| 摘要 |
A gas turbine engine 10, in use, has an airflow though it to provide propulsion and power, a portion of which acts as an engine coolant, also to regulate combustor 20 temperature, and has guide vanes 30 cooled by a separate supply of steam, which may be supplied about vanes 30. The coolant air flow may be presented to combustor 20 at its intake and may also be received by vanes 30, the vane surfaces having apertures 30 for film cooling using the steam. The respective amounts of, and the ratio between, coolant airflow and steam received by the vanes, may be variable dependent upon combustion temperature. The combustion temperature is preferably regulated for relatively acceptable levels of carbon monoxide and oxides of nitrogen, and engine power and efficiency may be improved by the airflow's density, which is enhanced by the steam. This may also be a method of operating a gas turbine engine.
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