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Blade Tips - Clearance and Its Control [PDF]
Mechanical Engineering, 2013 This article focuses on studying blade tip clearance phenomena. It is important to realize that to be freely turning, a blade (or a cantilevered stator) must have a clearance gap between its tip and the engine casing (or hub). Such clearances introduce aerodynamic losses, decreasing gas turbine efficiency.
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AIP Advances, 2023 Internal steam leakage in steam turbines from the high-pressure side to the low-pressure side through clearances causes loss, resulting in reduced efficiency and potentially compromising the safe operation of the turbine.
Zhijia Lv +5 more
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Energies, 2021 To explain the effect of tip leakage flow on the performance of an axial-flow transonic compressor, the compressors with different rotor tip clearances were studied numerically. The results show that as the rotor tip clearance increases, the leakage flow
Botao Zhang +3 more
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Energies, 2017 The energy performance and radial force of a mixed flow pump with symmetrical and unsymmetrical tip clearance are investigated in this paper. As the tip clearance increases, the pump head and efficiency both decrease.
Yue Hao +5 more
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Machines, 2022 In order to study the influence of tip clearance on the performance and energy dissipation of the axial-flow pump and the axial-flow pump as a turbine, and find the location of high dissipation rate, this study took an axial-flow pump model as its ...
Yanjun Li +4 more
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Aerospace, 2023 In an axial-flow turbine of a jet engine used for aircraft propulsion, the passage vortex (PV) and tip leakage vortex (TLV) generated inside the blade passage deteriorate the aerodynamic performance.
Takayuki Matsunuma, Takehiko Segawa
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Tubomachinery blade vibration amplitude measurement through tip timing with capacitance tip clearance probes [PDF]
Sensors and Actuators A: Physical, 2005 Abstract Turbomachinery blade vibrations can cause high cycle fatigue (HCF), which reduces blade life. In order to observe this vibration a non-intrusive monitoring system is sought. The vibration can be detected by measuring blade tip timing since in the presence of vibration the blade timing will differ slightly from the passing time calculated ...
Lawson, Craig P., Ivey, Paul C.
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Energy Performance and Flow Patterns of a Mixed-Flow Pump with Different Tip Clearance Sizes
Energies, 2017 Tip clearance between blade end and shroud is inevitable in pump operation and of great importance on pump energy performance and pressure fluctuation. As the tip clearance size increases, the head and efficiency of the mixed flow pump drop accordingly ...
Yabin Liu, Lei Tan, Yue Hao, Yun Xu
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Leakage Flow Characteristics in Blade Tip of Shaft Tubular Pump
Journal of Marine Science and Engineering, 2023 The shaft tubular pump device is widely used in various water diversion projects because of its ultra-low head and large flow characteristics. Due to the tip clearance between the blade and the shroud, it is easy to cause hydraulic mechanical performance
Zhikang Lin +5 more
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Influence of the Tip Clearance on the Aeroelastic Characteristics of a Last Stage Steam Turbine
Applied Sciences, 2019 In this paper, the tip clearance effects on the aeroelastic stability of a last-stage steam turbine model are investigated. Most of the unsteady aerodynamic work contributing to flutter of the long blades of the last-stage of a steam turbine is done near
Tianrui Sun +3 more
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