Combustion – Combustion bursts or flare-ups in pulses or serial pattern
Patent
1982-04-08
1984-03-27
Scott, Samuel
Combustion
Combustion bursts or flare-ups in pulses or serial pattern
431114, 431347, 431348, F23C 1104, F23D 1312
Patent
active
044391340
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a combustion chamber of the kind having axially aligned first and second chambers, a plurality of side chambers and a partition wall between the first and second chambers for guiding a stream of gases over the edges of the partition wall from the first chamber, through the side chambers and into the second chamber.
BACKGROUND AND SUMMARY OF THE INVENTION
In pulsating burners of the kind in question, there is a fuel nozzle at the inlet to direct the stream of fuel axially into the first chamber in a direction towards a central area of the pertinent partition wall in the combustion chamber. In the case where a liquid fuel such as oil is used, vaporization is already obtained in the inlet, but a portion of the fuel will impinge on the partition wall in the form of vapour or fuel drops. For all conditions, some cooling of the partition wall is obtained, and this cooling can be so heavy in some cases that the fuel carbonizes, to be deposited as soot, which results in operational disturbances, especially when starting.
The object of the invention is to avoid this problem, and this is achieved in accordance with the invention. The hot body in accordance with the invention spreads out the fuel while coming up to a temperature high enough to be substantially above the carbonization temperature of the fuel by a large margin. The desired intense heating of the hot body is done with the aid of the hot gases in the first chamber in the combustion chamber, and by heat transmission from the partition wall to the hot body via the foot of the latter.
The hot body in accordance with the invention spreads the fuel and screens off the central area of the partition wall, which thus cannot be struck by cooling fuel. The hot body simultaneously contributes, as is known in the art, to stabilizing the combustion in the combustion chamber.
To further increase heating of the hot body, its foot can to advantage be formed as a pillar extending through an opening in the partition wall to be situated in the hot gases in the outlet.
BRIEF DESCRIPTION OF THE DRAWINGS
Two suitable embodiments of the invention are shown as examples on the appended drawings.
FIG. 1 is a schematic section through a combustion chamber for pulsating combustion, the partition wall in the combustion chamber supporting a disc-shaped hot body in accordance with the invention,
FIG. 2 is a cross section along the line 2--2 in FIG. 1,
FIG. 3 is a cross section along the line 3--3 in FIG. 1,
FIG. 4 is a side view of the second embodiment, comprising a spherically shaped hot body with a pillar mounted in the opening in the partition wall according to FIG. 1,
FIG. 5 is a view seen from below of the hot body in FIG. 4,
FIG. 6 is a view from above,
FIG. 7 is a section along the line 7--7 in FIG. 4,
FIG. 8 is a section along the line 8--8 in FIG. 6, and
FIG. 9 shows the spherical hot body mounted in the combustion chamber.
DETAILED DESCRIPTION
The combustion chamber 10 in FIG. 1 is of known form and is divided by a partition wall 12 into a first chamber 14 and a second chamber 16, the latter merging into an outlet 18. Combustion air is inducted via an inlet 20, in which a nozzle 22 is arranged for spraying in fuel such as oil for admixture with the combustion air. It will be seen from FIG. 1 that the spread angle of the nozzle is comparatively small, resulting in that the fuel is directed in a relatively concentrated jet into the first chamber 14.
To avoid fuel particles impinging on the partition wall 12 in its central area, and thereby cooling this area to an undesirably low temperature which can cause the formation of soot, a flat-shaped hot body 24 is arranged at a predetermined height above the partition wall. In the example shown, the hot body 24 is substantially circular, to give a uniform spread to the fuel irrespective of the width of the fuel jet.
The body 24 is carried by a foot or a support 26 in the form of four radial flanges 25,28,30,32 arranged in a cross.
The foot 26 has an upper part situated above the wall 12, and
REFERENCES:
patent: 2402971 (1946-07-01), McCollum
patent: 2460086 (1949-01-01), Hess
patent: 2585221 (1952-02-01), Briskin
patent: 2671507 (1954-03-01), Morck, Jr.
patent: 3684424 (1972-08-01), Zink et al.
patent: 3853453 (1974-12-01), Olsson
patent: 4045160 (1977-08-01), Michels
patent: 4168950 (1979-09-01), Seemann et al.
Green Randall L.
Mareck B.V.
Scott Samuel
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