Pressurized air injection in an axial hydro-turbine model for the mitigation of tip leakage cavitation

Rivetti, Arturo; Angulo, Mauricio Abel; Lucino, Cecilia Verónica; Liscia, Sergio Oscar

doi:10.1088/1742-6596/656/1/012069

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…Various optimization strategies have been proposed to suppress the TLV cavitation and operation instability [86,87]. Mass injection of water and aqueous polymer solutions are used to suppress the cavitation inception.…”

Section: Other Parameters and Optimization Methodsmentioning

confidence: 99%

“…Their PIV measurements show that mass injection into the rollup region of the tip-vortex cavitation decreases the flow instability in the tip-vortex core region and enlarges the core size, which further suppresses the cavitation inception. Rivetti et al [87] investigated the pressurized-air injection in a Kaplan turbine model. Their results show that at the cost of slight reduction in efficiency, air injection successfully decreases the fluid force driven by the guide vanes and weakens the operation vibration.…”

Section: Other Parameters and Optimization Methodsmentioning

confidence: 99%

“…Pressurized-air injection Kaplan turbine [87] The fluid force driven by the guide vanes is decreased and the operation vibration is weakened…”

Section: Mass Injectionmentioning

confidence: 99%

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A Review of Tip Clearance in Propeller, Pump and Turbine

2018

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Propellers, pumps, and turbines are widely applied in marine equipment, water systems, and hydropower stations. With the increasing demand for energy conservation and environmental protection, the high efficiency and the stable operation of pumps and turbine have been drawing great attention in recent decades. However, the tip clearance between the rotating impeller and the stationary shroud can induce leakage flow and interact with the main stream, introducing complex vortex structures. Consequently, the energy performance and the operation stability of pumps and turbines deteriorate considerably. Constant efforts are exerted to investigate the flow mechanism of tip-clearance flow and its induced influence on performance. However, due to various pump and turbine types and the complexity of tip-clearance flow, previous works are usually focused on a specific issue. Therefore, a systematic review that synthesizes the related research is necessary and meaningful. This review investigates related research in the recent two decades in the perspectives from fundamental physics to engineering applications. Results reveal the vortex types, trajectory, evolution, and cavitation behaviors induced by tip-clearance flow. It is concluded that the influence characteristics of tip clearance on energy performance are closely related to the machinery type. Tip-clearance size and tip shape are found to be crucial parameters for tip-leakage vortex (TLV). The proposed optimization schemes are also demonstrated to provide inspiration for future research. Overall, this review article provides a coherent insight into the characteristics of tip-clearance flow and the associated engineering-design applications. On the basis of these understandings, comments on conducted research and ideas on future research are proposed.

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Section: Other Parameters and Optimization Methodsmentioning

confidence: 99%

Section: Other Parameters and Optimization Methodsmentioning

confidence: 99%

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A Review of Tip Clearance in Propeller, Pump and Turbine

2018

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“…Понимание влияния инжекции газовой фазы на структуру вихревого течения очень важно, например, при управлении прецессией вихревого жгута в гидротурбинах, когда с целью погасить нежелательные пульсации давления или вывести частоту прецессии вихря из области резонанса производят впуск воздуха под рабочее колесо. Однако большинство работ не рассматривают физику сложного многофазного процесса, не выходя за рамки конкретных технических приложений [28][29][30].…”

Section: Introductionunclassified

Changing of Disturbance Helical Modes in Swirling Flow during Dispersed Gas Phase Injection

Dremov¹,

Skrypkin²,

Шторк³

2019

SJPhys

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Работа посвящена изучению крупномасштабного двойного прецессирующего вихря, возникающего в двухфазном потоке в проточном гидродинамическом вихревом реакторе тангенциального типа. Обнаружен эффект стабилизации и объединения двойной спирали в одиночный квазистационарный колоннообразный вихрь путем инжекции газовой фазы в поток. Изменение структуры течения было зафиксировано посредством техники скоростной визуализации. Количественные измерения, характеризующие структуру течения, проведены с использованием лазерного доплеровского анемометра. Ключевые слова закрученный поток, вихревая камера, прецессирующее вихревое ядро, двойной вихрь Благодарности Исследование выполнено при финансовой поддержке РФФИ в рамках научного проекта № 18-38-00732 мол_а Для цитирования Дремов С. В., Скрипкин С. Г., Шторк С. И. Смена винтовых мод возмущений закрученного течения жидкости при подаче дисперсной газовой фазы // Сибирский физический журнал. 2019. Т. 14, № 1. С. 40-50.

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