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首页> 外文学位 >Effects of fluid properties on the aerodynamic performance of turbomachinery for semi-closed cycle gas turbine engines using molecular oxygen/carbon dioxide combustion.
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Effects of fluid properties on the aerodynamic performance of turbomachinery for semi-closed cycle gas turbine engines using molecular oxygen/carbon dioxide combustion.

机译：流体特性对使用分子氧/二氧化碳燃烧的半封闭循环燃气涡轮发动机的涡轮机械的空气动力性能的影响。

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Many gases, including carbon dioxide and argon, have been considered as alternative working fluids to air in a number of design studies for closed and semi-closed gas turbine cycles.{09}In many of these studies, it has been assumed that if the gas constant R and isentropic exponent γ are included in the speed and flow parameters, the compressor map is applicable to other working fluids. However, similarity arguments show that the isentropic exponent itself is a criterion of similarity and that the turbomachinery characteristics, even when appropriately non-dimensionalized, will in principle vary as the isentropic exponent of the working fluid varies.; A rotating compressor test stand was constructed to measure the aerodynamic performance of a centrifugal compressor. The apparatus operates in closed cycle arrangement to allow for testing of alternative working fluids. The performance of the compressor was measured using air (γ = 1.4), CO 2 (γ = 1.29), and argon (γ = 1.67) as working fluids to determine the influence of the isentropic exponent on the aerodynamic performance of turbomachinery.; For the same value of non-dimensional speed, the pressure ratio, efficiency, and choked flow are significantly different for the three test gases, confirming that the isentropic exponent is an important criterion of similarity. The experimental results have been found to be consistent with a CFD analysis of the impeller, and a meanline analysis of the compressor stage. The changes in performance seen can be predicted reasonably well with simple arguments based mainly on one-dimensional isentropic flow. These arguments form the basis for correction procedures that can be used to project compressor characteristics measured for one value of γ to those for a gas with a different value.*; *This dissertation includes a CD that is compound (contains both a paper copy and a CD as part of the dissertation). The CD requires the following applications: Adobe Acrobat; Internet browser.
机译：在许多针对封闭式和半封闭式燃气轮机循环的设计研究中，许多气体（包括二氧化碳和氩气）已被视为空气的替代工作流体。{09}在许多此类研究中，假设气体常数 R 和等熵指数γ包括在速度和流量参数中，压缩机图适用于其他工作流体。然而，相似性论证表明，等熵指数本身是相似性的标准，并且即使适当地未定尺寸，涡轮机械的特性原则上也会随着工作流体的等熵指数的变化而变化。构造了旋转式压缩机试验台以测量离心式压缩机的空气动力学性能。该设备以封闭循环的方式运行，以允许测试其他工作流体。使用空气（γ= 1.4），CO 2 （γ= 1.29）和氩气（γ= 1.67）作为工作流体来测量压缩机的性能，以确定等熵指数对压缩空气的影响。涡轮机械的空气动力学性能。对于相同的无量纲速度值，三种测试气体的压力比，效率和阻塞流量显着不同，这证明等熵指数是相似性的重要标准。实验结果与叶轮的CFD分析和压缩机级的平均线分析一致。可以简单地以一维等熵流为基础，通过简单的论证就可以很好地预测所看到的性能变化。这些论据构成了校正程序的基础，该校正程序可用于将针对一个γ值测得的压缩机特性与针对具有不同值的气体的压缩机特性进行投影。 *本论文包括一张复合CD（该论文既包含纸质副本，又包含CD）。该CD需要以下应用程序：Adobe Acrobat；网络浏览器。

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