Final answer:
Detonation in an aircraft reciprocating engine is the spontaneous combustion of the air-fuel mixture, causing a rapid increase in pressure and temperature. It can occur due to various factors and can lead to engine damage and reduced performance.
Step-by-step explanation:
Detonation in an aircraft reciprocating engine refers to the spontaneous combustion of the air-fuel mixture in the combustion chamber. It occurs when the fuel-air mixture ignites at multiple points simultaneously, resulting in an uncontrolled and rapid increase in pressure and temperature. This can lead to engine damage and reduced performance.
Detonation can be caused by factors such as high compression ratios, high cylinder temperatures, low-quality fuel, or improper engine timing. It is important to prevent detonation in aircraft engines through careful design, monitoring, and maintenance.