COMBUSTOR AND GAS TURBINE HAVING THE SAME

摘要

A combustor is equipped with a burner case, and a base plate spreading from a downstream end of the burner case in a radial direction. The base plate defines a purging air space at an upstream side of the base plate. The combustor is formed with a purging air flow passage that injects purging air in the purging air space to a downstream side relative to the base plate. An outflow opening of the purging air flow passage is formed within an opening formation range. The opening formation range is made up of a range from the downstream end of the burner case to a plate thickness dimension of the base plate toward the upstream side, and a range from an inner circumferential surface of the burner case to the plate thickness dimension of the base plate in the radial direction.

主权项

1. A combustor comprising:
a nozzle having a rod-like portion centered on a burner axis and configured to inject fuel; a burner case configured to form a tubular shape, to surround an outer circumference of the nozzle, and to inject air and the fuel from the nozzle from an upstream side that is one side in an axial direction in which the burner axis extends to a downstream side that is the other side; and a base plate spreading from a downstream end of the burner case in a direction having a component of a radial direction based on the burner axis and configured to define a purging air space, into which the purging air flows, at an outer circumferential side of the burner case which is an upstream side of the base plate wherein a purging air flow passage injecting the purging air in the purging air space into the burner case or to a downstream side relative to the base plate is formed in at least one of the base plate and the burner case, an outflow opening of the purging air flow passage which injects the purging air is formed within an opening formation range, and the opening formation range is made up of a range from the downstream end of the burner case to an opening formation range dimension, which is one of a plate thickness dimension of a case forming plate forming the burner case and a plate thickness dimension of the base plate, toward an upstream side, and a range from an inner circumferential surface of the burner case to the opening formation range dimension in the radial direction.