GB2207257A

GB2207257A - Fluidic devices

Info

Publication number: GB2207257A
Application number: GB08716670A
Authority: GB
Inventors: John Russell Tippetts
Original assignee: UK Atomic Energy Authority
Current assignee: UK Atomic Energy Authority
Priority date: 1987-07-15
Filing date: 1987-07-15
Publication date: 1989-01-25
Also published as: GB8716670D0

Abstract

A fluidic device, in particular a turn-up vortex amplfier, has two tangential flow passages 11, 12 leading to a vortex chamber 10, at least one of the passages having a cross-sectional area which increases as it extends away from the chamber. <IMAGE>

Description

Fluidic Devices This invention relates to fluidic devices.

According to this invention a turn-up vortex amplifier has a vortex chamber and two tangential flow passages leading to the chamber, one of said passages having a cross-sectional area which increases as it extends away from the chamber.

Both said passages may have cross-sectional areas which increase as they extend away from the chamber.

From another aspect a turn-up vortex amplifier has one of its tangential flow passages in the form of a diffuser for outflow.

Both passages may be in the form of a diffuser for outflow.

The invention may be performed in various ways and one specific embodiment with possible modifications will now be described by way of example with reference to the accompanying drawing of a turn-up vortex amplifier.

One form of vortex amplifier is described in the British patent specification 1339642.

In the present case a vortex chamber 10 has two tangential input passages 11, 12 having generally parallel axes and both on the same side of the chamber with respect to axial outlet passage 13. There may be two opposed axial outlet passages 13 which may be diffusers.

Ip the present case the passages 11, 12 are of diffusing cross-section. Thus, for example, in the case where the respective inlet ports gila, 12a in the wall 14 of the chamber 10 are circular, the passages may be conical of circular cross-section.

In the case where the inlet ports gila, 12a are of rectangular shape, the passages 11, 12 will be of rectangular cross-section.

Thus flow 15 can leave the device with minimum or reduced pressure loss. Normally there would be inflow 16 at one port (which could be either port) and outflow 15 at the other port. A large proportion of the inflow may form outflow 15.

One end of the passages 11, 12 may be in the form of a diffuser, the other having a uniform cross-section.

One suitable angle of divergence is 7 .

The junctions between wall 14 and passages 11, 12 are preferably in the form of rounded corners 20; the radius of these corners is proportional to the minimum diameter d of the passage 11 or 12 (ie. at its junction with chamber 10). The radius of the corner may be between o and d.

Claims

1. A fluidic device comprising a vortex chamber and two tangential flow passages leading to the chamber, one of the passages having a cross-sectional area which increases as it extends away from the chamber.

2. A fluidic device as claimed in claim 1 in which both flow passages have cross-sectional areas which increase as they extend away from the chamber.

3. A fluidic device as claimed in claim 1 or 2 in which one or both of the tangential flow passages is or are in the form of a diffuser for outflow.

4. A fluidic device, in particular a turn-up vortex amplifier, substantially as herein described with reference to and as illustrated in the accompanying drawing.