Basic Investigation and Modeling of Three-Dimensional Two Phase Flow through a Compressor Cascade

对于工业燃气轮机，在压缩机入口喷射水雾用于功率增强，用于峰值负荷，此外还用于补偿由于使用风能和太阳能而产生的功率波动。注入的水滴在飞行过程中通过压缩机蒸发并冷却气流。这减少了压缩机的工作，增加了可用功率。此外，还可以提高效率。然而，液滴会对压缩机造成巨大的侵蚀。这是液滴与压气机叶片相互作用的结果。因此，有必要优化这些过程，这是这里提出的项目的重点。本课题的目的在于开发一种数值工具，该工具能够考虑所有相关的流体动力学子过程，可靠地模拟注水的三维过程。这两家申请公司都可以在之前的大量工作中考虑到这一点，这些工作已经在压缩机轮廓周围的二维流动过程中完成。这项工作表明，该过程不能完全在2D中描述，因此需要对不同的详细3D过程进行调查。实验和数值研究、建模以及对这些子过程的考虑是本项目的重点。

For industrial gas turbines the injection of water sprays at the inlet of the compressor is used today for power augmentation, which is used for peak load and in addition for the compensation of power fluctuations due to the usage of wind and solar energy. The injected water droplets evaporate during the flight through the compressor and cool the flow. This reduces the compressor work and increases the usable power. In addition the efficiency might be increased also. However, the droplets can lead to massive erosion in the compressor. This is a result of the interaction between the droplets and the compressor blades. So there is a need for optimizing these processes, which is the focus of the here proposed project.The aim of the here proposed project lies in the development of a numerical tool, which is able to simulate reliably the three dimensional processes of water injection by considering all relevant fluid dynamical sub-processes. Both applicants can count for this on a large amount of previous work, which has been done for such processes for two-dimensional flows around compressor profiles. This work has shown that the process cannot fully been described in 2D and thus the investigation of different detailed 3D processes is needed. The experimental and numerical investigation, modelling and the consideration of these sub-processes are the focal point of the here proposed project.