Improvements in Steam Turbine Blades.
Year: 1896

page_text: Date of Application, 24th Apr., 1896
Complete Specification Left, 23rd Dec., 1896-Accentel. 24th Apr.. 1397
PROVISIONAL SPECIFICATION.
Improvements in Steam Turbine Blades.
I, The Honorable CHARLES ALGERNON PARSONS, of Heaton Works,.
Newcastle-on-Tyne, in the County of Durham, Engineer, do hereby declare the
nature of this invention to be as follows:-
My invention relates to steam turbine blades and my object is to so shape the
blades as to produce the best or an improved form of passage between the blades
for the purpose of diminishing loss of energy by the forination of eddies. That
is, my object is to increase the power obtained from a given weight of steam.
My invention consists in forming the blades upon the back, that is on the convex
side as compared with the concave side-with a thickening or projection, the said
thickening or projection being nearer to the edge where the steam enters than
where it discharges. The projection tapers off to both edges more gradually to the
discharge edge than the admission edge.
By this modification in the shape of these curved blades I produce a passage
between the blades in which the minimum of loss of energy occurs, presumably by
the reduction of eddy resistance but possibly in other ways. In any case, whatever
be the correct explanation I find an improvement of about at least teu per cent. in
steam consumption by altering one of my steam turbines in this manner.
My invention may be applied to any of my well known steam turbines and also
to steam turbines of other constructions.
Dated this 24th day of Anil 1808
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.
Improvements in Steam Turbine Blades.
I, The Honourable CHARLES ALGERNON PARSONS, of Heaton Works,
Newcastle-on-Tyne, in the County of Northumberland, Engineer, do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
My invention relates to steam turbine blades and my object is to so shape the
blades as to produce the heat or an improved form of passage between the blades
for the purpose of diminishing loss of energy by the formation of eddies. That is,
my object is to increase the power obtained from a given weight of steam and at
the same time also to secure a blade of maximum strength and rigidity.
Referring to the accompanying sheet of drawings-
Figure 1 is a transverse section through a blade constructed in accordance with
my invention.

page_text: Figure 2 is a similar section through a blade in which my invention is' also
carried into effect.
Figure 3 is a view of the blades (Figure 1) seen ond on as arranged on a turbine
wheel.
My invention consists in forming the blades upon the back, that is on the convex
side as compared with the concave side, with a thickening or projection as a
(Figures 1 and 2) the said thickening or projection being nearer to the edge where
the steam enters than where it discharges. The projection a tapers off to both
edges but more gradually to the discharge edge than the admission edge. This is
olearly shown at Figure 3 where c are the admission edges and d the discharge
edges.
A is the turbine disc or wheel or cone in the periphery of which the blades are
.keyed.
By this modification in the shape of these curved blades I produce a passage
between the blades in which the minimum of loss of energy occurs presumably by
the reduction of eddy resistance but possibly in other ways. In any case, whatever
be the correct explanation I find an improvement of about at least ten per cent, in
steam consumption by altering one of my steam turbines in this manner.
1 find in one case for example that a moderate amount of thickening such as
shown in Figure 2 gives a gain of twelve per cent. and that a greater thickening
such as shown at Figure 1 gives a better result still.
My invention may be applied to any of my well known steam turbines and also
to steam turbines of other constructions.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is-
Thickening the convex sides of steam turbine blades as and for the purposes
herein before described and illustrated.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.