Measurements of the tip leakage vortex structures and turbulence in the meridional plane of an axial water-jet pump

Wu, Huixuan; Miorini, Rinaldo L.; Katz, Joseph

doi:10.1007/s00348-010-0975-0

Cited by 145 publications

(61 citation statements)

References 36 publications

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“…Katz group has presented an alternative form of TKE equation based on such curvilinear coordinates [32,33]. Using that, the contributions of several Reynolds stress components to the kinetic energy production can be elucidated in the wake.…”

Section: Features Of Tke At Wakementioning

confidence: 99%

“…According to previous work [32,33], the TKE production term ⟨ ⟩( / ) in (6) can be decomposed into four terms, that is, the normal stresses production term , shear stress production term , curvature production term , and three-dimensional production term . The following data are derived from running conditions at 11 ∼60 r/min and ranging from 10 to 18 mm.…”

Section: Features Of Tke At Wakementioning

confidence: 99%

“…Recently, Katz group has provided a detailed study on the tip region flow within several blade cascades in a waterjet pump; the distinguished results of velocity fields, vorticity distribution, and turbulent kinetic energy (TKE) were obtained by using PIV for a full-transparent blade cascade and endwall [32,33]. It was worth noting that the kinematic features of wake after the stator airfoil have been studied, which could tell how the energy is transported during the wake interaction.…”

Section: Introductionmentioning

confidence: 99%

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On the Flow Instabilities and Turbulent Kinetic Energy of Large-Scale Francis Hydroturbine Model at Low Flow Rate Conditions

et al. 2014

Advances in Mechanical Engineering

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This paper is to make a better understanding of the flow instabilities and turbulent kinetic energy (TKE) features in a largescale Francis hydroturbine model. The flow instability with aspect of pressure oscillation and pressure-velocity correlation was investigated using large eddy simulation (LES) method along with two-phase cavitation model. The numerical simulation procedures were validated by the existing experimental result, and further the TKE evolution was analyzed in a curvilinear coordinates. By monitoring the fluctuating pressure and velocities in the vanes' wake region, the local pressure and velocity variations were proven to have a phase difference approaching /2, with a reasonable cross-correlation coefficient. Also the simultaneous evolution of pressure fluctuations at the opposite locations possessed a clear phase difference of , indicating the stresses variations on the runner induced by pressure oscillation were in an odd number of nodal diameter. Considering the TKE generation, the streamwise velocity component ⟨ 2 ⟩ contributed the most to the TKE, and thus the normal stress production term and shear stress production term imparted more instability to the flow than other production terms.

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Section: Features Of Tke At Wakementioning

confidence: 99%

Section: Features Of Tke At Wakementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Flow Instabilities and Turbulent Kinetic Energy of Large-Scale Francis Hydroturbine Model at Low Flow Rate Conditions

et al. 2014

Advances in Mechanical Engineering

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“…Течения в зазоре, влияющие на «ак-тивный поток», изучены в иностранной литературе [10,[13][14][15]. При проектирова-нии оседиагонального колеса они не учи-тывались.…”

Section: рис 5 распределение осевой скорости (модель с зазором) в зunclassified

Modeling of stall cavitation sensitivity of a booster turbopump assembly and comparison between experimental and numerical results

Казеннов

Каналин

Полетаев

et al. 2014

VESTNIK of Samara University. Aerospace and Mechanical Engineer

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Научно-производственное объединение «Энергомаш имени академика В.П. Глушко», г. Химки Московской области В настоящее время в двигателях больших и малых тяг отечественных и зарубежных конструкций для уменьшения давления в баках применяются шнековые бустерные насосы (БН). Как и в любых гид-равлических устройствах там возможно появление кавитации. Для определения кавитационных характе-ристик шнековых и шнекоцентробежных насосов получен ряд эмпирических формул, которые не до конца учитывают все геометрические особенности шнеков переменного шага. В современных програм-мах численного трёхмерного моделирования применяются различные модели кавитации, используя ко-торые можно получить кавитационные свойства любой геометрии, однако методик расчётов нет. В дан-ной статье представлены результаты моделирования течения в бустерном насосе и их сравнение с экспе-риментом. Моделирование проводилось с использованием ANSYS CFX. Явление кавитации моделиро-валось в стационарной постановке с учётом кавитационной модели Релея-Плессета. Геометрическая модель состояла из оседиагонального колеса и лопаточного спрямляющего аппарата. Моделирование проводилось в модели как с зазором, бандажом и шероховатостью, так и без них. На основе этого разра-ботана методика расчёта срывной кавитационной кривой при помощи ANSYS CFX. Рэлея -Плессета, напор. Оседиагональный бустерный турбонасосный агрегат, зазор, кавитация, кавитационная модель

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“…Wu et al [7][8][9][10] performed a series of experiments by using particle image velocimetry measurements to study the flow structures in the tip region of a water-jet pump rotor, including the tip clearance flow, tip leakage vortex and cavitation flow; they found that the tip leakage vortex started to form near the suction-side edge of a blade tip and appeared as a swirling jet, migrating to the middle of the blade passage. The backward leakage flow penetrated into the passage and created a shear layer in the interface with the main flow.…”

Section: Introductionmentioning

confidence: 99%

Energy Performance and Radial Force of a Mixed-Flow Pump with Symmetrical and Unsymmetrical Tip Clearances

et al. 2017

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Abstract: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. The center of the radial force on the principal axis is located at the coordinate origin when the tip clearance is symmetrical, and moves to the third quadrant when the tip clearance is unsymmetrical. Analysis results show that the total radial force on the principal axis is closely related to the fluctuation of mass flow rate in each single flow channel. Unsteady simulations show that the dominant frequencies of radial force on the hub and blade correspond to the blade number, vane number, or double blade number because of the rotor stator interaction. The radial force on the blade pressure side decreases with the tip clearance increase because of leakage flow. The unsymmetrical tip clearances in an impeller induce uneven leakage flow rate and then result in unsymmetrical work ability of each blade and flow pattern in each channel. Thus, the energy performance decreases and the total radial force increases for a mixed flow pump with unsymmetrical tip clearance.

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Measurements of the tip leakage vortex structures and turbulence in the meridional plane of an axial water-jet pump

Cited by 145 publications

References 36 publications

On the Flow Instabilities and Turbulent Kinetic Energy of Large-Scale Francis Hydroturbine Model at Low Flow Rate Conditions

On the Flow Instabilities and Turbulent Kinetic Energy of Large-Scale Francis Hydroturbine Model at Low Flow Rate Conditions

Modeling of stall cavitation sensitivity of a booster turbopump assembly and comparison between experimental and numerical results

Energy Performance and Radial Force of a Mixed-Flow Pump with Symmetrical and Unsymmetrical Tip Clearances

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