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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Brush Seal Frictional Heat Generation: Test Rig Design and Validation Under Steam Environment
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Brush Seal Frictional Heat Generation: Test Rig Design and Validation Under Steam Environment

机译：电刷密封摩擦生热：蒸汽环境下的试验台设计与验证

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摘要

Sealing technology is a key feature to improve efficiency of steam turbines for both new power stations and modernization projects. One of the most powerful sealing alternatives for reducing parasitic leakages in the blade path of a turbine as well as in shaft sealing areas is the use of brush seals, which are also widely used in gas turbines and turbo compressors. The advantage of brush seals over other sealing concepts is based on the narrow gap that is formed between the brush seal bristle tips and the mating rotor surface together with its radial adaptivity. While the narrow gap between the bristle tips and the rotor leads to a strongly decreased flow through the seal compared with conventional turbomachinery seals, it is important to be aware of the tight gap that can be bridged by relative motion between the rotor and the brush seal, leading to a contact of the bristles and the rotor surface. Besides abrasive wear occurrence, the friction between the bristles and the rotor leads to heat generation which can be detrimental to turbine operation due to thermal effects, leading to rotor bending connected to increasing shaft vibrations. In order to investigate the frictional heat generation of brush seals, different investigation concepts have been introduced through the past years. To broaden the knowledge about frictional heat generation and to make it applicable for steam turbine applications, a new testing setup was designed for the steam test rig of the Institute of Jet Propulsion and Turbomachinery-TU Braunschweig, Germany, enabling temperature measurements in the rotor body under stationary and transient operation in steam by using rotor-integrated thermocouples. Within this paper, the development of the instrumented new rotor design and all relevant parts of the new testing setup is shown along with the testing ability by means of the validation of the test rig concept and the achieved measurement accuracy. First results prove that the new system can be used to investigate frictional heat generation of brush seals under conditions relevant for steam turbine shaft seals.
机译：密封技术是提高新电站和现代化项目的蒸汽轮机效率的关键功能。减少涡轮机叶片路径以及轴封区域中的寄生泄漏的最强大的密封替代方法之一是使用刷式密封，它也广泛用于燃气轮机和涡轮压缩机中。电刷密封件相对于其他密封概念的优势是基于在电刷密封件硬毛尖端和配套的转子表面之间形成的狭窄间隙及其径向适应性。与传统的涡轮机械密封件相比，尽管刷毛尖端和转子之间的狭窄间隙导致通过密封件的流量大大减少，但重要的是要意识到紧密的间隙可以通过转子和电刷密封件之间的相对运动来弥补导致刷毛与转子表面接触。除了产生磨料磨损外，刚毛和转子之间的摩擦还导致产生热量，由于热效应，热量可能不利于涡轮机运行，导致转子弯曲与轴振动的增加有关。为了研究刷式密封件的摩擦发热，在过去的几年中引入了不同的研究概念。为了拓宽摩擦生热的知识并使其适用于汽轮机应用，为德国喷气推进器和涡轮机械研究所-不伦瑞克的蒸汽试验台设计了一种新的测试装置，从而能够测量转子体内的温度通过使用集成转子的热电偶在蒸汽中进行稳态和瞬态运行。在本文中，通过验证试验台概念和实现的测量精度，展示了仪器化的新转子设计和新测试设置的所有相关部分的开发以及测试能力。初步结果证明，该新系统可用于研究与汽轮机轴封相关的条件下电刷密封的摩擦生热。

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  • 来源
    《Journal of Engineering for Gas Turbines and Power》 |2017年第3期|032502.1-032502.9|共9页
  • 作者

    Markus Raben; Jens Friedrichs; Johan Flegler;

  • 作者单位

    TU Braunschweig,Institute of Jet Propulsion and Turbomachinery,Hermann-Blenk-Str., 37,Braunschweig 38108, Germany;

    TU Braunschweig,Institute of Jet Propulsion and Turbomachinery,Hermann-Blenk-Str., 37,Braunschweig 38108, Germany;

    Siemens AG,Power and Gas Division,Rheinstr. 100,Mulheim a. d. Ruhr 45478, Germany;

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