Patent ID: 7197881

Claim:
A low loss flow limited passageway, comprising: a duct having an inner surface that defines a flow passageway, and including at least an inlet port in fluid communication with the flow passageway, the inlet port adapted to receive a flow of fluid from an inlet plenum and having at least a first cross sectional flow area, at least a portion of the flow passageway downstream of the inlet port having a second cross sectional flow area that is less than the first cross sectional flow area; and one or more flow limiting passages extending through the duct, the one or more flow limiting passages including an (i) inlet port in fluid communication with the inlet plenum and (ii) an outlet port in fluid communication with the duct flow passageway proximate the portion thereof having the second cross sectional flow area, and including a central axis that extends perpendicularly therefrom into the duct flow passageway, the central axis forming an injection angle with respect to the duct inner surface, wherein the injection angle is disposed such that the flow of fluid into and through the flow passageway is less than that of a duct that is configured substantially identical to the above-recited duct but does not include the above-recited one or more flow limiting passages.