| 释义 |
secondary air secondary air[′sek·ən‚der·ē ′er] (mechanical engineering) Combustion air introduced over the burner flame to enhance completeness of combustion. secondary air1. Air which is introduced into a furnace (in addition to the primary air which enters either as a mixture with fuel or as blast underneath a stoker) above or around the flames to promote combustion. 2. Air already in an air-conditioned space, in contrast to primary air which is introduced into the space. |