secondary air

secondary air

[′sek·ən‚der·ē ′er]
(mechanical engineering)
Combustion air introduced over the burner flame to enhance completeness of combustion.

secondary air

1. 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.
References in periodicals archive ?
Tenders are invited for Regular maintenance works of boilers ,mills,air pre heaters,id fans,fd fans,pa fans,seal air fans,scanner air fans,esp s,flue gas ducts,primary and secondary air ducts,feeders and feeder floor etc of unit-1 and 2 boilers and their auxiliaries during the year 2018-19 from 01-04-2018 to 31-03-2019.
For this reason, this research seeks to find out how the combustion quality is influenced by the structural elements of the combustion chamber, such as the thermal insulation layer of the combustion chamber and the position of secondary air intake.
The results were compiled on the basis of temperature at the wall of combustion chamber, temperature at the exhaust, pressure loss during combustion, recirculation of primary air and the cooling effect created by the secondary air to minimize temperature at the walls of combustion chamber.
The automaker is recalling the vehicles because a relay that controls the secondary air injection pump is prone to failure, causing the pump to run continuously.
The thrust of turbofan engine is 80% realizated by the fan that divides the engine airflow into the primary air flow and secondary air flow defined by the bypass ratio.
REPLACE THE PRIMARY AND SECONDARY AIR FILTER ELEMENTS WHEN THEY'RE DAMAGED OR TORN, OR IF THE AIR CLEANER INDICATOR STAYS & IN THE RED AFTER A CLEANING.
The Harper Bridge Sleeve Flow-Thru feature allows secondary air to permeate the system to make it easy to mount plate sleeves or ITR plates.
To carry out flow analysis of a gas turbine burning combustion chamber[2] and to propose the best possible design of primary and secondary holes, to achieve optimal primary to secondary air flow ratio at cold flow conditions.
LDevi et al [14] reported that secondary air injection to the gasifier results in a significant tar reduction and also a higher temperature could be attained due to secondary air injection in the gasifier.
The primary air is introduced from the distributor and the secondary air injected into the furnace from the side walls at three different heights.
r] requires some assumptions to be drawn about the exact meaning of the qualitative definition given in the standard, as well as knowledge about the mixing and airflows in the region that the secondary air is drawn from.
Topics include transient engine startup and shutdown, mixture formation, cold-start hydrocarbon emissions mechanisms, characterization of cold engine processes, spark retardation and secondary air injection for improving catalyst light-off performance, the effects of fuel properties and fuel reforming on cold-start hydrocarbon emissions and catalyst light-off, advanced catalyst design, the hydrocarbon trap, three-way catalytic converter system monitoring, evaporative emissions reduction, onboard diagnostics, emissions measurements and near-zero emission gasoline powered vehicle systems from BMW, Ford, Honda, Nissan, and Toyota.