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Gas turbine engine with differing effective perceived noise levels at differing reference points and methods for operating gas turbine engine
Gas turbine engine with differing effective perceived noise levels at differing reference points and methods for operating gas turbine engine
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机译:在不同参考点处具有不同有效感知噪声水平的燃气涡轮发动机以及用于操作燃气涡轮发动机的方法
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摘要
A gas turbine engine generates noise during use, and one particularly important flight condition for noise generation is take-off. A gas turbine engine has high efficiency together with low noise, in particular from the turbine that drives the fan. The contribution of the turbine noise emanating from the rear of the engine to the Effective Perceived Noise Level (EPNL) is in the range of from 7 EPNdB and 30 EPNdB lower at a take-off lateral reference point than at an approach reference point.
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