used with high-energy ignition systems must be able to accommodate a current of much higher energy than the electrodes of conventional spark plugs are capable of handling. Although the high-energy current causes more rapid igniter-electrode erosion than that encountered in reciprocating-engine spark plugs, this is not a major disadvantage, because of the relatively short time that the ignition system is in operation. Most igniter plugs used in turbine engines are of the annular-gap type, shown in figure 2.16.

Simplex Fuel Nozzle
Figure 2.16. Annular Gap Igniter Plug.

The annular-gap igniter plug protrudes slightly into the combustion chamber liner to provide an effective spark. Another type of igniter is the constrained-gap plug which does not closely follow the face of the plug; instead it tends to jump in an arc which carries it beyond the face of the chamber liner. Because the constrained-gap plug does not have to protrude into the liner, the electrode operates at a cooler temperature than that of the annular-gap plug.

 

 

David L. Heiserman, Editor

Copyright   SweetHaven Publishing Services
All Rights Reserved

Revised: June 06, 2015