RUI/MRI: Acquisition of Instrumentation for Experimentally Investigating Rotor-Tip Clearance Flow Phenomena in Gas-Turbine Engines

ABSTRACTProposal没有。cts -0320305首席研究员：M. Khan，塔斯基吉大学目前正在大力开发超高效发动机技术。评估的因素包括燃油效率、噪音和环境影响。压气机（和透平）中静、动叶片之间的相互作用对这些因素影响很大。在众多变量中，旋翼叶尖与机匣之间的间隙被认为对发动机的燃油效率和噪声有最显著的影响。为了更好地了解叶顶区域的流场，使发动机设计对叶顶间隙的影响不那么敏感，已经进行了大量的实验和数值研究。最近使用的掠型叶片进一步增加了该区域流动的复杂性。早前的研究已经报道了由于掠向而产生的轴向应变率对叶片-轮毂结合处的涡动结构的影响。在这笔拨款下购买的仪器将用于研究轴向应变率对尖端间隙区域流动物理的影响。利用本方案获得的2DPIV系统和水洞来绘制该构型的流场图。通过分析叶尖间隙区流动的平均和湍流特性来了解其物理特性。还将研究横扫和间隙变化的影响。叶片与模拟机匣之间相对运动的影响也将被记录下来。这种研究仪器在塔斯基吉大学的可用性将使教师能够进行有竞争力的研究。塔斯基吉大学的学生参与流体力学研究和接触流体现象的现代测量技术将是这种仪器的一个极其有益的结果。航天科学工程系的其他实验课程也将利用该仪器加强本科生的理论概念。

ABSTRACTProposal No. CTS-0320305Principal Investigator: M. Khan, Tuskegee UniversityExtensive efforts are currently underway to develop ultra efficient engine technology. Factors being evaluated are fuel efficiency, noise and environmental impact. The interaction between stator and rotor blades in the compressor (and turbine) greatly influence these factors. Of the many variables, the clearance between the rotor blade tip and the casing has been cited to have the most significant impact on engine fuel efficiency and noise. Extensive experimental and numerical efforts have been directed towards a better understanding of the flow field in the tip region in order to desensitize engine design to the influences of the rotor tip clearance. The recent use of swept blades has introduced further complexities in the flow in this region. Earlier investigations have reported that the axial strain rates generated due to the sweep impact the vortical structures in a blade-hub juncture. The instrumentation procured under this grant will be used to investigate the influence of axial strains rates on the flow physics of the tip clearance region. The 2DPIV system and water tunnel acquired under this proposal will be utilized to map the flow field of such a configuration. Mean and turbulent characteristics of the flow in tip clearance region would be analyzed to understand the physics. The impact of changes in sweep and clearance would also be studied. The influence of relative motion between the blade and simulated casing would also be documented. The availability of this research instrumentation at Tuskegee University will enable the faculty to conduct competitive research. Involvement of students at Tuskegee University in fluid mechanics research and exposure to modern measurement techniques of fluid phenomena would be an extremely beneficial consequence of this instrumentation. Other laboratory courses in the Aerospace Science Engineering Department will also utilize the instrumentation to strengthen theoretical concepts for undergraduates.