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首页> 外文期刊>International Journal of Aeroacoustics >Towards a quieter low pressure turbine: design characteristics and prediction needs
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Towards a quieter low pressure turbine: design characteristics and prediction needs

机译：迈向更安静的低压涡轮机：设计特性和预测需求

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This article examines Low Pressure Turbine (LPT) noise in modern aircraft and shows how difficult it is to design a quiet LPT. LPT noise has long been neglected in terms of research and prediction capability due to it being considered of lesser importance. Recent developments in LPT design have led to what is termed a "turbine noise storm," in which the LPT is designed to be cut-off but in the end there is significant LPT noise and little or no ability to reduce it. These developments include the trend toward lower blade counts and solidities. The situation is further hurt due to the inability to predict LPT noise, particularly for the new type of designs. The inability to reduce the LPT noise once the engine and airplane is designed is due to there being no available light-weight high-temperature acoustic-lining technology that can be added to fix a LPT noise problem without a significant penalty. In an attempt to understand what makes some engines' LPT quiet while others are very loud, modern turbine designs are characterized into several LPT noise "classes" and important aspects of each class are shown. Finally, the need for a semi-empirical prediction is discussed including what essential elements this prediction needs to have to be relevant to modern aircraft preliminary design.
机译：本文研究了现代飞机中的低压涡轮（LPT）噪声，并说明了设计安静的LPT有多困难。由于LPT噪声的重要性较低，长期以来一直在研究和预测能力方面将其忽略。 LPT设计的最新发展导致了所谓的“涡轮噪声风暴”，其中将LPT设计为可切断的，但最终LPT噪声很大，几乎没有或根本没有降低噪声的能力。这些发展包括减少刀片数量和坚固性的趋势。由于无法预测LPT噪声，尤其是对于新型设计，情况进一步受到伤害。一旦设计了发动机和飞机，便无法降低LPT噪声的原因是，由于没有可用的轻量级高温吸音技术来解决LPT噪声问题，而不会造成重大损失。为了理解是什么使某些发动机的LPT安静而另一些发动机却很大声，现代涡轮机设计被归纳为几个LPT噪声“类别”，并显示了每个类别的重要方面。最后，讨论了对半经验预测的需求，包括该预测需要与现代飞机初步设计相关的哪些基本要素。

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