# US 4,397,613 A · Compression wave machine

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- Number: US 4,397,613 A
- Document ID: US4397613A
- Status: Granted
- Kind: A
- Application number: 06/232,622
- Filed: 1981-02-09
- Granted: 1983-08-09
- Earliest claimed: 1980-03-17
- Assignees: BBC Brown, Boveri & Company, Limited
- Inventors: Jakob J. Keller
- Web page: https://patentgrep.com/patent/US4397613A

## CPC

- F04F 13/00: Pressure exchangers
- F04F: PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED {(evacuating by sorption F04B)}; SIPHONS {(conveying materials in bulk by flows of gas, liquid of foam B65G53/00)}

## Abstract

In order to reduce the intermixing of air and exhaust gases in the cells of gas dynamic compression wave machines caused by the formation of shear layer vortices, the geometry of the leading side of the high pressure inlet orifice facing the bucket wheel has a curved convex or convex-polygonal configuration. Also, the ends of cell walls at the gas inlet ends thereof can be of a profiled configuration to further improve the gas flow conditions in the cells.

## Claims

### Claim 1

In a gas dynamic compression wave machine of the type comprising a bucket wheel rotating centrally between lateral housing parts on air and gas sides of the wheel, each housing part including inlet and outlet orifices, wherein a high pressure gas inlet orifice has a profiled configuration at its opening toward the bucket wheel, the improvement wherein the profile is on a leading edge of said orifice and is of convex shape to prevent shear layer vortexes.

### Claim 2 (depends on 1)

Apparatus according to claim 1, wherein said profile is of curved convex shape, and has a radius of curvature equal to approximately one-half the distance between the cell walls.

### Claim 3 (depends on 1)

Apparatus according to claim 1, wherein said profile is of convex-polygonal shape and is formed by two wall parts defining an angle of approximately 160.degree. therebetween, each of said wall parts forming the same angle with a horizontal plane.

### Claim 4 (depends on 3)

Apparatus according to claim 3, wherein one of said wall parts is inclined toward the bucket wheel in a direction counter to wheel rotation, with the width of said one wall part comprising approximately 75% of the distance between the cell walls.

### Claim 5 (depends on 1)

Apparatus according to claim 1, wherein the ends of cell walls adjacent the inlet side of the wheel have profiled configurations.