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Keywords: tip clearance
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Proceedings Papers

Proc. ASME. GT2023, Volume 11A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics, V11AT21A020, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-104243
... and extremely tight tip clearances when meshing and excessive runtime problems occur. These challenges are particularly daunting in the design phase when a multitude of geometries and tip clearances may be considered. To remedy this, the tip clearance effect is first classified into three regions, one...
Proceedings Papers

Proc. ASME. GT2023, Volume 4: Controls, Diagnostics, and Instrumentation, V004T05A023, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103264
... clearances to be excessive. In most of commercial engines, interstage seals (ISS) and mid-seals connected to tip clearance control system are designed to schedule seal clearances to maintain cavity pressures and balance purge flow. The system is designed to manage the gap for efficiency but prevent hot gas...
Proceedings Papers

Proc. ASME. GT2023, Volume 4: Controls, Diagnostics, and Instrumentation, V004T05A005, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101223
... Abstract Tip clearance monitoring is essential for the active health monitoring of turbomachinery and their development towards more efficient systems. Proper sensor calibration is paramount to this purpose, frequently being a time-consuming process. This paper introduces a novel in-situ...
Proceedings Papers

Proc. ASME. GT2022, Volume 10A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V10AT29A011, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-80914
... Abstract The leakage flow that is developed between the rotor and the casing of an axial compressor is usually associated with losses and can promote the arising of rotating stall. During its life, an axial compressor can be subject to a variation of the tip clearance due to the aging...
Proceedings Papers

Proc. ASME. GT2022, Volume 10A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V10AT29A014, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-81587
.... As core size is scaled down, the rotor tip clearances do not scale with span, leading to significant efficiency penalties. This paper documents a numerical and experimental effort to mitigate this penalty through design optimization and technology insertion, enabling an estimated 5 to 10% fuel burn...
Proceedings Papers

Proc. ASME. GT2022, Volume 10B: Turbomachinery — Axial Flow Turbine Aerodynamics; Deposition, Erosion, Fouling, and Icing; Radial Turbomachinery Aerodynamics, V10BT30A004, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-80252
... Abstract Deviation and loss have been measured and numerically analyzed in a linear turbine cascade with tip clearance and upstream casing coolant injection. Compared to the case without coolant injection, when a coolant flow of 0.5% of the mainstream mass flow rate with a non-dimensional swirl...
Proceedings Papers

Proc. ASME. GT2022, Volume 10C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V10CT32A012, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-81059
... Abstract The paper presents CFD simulations about the effects of tip clearance and rotor cavities on the performance of a 1.5-stage high-work turbine. The experimental test case to which the simulation results are compared is the 1.5-stage unshrouded high-work turbine investigated by Behr et al...
Proceedings Papers

Proc. ASME. GT2022, Volume 10C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V10CT32A045, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-83478
... of multiple passages makes flow through the three-blade geometry less stable, which causes the rotor to stall earlier. Keywords: CFD, Axial Compressor, Transonic Axial Compressor, Tip Clearance, Leading Edge Tip Vortex, ShockVortex Interaction NOMENCLATURE CFD Computation Fluid Dynamics NPS Naval Postgraduate...
Proceedings Papers

Proc. ASME. GT2022, Volume 10D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Turbomachinery General Interest; Unsteady Flows in Turbomachinery, V10DT37A013, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-82072
... the interaction effect could generate intense tip clearance noise, which could not be cut-off by the duct. Moreover, RI is regarded as a potential indicator for stall and surge. According to previous studies the mechanism of RI could be classified as the unsteady vortex system theory and the shear layer...
Proceedings Papers

Proc. ASME. GT2022, Volume 1: Aircraft Engine; Ceramics and Ceramic Composites, V001T01A030, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-83431
... contraction of casing and control tip clearance automatically during operation. For example, case structure can be cooled and radially contracted by cooling air outside of casing structure and the system is working to minimize the gap and improve turbine performance. However, the current system does...
Proceedings Papers

