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首页> 外文会议>AIAA ground testing conference 2013 >Experimental demonstration of Analyzing an Engine's Exhaust Jet with the Background-Oriented Schlieren Method
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Experimental demonstration of Analyzing an Engine's Exhaust Jet with the Background-Oriented Schlieren Method

机译：面向背景的Schlieren方法分析发动机排气射流的实验演示

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摘要

The regeneration process of jet engines is complex, time-consuming, expensive, and often requires an engine disassembly or boroscopic examination. The reduction of the down time of each engine during the inspection is one of the main challenges for improving the regeneration process. This can be achieved by obtaining the necessary information about damaged components earlier in the regeneration process. The paper presents the application of the Background-Oriented Schlieren (BOS) method for measuring the density distribution of the exhaust jet as a promising approach. In a tomographic set-up, the BOS-method resolves three-dimensional variation in the density pattern of an exhaust jet. By analyzing and comparing the pattern to a design state, conclusions on the condition of the engine's hot gas path components can be drawn. In order to demonstrate the feasibility of this approach, the present paper deals with the tomographic measurement of the exhaust jet of a helicopter engine with a two-stage axial turbine. Two different conditions are measured and compared. In order to simulate a defect which is associated with a change in the temperature distribution, a cold air streak is injected into the exhaust jet. The comparison with the undisturbed reference condition confirms experimentally that even small defects barely mix with the surrounding flow and therefore can be identified with BOS. The present experiments strengthen the hypothesis that tomographic BOS measurements can resolve small density gradients which result from defects in the hot gas path.
机译：喷气发动机的再生过程是复杂，费时，昂贵的，并且经常需要发动机拆卸或检查。减少检查过程中每个发动机的停机时间是改善再生过程的主要挑战之一。这可以通过在再生过程的早期获得有关损坏组件的必要信息来实现。本文介绍了背景导向的Schlieren（BOS）方法在测量废气流密度分布中的应用，这是一种很有前途的方法。在层析成像设置中，BOS方法解决了排气喷嘴密度模式的三维变化。通过分析该模式并将其与设计状态进行比较，可以得出有关发动机热气路径部件状况的结论。为了证明这种方法的可行性，本文研究了具有两级轴向涡轮的直升飞机发动机的排气射流的层析成像测量。测量并比较了两个不同的条件。为了模拟与温度分布的变化相关的缺陷，将冷空气条纹注入排气喷嘴中。与不受干扰的参考条件进行比较，实验证明即使是很小的缺陷也几乎不会与周围的流混合，因此可以使用BOS进行识别。本实验强化了断层BOS测量可以解决由热气路径缺陷引起的小密度梯度的假设。

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  • 会议地点 San Diego CA(US)
  • 作者

    Rafael R. Adamczuk; Ulrich Hartmann; Joerg R. Seume;

  • 作者单位

    Institute of Turbomachinery and Fluid Dynamics, Leibniz Universitaet Hannover, Germany;

    Institute of Turbomachinery and Fluid Dynamics, Leibniz Universitaet Hannover, Germany;

    Institute of Turbomachinery and Fluid Dynamics, Leibniz Universitaet Hannover, Germany;

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