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SHUTDOWN MODELLING TO EXTEND ENGINE OPERATION TO EXTREME AMBIENT CONDITIONS

机译：关闭建模以将发动机操作扩展到极端环境条件

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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涡轮发动机关闭场景的热浸泡，与实验数据进行比较，并讨论关断点的温度如何用于大致确定适当的关闭过程，以进行环境和热环境条件。控制轴承浸泡峰值。通过在各种发动机条件下运行测试车辆和关闭程序来执行调查，同时测量轴承外轨道处的温度。在发动机关闭之后继续数据采集，直到温度数据显示浸泡峰值温度通过。经过测试的发动机条件在涡轮机的FEM模型中复制，在关闭期间的涡轮盘温度的知识和随后的冷却。结果表明，关闭后轴承浸泡和冷却通过涡轮盘的冷却确定。圆盘直接受到叶片温度降低的影响，这反过来取决于发动机停止旋转后的主气环中的空气是如何冷却的。主环空气的冷却是由于自由对流和对周围金属的传导，并且不能用电流工具（空气不移动）容易地预测。因此，需要温度行为的近似。据确定，本研究研究了轴承浸泡峰值温度和时间的关闭点处的盘温之间的相关性。发现关闭点的盘边缘温度可用于确定近似的浸泡峰，从而需要对电动机（Mo）的需求。结论是可以使用各种关机程序和电机，以便在没有昂贵的轴承重新设计的情况下扩展发动机可操作性。

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