Experimentation and Modelling of Novel Adaptive Shaft Seals for use in Turbomachinery

与巴斯大学涡轮机械研究小组(TRG)合作开发新型燃气轮机轴封的实验和建模项目。用于减少泄漏的高压和低压涡轮部件之间的密封是透平机械和电动马达的关键部件。大型旋转设备中经常经历的启动和关闭瞬变会导致密封间隙的变化。这对密封的设计提出了挑战，以防止摩擦、减少泄漏和提高转子稳定性，这对达到净零推进力至关重要。可比较的密封设计包括：-迷宫密封，由于低成本和高速度、压力和温度能力而被广泛使用，但存在摩擦和性能下降的问题。-刷式密封和叶片密封分别使用柔性刷毛或叶片，将泄漏性能提高了一个数量级，同时仍然受到橡胶的影响。自适应密封是一种正在开发的设计案例，旨在通过动态适应间隙变化、间隙变化和关闭过程中的更大偏心来适应较大的转子偏心同时保持或改善与同类密封设计相比的泄漏和稳定性性能。该项目旨在通过使用现有的实验设备来提供和验证理论模型，然后用于影响设计，从而提高对适应性密封设计的理解，以适应未来的应用。该设施能够复制和控制密封件的使用条件。该项目的联合赞助商是Cross制造有限公司，该公司是航空航天和发电行业刷式密封件的领先供应商。该项目将与克罗斯密切合作，进行实验，确保有意义的结果在公司得到实施。该项目的另一个期望是，研究通过出版物传播，并在一年一度的ASME涡轮博览会会议上公布。

Experimental and modelling project developing novel shaft seals for gas turbines with The Turbomachinery Research Group (TRG) at the University of Bath. Seals between high- and low-pressure turbine sections to reduce leakage are critical components in turbomachinery and electric motors.Start-up and shut-down transients often experienced in large rotating equipment lead to varying seal clearances. This poses a challenge in designing seals to prevent rubs, reduce leakage and improve rotor stability, critical for reaching net-zero propulsion.Comparable seal designs include:- Labyrinth seals, widely used due to low cost and high speed, pressure and temperature capabilities, but suffer from rubs and diminishing performance.- Brush seals and leaf seals, using flexible bristles or leaves respectively, improve leakage performance over labyrinth seals by an order of magnitude, whilst still suffering from diminishing performance from rubsAdaptive seals are an in-development design case aimed at accommodating larger rotor eccentricities during start-up and shut-down by dynamically accommodating for a changing clearance, whilst maintaining or improving the leakage and stability performance compared to comparable seal designs.This project aims to advance the understanding of adaptive seal designs for future applications by using the already existing experimental facility to inform and validate theoretical models that can then be used to influence design. The facility is capable of replicating and controlling the conditions in seal use-cases.The co-funding sponsor of this project is Cross Manufacturing Ltd., a leading supplier of brush seal components to the aerospace and power generation industries. The project will closely work with Cross to perform experiments and ensure that meaningful results are implemented at the company.It is an additional expectation of the project that research is disseminated through publications and presented at the annual ASME Turbo Expo conference.