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首页> 外文会议>ASME(American Society of Mechanical Engineers) Turbo Expo vol.4 pt.B; 20070514-17; Montreal(CA) >SHUTDOWN MODELLING TO EXTEND ENGINE OPERATION TO EXTREME AMBIENT CONDITIONS
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SHUTDOWN MODELLING TO EXTEND ENGINE OPERATION TO EXTREME AMBIENT CONDITIONS

机译：关机建模以将发动机操作扩展到极端环境

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摘要

This paper presents a discussion of heat soak-back for various gas turbine engine shutdown scenarios, compares with experimental data and discusses how the temperatures at the shutdown point can be used to approximately determine a suitable shutdown procedure for ambient and hot ambient conditions in order to control the bearing soak back peak. The investigation was performed by running the test vehicle at various engine conditions and shutdown procedures while measuring the temperatures at the bearing outer tracks. The data acquisition continued after the engine shutdown until the temperature data showed that the soak-back peak temperature had passed. The tested engine conditions were replicated in a FEM model of the turbine, from which knowledge was gained of the turbine discs temperatures during the shutdown and subsequent cooling down. It was shown that the bearing soak-back and cooling down after shutdown is determined by the cooling down of the turbine discs. The discs are directly affected by the blade temperature reduction, which in turn is depending on how the air trapped in the main gas annulus after the engine has stopped rotating is cooling down. The cooling down of the main annulus air is due to free convection and conduction to the surrounding metal, and cannot be readily predicted with current tools (the air is not moving). Therefore, an approximation of the temperature behaviour is needed. It was decided for the present study to investigate the correlation between the disc temperature at the shutdown point with the bearing soak-back peak temperature and time. It was found that the disc rim temperature at the shutdown point could be used to determine an approximate soak-back peak and thereby the need for motor-overs (MO). The conclusions are that various shutdown procedures and motor over cooling can be used in order to extend the engine operability without expensive bearing redesign.
机译：本文介绍了各种燃气轮机停机情况下的回热问题，并与实验数据进行了比较，并讨论了如何使用停机点的温度来大致确定适用于环境和高温环境的停机程序，以便控制轴承回渗峰值。通过在各种发动机工况和停机程序下运行测试车辆，同时测量轴承外轨道的温度来进行研究。发动机停机后继续进行数据采集，直到温度数据表明已超过回油峰值温度。在涡轮机的FEM模型中复制了测试的发动机工况，从中获得了停机和随后冷却期间涡轮机盘温度的知识。结果表明，停机后轴承的回渗和冷却取决于涡轮盘的冷却。叶片直接受叶片温度降低的影响，叶片温度的降低又取决于发动机停止旋转后滞留在主要气体环带中的空气如何冷却。主要环空空气的冷却是由于自由对流和对周围金属的传导所致，因此无法用现有工具轻易预测（空气不移动）。因此，需要温度行为的近似值。本研究决定研究关闭点的圆盘温度与轴承回吸峰值温度和时间之间的关系。已经发现，停机点处的盘边缘温度可用于确定近似的回渗峰值，从而可确定电机过度运转（MO）。结论是，可以使用各种停机程序和电动机过冷来扩展发动机的可操作性，而无需进行昂贵的轴承重新设计。

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