| 摘要 |
A three stage lean burn combustion chamber (28) comprises a primary combustion zone (36), a secondary combustion zone (40) and a tertiary combustion zone (44). Each of the combustion zones (36,40,44) is supplied with premixed fuel and air by respective fuel and air mixing ducts (76,78,80,92). The secondary fuel and air mixing duct (80) has passages (80A) and apertures (90A) at its downstream end to supply air and fuel into the secondary combustion zone (40) at a first position in the at least one combustion zone (40) and the secondary fuel and air mixing duct (80) has passages (80B) and apertures (90B) at its downstream end to supply air and fuel into the secondary combustion zone (40) at a second position in the secondary combustion zone (40) downstream from the first position. This axial distribution of fuel in the combustion zone (40) reduces the generation of harmful vibrations in the combustion chamber (28).
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