And manufacturing process for directed impingement punched plates

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

• a heat shield panel having a first surface and a second surface opposite the first surface;
• and
• a combustion liner having an inner surface, an outer surface opposite the inner surface of the combustion liner, and an impingement slot extending from the outer surface of the combustion liner to the inner surface of the combustion liner, the second surface of the heat shield panel and the inner surface of the combustion liner defining an impingement cavity therebetween in fluid communication with the impingement slot for cooling the second surface of the heat shield panel,
• wherein the impingement slot includes an inlet and a slot tab configured to direct airflow into the impingement cavity at least partially in a lateral direction parallel to the second surface of the heat shield panel such that a cross flow is generated in the impingement cavity,
• wherein the impingement slot and the slot tab are triangular in shape,
• wherein the slot tab is a portion of the combustion liner that has been punched out of the combustion liner and bent away from the combustion liner into the impingement cavity to a non-perpendicular angle between the inner surface of the combustion liner and an inner surface of the slot tab by a punch manufacturing process, a size of the inlet being dependent upon a shape of the slot tab and a length of the slot tab, the slot tab being bent away from the combustion liner at a fold line, and
• wherein the slot tab is curved around a longitudinal axis of the slot tab, the longitudinal axis extending perpendicularly from the fold line to a corner of the slot tab.