Gas turbine engine component

摘要

An internally cooled gas turbine engine component has a line of cooling air discharge holes, an internal cooling channel, an internal feed cavity for feeding cooling air from the channel to the discharge holes, and flow disrupting pedestals arranged in rows. A method of configuring the component includes:
determining angles α and β of the directions of cooling air flow into the first and Nth rows, respectively;defining a change in angle φ of the direction of cooling air flow between rows as φ=(β−α)/N; andpositioning the pedestals such that a line extending forward from the center of each pedestal in the ith row at an angle {α+φ(i−1)} intersects the (i−1)th row at a location which is midway between two neighboring pedestals of the (i−1)th row, i being an integer from 2 to N.

主权项

1. A method of configuring an internally cooled gas turbine engine component,
the component including:
a line of cooling air discharge holes,an internal cooling channel disposed forward of and extending substantially parallel to the line of discharge holes,an internal feed cavity disposed between the channel and the line of discharge holes for feeding cooling air from the channel to the discharge holes, anda plurality of flow disrupting pedestals extending between opposing sides of the feed cavity,
the pedestals being arranged in a number N of rows, which extend substantially parallel to the line of discharge holes, each row of the number N of rows forming flow inlet angles that vary along the length of the rows,a first row of the number N of rows being located closer to an entrance of the feed cavity than an Nth row of the number N of rows, andremaining rows of the number N of rows being spaced between the first row and the Nth row, and the pedestals being spaced apart from each other within each row, the method including:
determining the flow inlet angle α of a direction of cooling air flow into the first row at one or more radial positions;determining a flow outlet angle β of the direction of cooling air flow from the Nth row;defining a change in angle φ of the direction of cooling air flow between the rows as φ=(β−α)/N for the one or more radial positions; andstarting from row N, positioning the pedestals such that a line extending forward from the centre of each pedestal in the ith row at an angle {α+φ(i−1)} intersects the (i−1)th row at a location which is midway between two neighbouring pedestals of the (i−1)th row, i being an integer from 2 to N.