Proc. ASME. GT2021, Volume 2A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V02AT31A037, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-59899
... Abstract Tip clearance flow is not only the source of undesirable noise but also a potential indicator for critical operating conditions with rotating stall or surge. It can induce blade vibration, which would cause premature blade failure when the vibration is strong enough. The paper presents...
Proceedings Papers

Proc. ASME. GT2020, Volume 10A: Structures and Dynamics, V10AT24A008, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14758
... as the reference section to analyze the variation of the aerodynamic work at different operating points. The influence of reduced frequency, modal component, and tip clearance on aerodynamic damping are analyzed under three operating points. flutter aerodynamic work operating condition reduced frequency...
Proceedings Papers

Proc. ASME. GT2020, Volume 2A: Turbomachinery, V02AT32A045, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-15180
... in a compressor cascade with tip clearance in the present paper. Large eddy simulation was used to better resolve the vortices with more accurate numerical results. The iso-surface of Q criterion in the compressor cascade is captured for recognizing and analyzing the vortex structures. The horse shoe vortices...
Proceedings Papers

Proc. ASME. GT2020, Volume 2B: Turbomachinery, V02BT33A019, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-15295
... Abstract The numerical study is performed by means of an in-house CFD code to investigate the effect of circumferential nonuniform tip clearance due to the casing ovalization on flow field and performance of a turbine stage. A method called fast-moving mesh is used to synchronize the non...
Proceedings Papers

Proc. ASME. GT2020, Volume 2C: Turbomachinery, V02CT35A015, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14613
... Abstract Tip leakage flow is an important factor affecting the efficiency and stability of compressors. It is important to study the tip leakage flow model in the design and performance prediction process of turbomachinery. This work analyzes the existing tip clearance loss prediction model...
Proceedings Papers

Proc. ASME. GT2020, Volume 6: Education; Electric Power, V006T08A006, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-15004
... dos Campos, SP, Brazil ABSTRACT The aim of this work is the evaluation of different mesh types applied in turbomachines area, in this case in an axial turbine stage used in turbopumps (TP) applications. The tip clearance region was considered in this study because it has high influence...
Proceedings Papers

Proc. ASME. GT2009, Volume 7: Turbomachinery, Parts A and B, 273-282, June 8–12, 2009
Publisher: American Society of Mechanical Engineers
Paper No: GT2009-59840
... in a low speed axial flow compressor. The objective of the present paper is thereby confined to study the collective effects of sweep and tip clearance without attempting to suggest an outright new design. In the present numerical work, the performance of Tip Chordline Sweeping (TCS) and Axial Sweeping...
Proceedings Papers

Proc. ASME. GT2002, Volume 5: Turbo Expo 2002, Parts A and B, 127-134, June 3–6, 2002
Publisher: American Society of Mechanical Engineers
Paper No: GT2002-30338
... the impact of varied blade/stage design parameters. Two turbine layouts are defined for identical operating conditions and shaft power. The flow in the unshrouded rotor blade row is analyzed for the influence of varying tip clearance size and the dependency on stage velocity triangles. – Known correlations...
Proceedings Papers

Proc. ASME. GT2004, Volume 4: Turbo Expo 2004, 221-229, June 14–17, 2004
Publisher: American Society of Mechanical Engineers
Paper No: GT2004-53029
... 25 11 2008 Improving sealing between rotating and stationary parts in industrial turbines can significantly increase unit performance. Abradable seals are being developed to reduce blade-tip clearances where an abradable material is placed on the stationary shroud or casing opposite...
Proceedings Papers

Proc. ASME. GT2006, Volume 4: Cycle Innovations; Electric Power; Industrial and Cogeneration; Manufacturing Materials and Metallurgy, 1017-1023, May 8–11, 2006
Publisher: American Society of Mechanical Engineers
Paper No: GT2006-90993
... zirconia ceramic abradable offers a potentially superior combination of thermal shock resistance, abradability and erosion resistance for high temperature turbine seal applications. abradables ceramic abradables sealing tip clearance abradability erosion resistance thermal spray SM2460 Amdry...