| 摘要 |
A heat exchanger 40 for a gas turbine engine 10 comprises first 46 and second 48 sides enclosing a cavity 58. A first set of fins 66 is supported on the first side and arranged outside the cavity. The fins have a leading edge 74 of a first height (70, fig 4) and a trailing edge 76 of a second height (72), wherein the first height is less than the second height. A linear outer edge 78 adjoins the leading and trailing edge. The leading and trailing edge taper toward one another and the leading edge is shorter than the length of the trailing edge. The first and second heights may be different to the first and second lengths. The fins are trapezoidal in shape whereby their tapered design reduces air side pressure loss and improve airflow through the fins and reduce fuel consumption. The leading and trailing edge may taper in cross-section and include tapered unparallel flat surfaces (80, figs 5 & 6) or may include rounded lateral surfaces (180, fig 7). A second set of fins 68 may be provided on the second side. The cavity may communicate oil from an oil bearing compartment to be cooled. |
