Abstract: An improved heat transfer assembly includes a textured impingement surface and means for impinging cooling air directly upon the textured surface. A component includes a surface textured to increase convective heat transfer with minimal increase in resistance to conductive heat transfer through the component. The textured surface can comprise an array of closely spaced hemispherically shaped protuberances. A method is disclosed for texturing a surface with discrete laser welds.

Abstract: A fuel nozzle having increased thermal resistance which eliminates or minimizes vaporization of fuel passing through the fuel nozzle. The fuel nozzle has a tubular heat shield which surrounds a nozzle stem to form an air gap between the nozzle stem and the heat shield. A radiation layer is located on an inner wall of the heat shield and an outer wall of the nozzle stem. The radiation layer is a layer or plating using a metal having a low emissivity, such as gold (Au).

Abstract: The heat transfer coefficient distribution on the surface of a component is measured by removing a predetermined amount of material from the surface of the component and replacing it with an insert comprising a layer of low thermal conductivity material, an array of temperature sensors, and a heater. The heat transfer coefficient is determined by applying a known amount of heat flux to the component by way of the heater and sensing the outputs of the temperature sensors. This procedure is carried out on actual hardware rather than on simplistic scale models of hardware.

Abstract: Heat flux distribution and heat transfer coefficient distribution over a surface of a component used in a high temperature environment are determined by supplying coolant of predetermined characteristics to the component and measuring a temperature distribution over a predetermined surface. The heat flux at each temperature measurement point on the surface of the component is determined from heat flux calibration data obtained before the component is placed in service and while it is being operated at in-service cooling conditions. The heat transfer coefficient at various locations on the surface of the component is determined from the heat flux indicated by the heat flux calibration data, the temperature of the surface, and the temperature of the environment in which the component is situated.

Abstract: The thermal performance of cooling circuits for cooled components, such as turbine blades used in gas turbine engines, may be determined by applying a known amount of heat flux to a predetermined surface of the component, directing a cooling fluid flow having predetermined characteristics through the cooling circuit of the component, and measuring a temperature distribution on a preselected surface of the component.The thermal performance of heating circuits for heated components, such as those involved in clearance control in a gas turbine engine, or other components in which a controlled thermal contraction or expansion is desired, may be determined by applying a known amount of heat flux to a predetermined surface of the component, applying a cooling fluid flow having predetermined characteristics to the heating circuits, and measuring a temperature distribution on a preselected surface of the component.