How does an increased maximum compression ratio affect an aircraft engine?

An increased maximum compression ratio in an aircraft engine can lead to detonation, which is a rapid and uncontrolled combustion process that occurs when the air-fuel mixture ignites prematurely. Higher compression ratios can elevate the temperature and pressure of the air-fuel mixture beyond its limits, increasing the likelihood of this phenomenon. Detonation can cause severe damage to engine components, including pistons, spark plugs, and valves, affecting overall engine reliability and performance.

To elaborate further, using a higher compression ratio typically allows the engine to extract more energy from the fuel, leading to improved performance and efficiency under ideal conditions. However, if the fuel used does not have a sufficiently high octane rating to withstand the increased pressure and temperature without igniting prematurely, the risk of detonation rises significantly.

In summary, while a higher compression ratio generally offers benefits like enhanced power output and efficiency potential, without proper management and fuel selection, it poses the risk of detonation, which is critical to address in engine design and operation.