What is the function of the diffuser section in a jet engine?

The diffuser section in a jet engine plays a crucial role in managing airflow. Its primary function is to slow down and stabilize the incoming air before it enters the combustion chamber or the next stage of the engine. By increasing the air pressure and reducing its velocity, the diffuser ensures that the flow is more uniform, which is essential for efficient combustion. This stable airflow minimizes turbulence, reduces the likelihood of airflow separation, and maximizes the efficiency of the combustion process.

In contrast, the other options describe functions that are more associated with other components of the engine. While some components, like the compressor, are specifically designed to accelerate air, the diffuser's purpose is quite the opposite. Similarly, combustion occurs in the combustor section, not the diffuser. Lastly, energy extraction happens in the turbine stage of the engine. Each section of the jet engine has a distinct role, and the diffuser's stability-enhancing function is vital for overall engine performance.