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Experimental and numerical analyses to enhance the performance of a microturbine diffuser

机译:通过实验和数值分析来增强微涡轮扩散器的性能

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This paper describes design and off-design behavior of a centrifugal compressor of a 100 kW gas turbine used for small scale power generation and establishes the guidelines to improve diffuser performance. The first part of the paper deals with the experimental and numerical tests on the overall machine: An extensive series of tests at different operating points and rotational speeds is performed using steady probe measurements at impeller exit and diffuser exit, the numerical model features a mixing plane at impeller-diffuser interface and therefore neglects the effect Of unsteadiness due to rotor-stator interaction. In the second part of the paper, the true time-dependent rotor-stator interaction is investigated by means of a numerical model where a sliding mesh technique is adopted instead. The unsteady results are then processed and compared with the computed steady flow in the diffuser. Finally, the geometry of the compressor diffuser is optimized using an evolutionary algorithm coupled with a CFD code. (C) 2005 Elsevier Inc. All rights reserved.
机译:本文介绍了用于小规模发电的100 kW燃气轮机离心压缩机的设计和非设计行为,并建立了改善扩压器性能的准则。本文的第一部分涉及整个机器的实验和数值测试:使用在叶轮出口和扩压器出口处的稳定探针测量,在不同的工作点和转速下进行了一系列的测试,数值模型具有混合平面在叶轮-扩散器接口处,因此忽略了由于转子-定子相互作用而引起的不稳定现象。在本文的第二部分中,通过数值模型研究了真正的时间相关的转子-定子相互作用,其中采用了滑动网格技术。然后处理不稳定的结果,并将其与扩散器中计算出的稳定流量进行比较。最后,使用带有CFD代码的进化算法来优化压缩机扩散器的几何形状。 (C)2005 Elsevier Inc.保留所有权利。

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