Air injection test on a Kaplan turbine: prototype - model comparison

Angulo, Mauricio Abel; Rivetti, Arturo; Díaz, Leonardo; Liscia, Sergio Oscar

doi:10.1088/1755-1315/49/2/022006

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Angulo et al [25] compared the prototype and model cavitation tests of Kaplan turbines and proposed that the model test was consistent with the results of the prototype test in the time and frequency domains, and analyzed the reasons for the differences between test results from the aspects of scale effect and test techniques. In addition, Angulo et al [26] also conducted air injection tests on the prototype and model of the Kaplan turbine, aiming to evaluate the effect of air injection on reducing pressure pulsation. The beneficial effect of air injection was predicted in both model and prototype tests.…”

Section: Introductionmentioning

confidence: 99%

Study on the Cavitation Characteristics of Shroud Clearance in Prototype and Model of a Kaplan Turbine

Zhang,

Luo,

Chen

et al. 2023

Water

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Model tests and model calculations are the most basic means currently available to study the characteristics of the axial-flow pumps and Kaplan turbines in a systematic manner. Large and medium-sized turbine units and axial-flow pumps must rely on model tests and model calculations to ensure the performances of prototype units before designing. The conversions between models and prototypes are mainly carried out through similarity criteria. However, it is difficult to meet all the similarity criteria in the model tests and the similarity conversions, and the hydraulic and cavitation performances of the model and the prototype are often different. In this paper, numerical calculations of shroud clearance cavitation are performed on both the prototype and model using different cavitation coefficients. The results indicate that the prototype and model have a similar clearance cavitation flow regularity when the cavitation coefficient changes, but they have different energy characteristics and cavitation characteristics. In cavitation conditions, the prototype has higher energy characteristics than the model and the critical cavitation coefficient is similar to the model. When the cavitation coefficient is higher than the critical cavitation coefficient, compared to the model, the blade cavitation performance of the prototype is worse, and the clearance cavitation and runner chamber cavitation are more serious. If the cavitation coefficient decreases to the device cavitation coefficient, the runner chamber of the prototype will cavitate, even though the model has not cavitated yet. The comparison of shroud clearance cavitation between the prototype and the model can be used as a reference for the accuracy of similarity conversion results between the model and the prototype. It also has a positive impact on the design and operation of the prototype.

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Section: Introductionmentioning

confidence: 99%

Study on the Cavitation Characteristics of Shroud Clearance in Prototype and Model of a Kaplan Turbine

Zhang,

Luo,

Chen

et al. 2023

Water

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Vibration and Flow Characteristics of a 200 MW Kaplan Turbine Unit under Off-Cam Conditions

Yan,

Chen,

Ren

et al. 2024

Machines

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Kaplan turbine units can adjust their blades to achieve wider outputs without a significant loss of efficiency. The combination of guide vane angle (GVA) and blade angle (BA) is selected based on efficiency curves obtained from cam tests. However, the vibration characteristics are not considered in the test. The vibration and flow characteristics are complex with different combinations of guide vane and blade angles. Different cam relation selection principles lead to varying machine vibration and flow characteristics. In this research, the flow and vibration characteristics were obtained by means of field test and numerical simulation. Vibration, pressure pulsation, and other stability indicators have been extracted and investigated under off-cam conditions. The flow and variation rules of different indicators have been thoroughly researched. The findings suggest that the magnitude of vibration in the X direction surpassed that in the Y direction for the head cover, upper frame, and lower frame under 22 experimental conditions. The disparity between the head cover and upper frame in both directions was not significant, whereas a substantial contrast existed between the lower frame in the X and Y directions. The calculation results indicate that when the guide vane angle was small, vortices appeared near the high-pressure edge of the runner in the vaneless region and caused disorganized flow lines in the runner, and this complex vortex behavior led to multiple frequency components in the pressure pulsation frequency domain. The conclusions provide references for the designers of Kaplan turbine units and improves the operating safety of Kaplan turbine power stations.

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Air injection test on a Kaplan turbine: prototype - model comparison

Cited by 2 publications

References 4 publications

Study on the Cavitation Characteristics of Shroud Clearance in Prototype and Model of a Kaplan Turbine

Study on the Cavitation Characteristics of Shroud Clearance in Prototype and Model of a Kaplan Turbine

Vibration and Flow Characteristics of a 200 MW Kaplan Turbine Unit under Off-Cam Conditions

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