What type of ignition system is commonly used in gas turbines?

The type of ignition system commonly used in gas turbines is indeed a high intensity capacitor discharge ignition system. This system operates by storing electrical energy and then releasing it in a controlled manner to create a high-voltage spark. This spark provides a strong and consistent ignition source capable of starting the combustion process, especially in the high-speed and high-temperature environment characteristic of gas turbine engines.

This type of ignition system is particularly advantageous because it can effectively ignite the fuel-air mixture against the high back pressure and flow velocities present in gas turbines. The high intensity of the spark ensures that ignition occurs reliably, which is crucial for the operational safety and efficiency of the turbine.

Other types of ignition systems, such as centrifugal ignition, are typically used in different applications and do not provide the same reliability or efficiency in the demanding conditions of a gas turbine. Spark plug ignition systems are more commonly associated with piston engines rather than turbines, where the conditions require a more robust ignition system. Flame detection systems, while important for monitoring combustion and safety, are not ignition systems; rather, they are used to ensure that combustion is taking place and to detect any abnormal conditions during operation.