F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
123/54
F02M 19/10 (2006.01) F02M 9/10 (2006.01) F02M 19/08 (2006.01)
Patent
CA 1129280
FLOW DEVICE AND METHOD Abstract of the Disclosure A flow device and method delivers a gaseous medium to utilization equipment having variable pressure condi- tions at its intake. A gaseous medium intake zone con- nects with structure defining a variable area throat zone for constricting the flow of the gaseous medium to increase its velocity to sonic. The throat zone is adjustably varied in correlation with operating demands imposed upon the utilization equipment. Wall structure downstream from the throat zone provides a gradually diverging zone for efficiently recovering the kinetic energy of the high velocity gaseous medium as static pressure. Through such efficient recovery the velocity of gaseous medium through the throat zone is sonic over a wide range of pressure conditions at the intake of the utilization equipment. Perforations are provided in the wall structure downstream and spaced from the throat zone, and these perforations connect on the back side of the wall structure with the intake of the utilization equipment. When supersonic flow occurs the high velocity mass moving past the perforations pulls a small portion of the gaseous medium already delivered to the intake of the utilization equipment into the gradually diverging zone. Such recirculated medium functions to disturb the supersonic flow and thereby shift the location of shock upstream from where it would other- wise occur to the location of the perforations. While shock causes the flow to separate from the wall structure, upstream shifting of the shock leaves sufficient wall structure downstream to allow the flow to reattach before delivery to the intake of the utilization equipment. Such reattachment eliminates flow jetting.
347171
Dresser Industries Inc.
Macrae & Co.
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