爆ばく燃ねん

noun

deflagration

Technical term in combustion science: rapid burning that propagates through a gas or across the surface of an explosive at subsonic speeds, driven by heat transfer.

• 爆ばく燃ねんは爆ばく轟ごうより穏おだやかな燃ねん焼しょう現げん象しょうである。

  Deflagration is a milder combustion phenomenon than detonation.

noun

knocking; engine knock

Automotive engineering term: abnormal combustion in a spark-ignition engine where the air-fuel mixture ignites spontaneously before the flame front arrives, causing a knocking sound.

• エンジンの爆ばく燃ねんを防ふせぐために高こうオクタン価かガソリンが使つかわれる。

  High-octane gasoline is used to prevent engine knocking.