Assembly for directing combustion gas

An arrangement for delivering gases from a plurality of combustors of a can-annular gas turbine combustion engine to a first row of turbine blades, the arrangement comprising a gas path cylinder, a cone, and an integrated exit piece (IEP) for each combustor, wherein each IEP comprises a straight path portion for receiving a gas flow from a respective combustor via the cylinder and cone, and the IEP further includes a connection segment, wherein each IEP connects to an adjacent IEP at the connection segment of the adjacent IEP, and the connected IEPs define an annular chamber that extends circumferentially and is oriented concentric to a gas turbine engine longitudinal axis, for delivering the gas flow to the first row of blades;

• wherein gases flow from respective combustors, through respective straight path portions, and into the annular chamber;
• wherein each straight path portion comprises four side walls forming a closed polygonal cross section at an inlet end of the straight path portion, adjacent pairs of side walls being connected by radiused joints, defined by four radiused joints extending from an upstream location toward an exit end of the IEP, at least two of the joints having a constant radius from the upstream location to the exit end and at least one of the joints having a radius that is greater than the radii of the at least two joints;
• wherein the four side walls of the straight path portion are defined by a radially outer side wall opposite to a radially inner side wall, and the radially outer and inner side walls are coupled together with opposed forward and aft side walls, and the forward side wall defines a continuous side wall from an upstream end of the straight path portion to the exit end of the IEP;
• wherein the inner side wall is bounded by forward and aft longitudinal edges extending in the direction of a flow axis for the straight path portion, the connection segment includes a connection segment forward wall extending circumferentially from an upstream location to a downstream edge, and including a flared fillet, having longitudinal edges that diverge in a downstream flow direction, extending from the aft longitudinal edge of the inner side wall to the downstream edge of the connection segment forward wall.