{
  "$type": "site.standard.document",
  "description": "A turbofan gas turbine engine comprises, in axial flow sequence, a heat exchanger module, a fan assembly, a compressor module, and a turbine module. The fan assembly comprises a plurality of fan blades defining a corresponding fan area (A). The heat exchanger module is in fluid communication with…",
  "path": "/patents/1411300",
  "publishedAt": "2025-11-19T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01D25/12",
    "ROLLS ROYCE PLC [GB]"
  ],
  "textContent": "A turbofan gas turbine engine comprises, in axial flow sequence, a heat exchanger module, a fan assembly, a compressor module, and a turbine module. The fan assembly comprises a plurality of fan blades defining a corresponding fan area (A). The heat exchanger module is in fluid communication with the fan assembly by an inlet duct. The heat exchanger module comprises a plurality of radially-extending vanes arranged in a circumferential array with at least one of the vanes comprising at least one heat transfer element for the transfer of heat from a first fluid contained within the or each heat transfer element to an airflow passing over a surface of the or each heat transfer element prior to entry of the airflow into an inlet to the fan assembly. [0002] The or each heat transfer element extends axially along the corresponding vane, with a swept heat transfer element area (A) being the wetted surface area of the or all heat transfer elements in contact with the airflow. [0003] A Fan to Element Area parameter F is defined as: F EA = A HTE A FAN and the F parameter lies in the range of 47 to 132.",
  "title": "TURBOFAN WITH AIR-COOLED HEAT EXCHANGER IN THE INLET FLOW UPSTREAM OF THE FAN"
}