European Gas Turbines Limited

Nicholas J Kemsley

Peter W Hill

Brendan J Wilde

A brush seal is provided having the conventional 45.degree. bristle angle for part only of the seal length, the angle being varied through at least part of the remainder of the length, preferably finishing at 90.degree. at the ends of the seal. The seal may have the form of a semicircle with straight end-extensions, the bristle angle in the straight extensions being 90.degree.. Provision is also made to vary the length of the exposed part of the bristles so that, in areas where bristle density is high, the actual exposed length is reduced. In a method for manufacturing the seal, the bristle holder is made as a complete loop having two straight sections and two semicircular sections and the bristles are secured in the holder in accordance with the required variations in angle and exposed length such that two mirror-image seals exist on the two sides of a line joining the centerpoints of the straight sections, the holder then being divided into two along that line.

Brush seal and method for the manufacture of a brush seal

A transition duct arrangement for feeding combustion gases under pressure from a number (e.g. 4), of combustion chamber(s) arranged around the turbine into the annular passage containing the turbine blade structure. Each combustion chamber (5) has a transition duct section comprising a short length of the cylindrical combustion chamber walls (9 inner and 11 outer) developing into a section of annular duct (25 inner and 27 outer). The four transition duct sections make up a complete annulus but have to be clamped to the nozzle guide vane (85 FIG. 7 ) structure. The invention provides a means for combining the clamping and sealing of the transition sections efficiently and effectively.

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Loughborough, United Kingdom

Nicholas J Kemsley