knock rating

[′näk‚au̇t ‚rād·iŋ] (engineering) Rating of gasolines according to knocking tendency.

knock rating

The standard scale of resistance to knock (the ability of fuel to remain at high temperatures and pressures without causing detonation) of reciprocating engine fuels, measured relative to isooctane. It is expressed as a percentage by volume of iso-octane in a mixture with normal heptane that has the same knocking characteristics as the fuel under question. Fuel with an 87 knock rating is a mixture of 87% iso-octane and 13% heptane. It was previously called octane rating.

单词	knock rating
释义	knock rating knock rating [′näk‚au̇t ‚rād·iŋ] (engineering) Rating of gasolines according to knocking tendency. knock rating The standard scale of resistance to knock (the ability of fuel to remain at high temperatures and pressures without causing detonation) of reciprocating engine fuels, measured relative to isooctane. It is expressed as a percentage by volume of iso-octane in a mixture with normal heptane that has the same knocking characteristics as the fuel under question. Fuel with an 87 knock rating is a mixture of 87% iso-octane and 13% heptane. It was previously called octane rating.
随便看	spacewalks spacewar spaceward spacewards space warfare space warning squadron space & warning systems center space wave space wave field space-wave leaky mode space weapon space weapons space weather space weather analysis and forecast system space weather euro news space weather modeling framework space weather squadron spaceweek international association space & weight space wing space wire test set spacewoman spacewomen space writer spacey