US 3578009 A
Description (OCR text may contain errors)
United States Patent  Inventor Chris E. Spyropoulos Washington, D.C.  Appl. No. 770,184  Filed Oct. 24, 1968  Patented May 11. 1971 Assignee The United States of America as represented by the Secretary of the Army  DISTRIBUTED CONTROL FLUERIC AMPLIFIER 4 Claims, 1 Drawing Fig.
 US. Cl l37/81.5  Int. Cl FlSc 1/08,
F15c 1/14  Field of Search 137/815  References Cited UNITED STATES PATENTS 3,124,160 3/1964 Zilberfarb l37/8l.5 3,186,422 6/1965 Boothe..... 137/81.5 3,272,214 9/1966 Warren 137/815 3,405,725 10/1968 Fox 137/815 LEFT OUTPUT CONTROL Primary ExaminerSamuel Scott Att0rneysI-Iarry M. Saragovitz, Edward .1. Kelly, Herbert Berl and John D. Edgerton ABSTRACT: A flueric amplifier with two control ports for each control channel. Each control channel is split'to operate both ports. The control flow is split and applied to the power jet through the two separate control ports. This separate application is called distributed control and results in greater flow recovery and pressure recovery as well as improved switching time. One of the control ports comprises an entrainment control port for introducing positive pressure control fluid to the attachment bubble existing along the attachment wall, and the other one of the control ports constitutes a momentum exchange control port for creating a momentum impact force on the power stream.
RIGHT OUTPUT 90 RIGHT CONTROL PATENTEU m1 1 12m LEFT OUTPUT RIGHT OUTPUT 7 WRIGHT CONTROL INVENTOR cums E. SP Y ROPOULOS DISTRIBUTED CONTROL FLUERIC AMPLIFIER BACKGROUND OF THE INVENTION SUMMARY OF THE INVENTION This invention is a flueric amplifier in which each control flow is split and applied to the power jet through at least two separate control ports. This separate application is called distributed control and results in greater flow recovery and pressure recovery and improved switching time.
BRIEF DESCRIPTION OF THE DRAWING The sole FIGURE is a top view of a flueric amplifier according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT The FIGURE represents a flueric amplifier, especially a bistable amplifier. The power jet flow is applied through a DESCRIPTION OF THE PREFERRED EMBODIMENT and enters an interaction chamber 2 through ajet nozzle area 3.
After deflection, accomplished in a manner described below, the fluid from the power jet leaves the chamber through either a left output channel 4 or a right output channel 5, which are separated by a splitter 6.
As illustrated, a control stream is being applied to the chamber from a left primary control channel 7. Channel 7 is split into secondary channels 8 and 9 by a splitter 10.
Valves 11 and 12, which may be variable, are located respectively in channels 8 and 9 to control the flueric impedance of the channels 8 and 9 for proper proportioning of flow between the two channels.
The control flows from channels 8 and 9 enter the interaction chamber through control ports 13 and 14 respectively.
Elements 7a through 14a from the right side of the amplifier respectively correspond in description and function to elements 7 through 14 from the left side of the amplifier.
The distance from jet nozzle 3 to power jet splitter 6 is preferably kept to a minimum for optimum pressure and flow recovery.
In the operation of the amplifier, assume that the power jet is locked onto the left wall of the interaction chamber. This configuration of the jet causes a low-pressure region, sometimes called an attachment bubble, to form along the left wall. The low-pressure region holds the jet to the wall by maintaining a pressure differential across the jet.
When'it is desired to move the jet away from the left wall, fluid must be introduced from the left control to build up pres sure in the bubble region, supply the entrainment needs of the jet on the bubble side, and thus destroy the bubble. In the place of the bubble is left a region of higher pressure which tends to deflect the jet to the right. The control fluid for this ports on each side of the interaction chamber. Three or more ports could be used. However, the preferred embodiment uses two ports for relative ease of construction.
Although the preferred use of the improved control is in a bistable amplifier, it would be obvious to use it in a proportional flueric amplifier.
Although the invention has been described in terms of an amplifier having left and right sides and two output channels, the invention would also be useful in a three-dimensional amplifier having more than two sides.
While the invention has been particularly shown and described with reference to a preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Iclaimi l. ln a flueric amplifier of the wall attachment type having tachment walls, the improvement comprising:
groups of longitudinally aligned control ports opening up into said chamber upstream of said attachment wall on opposite sides of the power stream with each output channel lying on diametrically opposite sides of the power stream from respective group of control ports effecting movement of said power stream into the same,
at least one upstream control port on each side of said chamber comprising an entrainment control port for introducing positive pressure control fluid to the attachment bubble existing along the attachment wall and at least one control port on the same side of said chamber and downstream of said entrainment control port constituting a momentum exchange control port for creating a momentum impact force on the same side of said power stream,
a common primary control channel for independently supplying control fluid and secondary control channels separately connecting the control ports for each group to its primary control channel to simultaneously supply control fluid to said chamber through said entrainment control port and said momentum exchange control .port.
2. An amplifier according to claim I wherein said groups of control ports number two and open up into said chamber on diametrically opposite sides thereof.
3. An amplifier according to claim I wherein each of the secondary control channels includes a variable flueric impedance for control of the amounts of fluid flow in each secondary channel.
4. An amplifier according to claim 3 wherein said groups of control ports are two in number and said groups of control ports and said output channels are diametrically opposite each other.