Experimental measurement of the flow-induced pulsation in a hydrodynamic turbomachinery stator and its pressure fluctuation characteristics

Ke, Zhifang; Wei, Wei; Liu, Cheng; Yan, Qingdong; Wood, Houston G.

doi:10.1016/j.jestch.2021.07.005

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…Recently, Ke et al 31 posit that the turbine runner position with respect to the stator can be analyzed in the time and space domain defined by a trigonometric function that can be instrumental to system design.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental investigation of 3D unsteady flow fields of a low head axial flow turbine under different blade number

Yang

Ohiemi

Singh

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Low-head axial flow turbines (LHAFT) are important turbomachines suitable for converting low-head water (potential energy) into mechanical (kinetic) or electrical energy. The performance characteristics of this kind of turbine are an essential aspect of its design and operational life cycle. Nevertheless, pressure fluctuations within the turbine affect its operational reliability. Hence its fluctuation characteristics cannot be overlooked due to its influence on vibration, noise, and severity of performance. It is essential to investigate the zones associated with high unsteadiness and turbulence. Furthermore, blade number and variation in flow rate are other important, influential factors on the level of pressure fluctuations. Given the above, numerical and experimental investigation of pressure fluctuation intensities within the flow channels of the LHAFT model under different blade numbers was carried out in this study. The results posit that the pulsating pressure coefficient decreases gradually from the inflow to the guide vane but increases at the runner, then falls as the flow progresses in the outlet pipe. At the runner, the flow experienced the most irregular flow patterns in the turbine. All three runner cases were operated with nine guide vanes, but after one complete revolution, blade numbers z = 2, 3, and 4 revealed regular pressure fluctuations, respectively, in the stationary part (guide vane, inlet and outlet pipes). Regardless of the case study, nine (9) regular peaks and valleys of pressure pulses matching the number of vanes on the static vane were recorded in the runner flow passage. The flow interaction between the static vane and runner is responsible for the pressure fluctuation, which influences the turbine’s vibration and noise. The obtained results would be an essential reference to noise and vibration analytical studies in turbines to optimize them for improved operational reliability.

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Section: Introductionmentioning

confidence: 99%

“…They investigated the transient pressure pulsations in the off-design region using delayed detached eddy simulation. 30 Recently, Ke et al 31 posit that the turbine runner position with respect to the stator can be analyzed in the time and space domain defined by a trigonometric function that can be instrumental to system design.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of 3D unsteady flow fields of a low head axial flow turbine under different blade number

Yang

Ohiemi

Singh

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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The dynamic response of a pressure transducer for measurements in water

Jentzsch,

Lechner,

Woszidlo

et al. 2024

Exp Fluids

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Dynamic pressure measurements are indispensable in the field of fluid mechanics. Attaching tubing as a transmission line to the pressure transducer is often unavoidable but significantly reduces the usable bandwidth of the measurement system. Complex fluid-wall interactions and potential outgassing of air are present within systems with water-filled tubes. Comprehensive studies aiding researchers in selecting suitable transmission line parameters (i.e., material, length, and diameter) are not available. A simple calibration apparatus is designed for the frequency response characterization of multiple pressure transducers simultaneously applying a pressure step. The setup is thoroughly characterized and a detailed description is provided to optimize the bandwidth. A piezoresistive pressure transducer attached to water-filled tubes, as commonly used in hydrodynamic experiments, is characterized in the low-frequency range (i.e., $$f \le {300}$$ f ≤ 300 Hz). Tube-related effects, such as length, diameter, and material are investigated. The impact of entrapped air within the tubing is analyzed. The feasibility of substituting water with silicone oil to fill the tubes is explored. To optimize the usable bandwidth of the pressure measurement system for dynamic applications, it is essential to maintain short tubing that is as rigid as possible and free from entrapped air. Pressure wave propagation speed is reduced by two orders of magnitude in elastic transmission lines made of silicone. Pressure corrections through dynamic calibration are challenging due to the system’s sensitivity to various parameters affecting the dynamic response.

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Effect of blade length on unsteady cavitation characteristics of hydrodynamic torque converter

Zhang,

Wang,

Yan

et al. 2024

Energy

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Experimental measurement of the flow-induced pulsation in a hydrodynamic turbomachinery stator and its pressure fluctuation characteristics

Cited by 4 publications

References 24 publications

Numerical and experimental investigation of 3D unsteady flow fields of a low head axial flow turbine under different blade number

Numerical and experimental investigation of 3D unsteady flow fields of a low head axial flow turbine under different blade number

The dynamic response of a pressure transducer for measurements in water

Effect of blade length on unsteady cavitation characteristics of hydrodynamic torque converter

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