What is a common operational characteristic of gas turbines with respect to starting?

Gas turbines are designed to operate efficiently and reliably, but they have specific starting requirements. One critical characteristic is the necessity for initial rotation before the fuel is engaged. This rotation serves two primary purposes: it allows the turbine's compressor to begin drawing in air to create the necessary conditions for combustion and helps achieve the required speed for ignition.

When the turbine is initially spun, it creates sufficient airflow through the combustion chamber, enabling fuel to be injected and ignited without the risk of combustion issues or damage to the engine. This prerequisite for rotation distinguishes gas turbines from some other engine types, where fuel can be introduced without prior movement. The turbine must reach a minimum rotational speed to ensure that the combustion process is stable and efficient.

Starting a gas turbine without prior rotation would compromise its ability to generate the required pressure and airflow, leading to potential operational failures. This characteristic is essential in ensuring the turbine operates safely and effectively from the moment fuel is introduced.