Apparatus and method for mitigating particulate accumulation on a component of a gas turbine

A combustor for use in a gas turbine engine, the combustor enclosing a combustion chamber having a combustion area, wherein the combustor comprises:

• a combustion liner having an inner surface and an outer surface opposite the inner surface wherein the combustion liner includes a primary aperture extending from the outer surface to the inner surface through the combustion liner and a receiving aperture extending from the outer surface to the inner surface through the combustion liner;
• a heat shield panel interposed between the inner surface of the combustion liner and the combustion area, the heat shield panel having a first surface and a second surface opposite the first surface, wherein the second surface is oriented towards the inner surface, and wherein the heat shield panel is separated from the combustion liner by an impingement cavity;
• a passageway portion including a first end, a second end opposite the first end, and a radially outward surface extending from the second end to the first end, the passageway portion extending from the first surface of the heat shield panel through the impingement cavity and through the receiving aperture of the combustion liner, wherein the radially outward surface and the combustion liner define a gap therebetween, the gap fluidly connecting airflow in an airflow path proximate the outer surface of the combustion liner to the impingement cavity, wherein the gap is configured to direct the airflow along the radially outward surface and the radially outward surface defining a flat shaped to redirect the airflow in a lateral direction parallel to the second surface of the heat shield panel such that a lateral airflow is generated in the impingement cavity;
• an intermittent circumferential ring located in the impingement cavity and partially circumferentially surrounding the radially outward surface, wherein the intermittent circumferential ring defines a channel within the impingement cavity between the radially outward surface and the intermittent circumferential ring, wherein the intermittent circumferential ring includes cut-outs extending from a bottom of the channel to a top of the intermittent circumferential ring;
• and
• wherein the flat portion of the radially outward surface oriented parallel with the second surface of the second component, wherein the flat portion is located radially inward of the intermittent circumferential ring within the channel, wherein the flat portion is configured to redirect the airflow in the lateral direction parallel to the second surface and through the cut-outs into the impingement cavity radially outward of the intermittent circumferential ring to generate the lateral airflow in the impingement cavity.

A grommet of a combustor for use in a gas turbine engine, the grommet comprising:

• a passageway portion attached to an inner surface of a heat shield panel, the inner surface facing a combustion chamber, the passageway portion extending from the inner surface through a combustor liner opposite the heat shield panel and defining a passageway for introducing air to the combustor;
• a gap defined between a radially outward surface of the passageway portion and the combustor liner;
• a channel portion surrounding the passageway portion and adapted to receive an airflow from proximate an outer surface of the combustion liner through the gap,
• wherein the channel portion, defining a channel, has at least one cut-out to introduce a cross flow into an impingement cavity defined between the combustion liner and the heat shield panel,
• wherein the channel portion includes an intermittent circumferential ring located in the impingement cavity and partially circumferentially surrounding the radially outward surface, and
• wherein the intermittent circumferential ring defines the channel within the impingement cavity between the radially outward surface and the intermittent circumferential ring, wherein the intermittent circumferential ring includes the at least one cut-out extending from a bottom of the channel to a top of the intermittent circumferential ring;
• and
• a flat portion of the radially outward surface that is oriented parallel with the second surface of the second component, wherein the flat portion is located radially inward of the intermittent circumferential ring within the channel, wherein the flat portion is configured to redirect the airflow in a lateral direction parallel to the second surface and through the at least one cut-out into the impingement cavity radially outward of the intermittent circumferential ring to generate a lateral airflow in the impingement cavity.