High-Pressure Air Injection on a Low-Head Francis Turbine

Fellenberg, S von; Häussler, W; Michler, W

doi:10.1088/1755-1315/22/1/012031

Cited by 4 publications

(1 citation statement)

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“…To ensure an improvement of the machine behavior and in the wider sense, decrease fatigue damage, detailed prototype site measurements are required. Within this field of research, knowledge has been developed over several years [14,16] including recent works [17,18]. However, most studies dealing with the effects of air admission are done by using test rigs and model machines.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Impact of Air Admission in a Prototype Francis Turbine at Low-Load Operation

2019

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Due to significant changes in the energy system, hydraulic turbines are required to operate over a wide power range. In particular, older turbines which are not designed for these environments will suffer under off-design conditions. In order to evaluate whether or not such a turbine could fulfill the new requirements of the energy market, a study about the behavior of a prototype plant in low-load operation is presented. Therefore, prototype site measurements are performed to determine the most damaging operating point by means of acceleration sensors and pressure transducers. Moreover, unsteady computational fluid dynamics (CFD) simulations considering two-phase flow and two hybrid turbulence models are used to analyze the flow conditions inside the turbine. The resulting pressure pulsations are mapped onto the runner blade to obtain stress and further calculate damage factors. Accordingly, the stresses are compared to those obtained by the strain gauge measurement. Moreover, the influence of active flow control by means of air injection on plant behavior and runner lifetime is discussed as well.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Impact of Air Admission in a Prototype Francis Turbine at Low-Load Operation

2019

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Peripheral air jet injection at part load operation of a low head Francis turbine

KUMAR,

GANDHI

2024

Sādhanā

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Air Injection as a Solution to the Problem for Reducing High-Frequency Acoustic Noise in Some Operating Modes of Francis Hydro Turbines

Dolmatov¹,

Ilin²,

Eliferov³

2021

E3S Web Conf.

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During operation of Francis hydro turbines at the regimes of 70–95 % of Nrated, high-frequency acoustic phenomena (noise) were recorded. In order to study and identify the causes of these phenomena, special field tests were conducted. The main objectives of the tests were: determination of the main frequencies of acoustic phenomena, comparison with natural frequencies of the turbine water passages elements and the search for solutions to reduce acoustic phenomena. During the tests, the natural frequencies of the elements of turbine water path were investigated. Several methods of air injection to the turbine water path were also tested. The most effective way (including by the amount of air) to reduce acoustic phenomena was the air injection from industrial air piping into the spiral case and into the area of guide vanes.

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High-Pressure Air Injection on a Low-Head Francis Turbine

Cited by 4 publications

References 1 publication

Investigation on the Impact of Air Admission in a Prototype Francis Turbine at Low-Load Operation

Investigation on the Impact of Air Admission in a Prototype Francis Turbine at Low-Load Operation

Peripheral air jet injection at part load operation of a low head Francis turbine

Air Injection as a Solution to the Problem for Reducing High-Frequency Acoustic Noise in Some Operating Modes of Francis Hydro Turbines

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