FPTUs mix the primary air processed by central air-handling units with the secondary air
recirculated from conditioned spaces or the plenum and then deliver the mixture to the conditioned zones.
The first region of the control volume is the suction region in which the secondary air
or air to eject is suctioned toward the ejector's subsequent regions.
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
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 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  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.