Nozzle bolting arrangement for a turbine

A radial flow turbine comprising:

• a rotor including a plurality of vanes defining an inlet, an outlet, and a flow path therebetween;
• a shroud positioned to cover at least a portion of the flow path;
• a housing positioned to at least partially support the rotor for rotation about a rotational axis, the housing at least partially defining a chamber for the receipt of a flow of products of combustion;
• and
• a plurality of nozzle guide vane assemblies positioned to provide fluid communication between the chamber and the inlet, each of the plurality of nozzle guide vane assemblies positioned adjacent another nozzle guide vane assembly to at least partially define one of a plurality of converging flow paths, each nozzle guide vane assembly including:
• a guide vane positioned between the shroud and the housing and including an aperture therethrough;
• a bolt engaged with the shroud and extending through the aperture to sandwich the guide vane between the shroud and the housing, wherein the bolt includes a first dowel portion and a second dowel portion and wherein the first dowel portion is sized to engage the guide vane and the housing and the second dowel is sized to engage the guide vane and the shroud to position the guide vane;
• and
• a resilient member having a stiffness less than the bolt and cooperating with the bolt to apply a compressive force to the guide vane.

A method of assembling a radial flow turbine to accommodating differential thermal growth of a nozzle guide vane of the radial flow turbine, the method comprising:

• supporting a turbine rotor in a turbine housing for rotation about a rotational axis, the turbine rotor defining an inlet, an outlet, and a flow path therebetween;
• positioning a shroud adjacent the flow path, the shroud cooperating with the housing to at least partially define a chamber for the receipt of a flow of products of combustion;
• arranging a plurality of nozzle guide vanes to define a plurality of converging flow paths to provide fluid communication between the chamber and the inlet;
• tensioning a plurality of bolts, each bolt corresponding with one of the nozzle guide vanes to sandwich each of the plurality of nozzle guide vanes between the shroud and the housing, each of said bolts engaging said one of said nozzle guide vanes and said housing with a first dowel portion, and said one of said nozzle guide vanes and said shroud with second dowel portion respectively;
• and
• positioning a plurality of resilient members, each resilient member corresponding with one of the bolts such that each of the plurality of bolts compresses the corresponding resilient member and the resilient member applies a compressive force to the corresponding nozzle guide vane.