How many spark ignitors does the compressor rear stage have?

In gas turbine systems, particularly in the rear stage of the compressor, there are typically two spark ignitors. This design is critical for providing reliable ignition of the fuel-air mixture within the combustion chamber. Having two spark ignitors enhances the safety and reliability of the ignition process, as each ignitor serves as a backup for the other. If one ignitor fails, the second can still ensure that ignition occurs, preventing possible operational disruptions and enhancing the overall efficiency of the gas turbine system. This redundancy in design is essential for the operational integrity of gas turbines, especially in applications where uptime and reliability are paramount. Thus, the correct number of spark ignitors in the rear stage of the compressor is indeed two.