Experimental analysis and modeling of the losses in the tip leakage flow of an isolated, non-rotating blade setup

Deveaux, Benjamin; Fournis, Camille; Brion, Vincent; Marty, Julien

doi:10.1007/s00348-020-02957-z

Cited by 12 publications

(20 citation statements)

References 34 publications

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“…In order to reduce the constraint range of modeling, within the constraint range, the establishment of adolescent obesity aerobic exercise model is simplified by particle swarm optimization (PSO) algorithm, which avoids the shortcomings of traditional methods. Finally, its performance is verified by simulation [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of the Relationship between Aerobic Exercise and Obesity Reduction in Adolescents

2022

Journal of Healthcare Engineering

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In order to solve the relationship between youth aerobic exercise and obesity reduction, an improved ant colony algorithm-oriented aerobic exercise method was proposed. Firstly, the changes in body shape, weight, BMI, body fat, body circumference, and other indicators of obese adolescents before and after aerobic exercise were used as the initial pheromone distribution matrix, and the random evolution factor and evolutionary drift threshold were introduced to establish the target function of reducing obesity caused by aerobic exercise in adolescents. The constraint conditions of the relationship between aerobic exercise and adolescent obesity reduction were explained, and the particle algorithm was introduced to establish the optimal model of aerobic exercise for adolescent obesity reduction. The experimental results show that with the increasing number of experiments, the advantages of this method are more obvious. From the overall level, the average modeling error of this method is about 0.053%, while the average error of the traditional method is about 0.186%, which shows that this method can control the error within a reasonable range, and it is proved that the improved ant colony algorithm can have a good correlation with the method of aerobic exercise.

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Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of the Relationship between Aerobic Exercise and Obesity Reduction in Adolescents

2022

Journal of Healthcare Engineering

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“…indicates that the blowing leads also to an increase in the blade work at the tip and/or a decrease in the losses (the profile losses close to the tip, as the flow is realigned with the blade inlet angle and certainly also to the losses associated with the secondary gap flows, as demonstrated in the case of an isolated blade, for some blowing configurations [22]).…”

Section: Continuous Modementioning

confidence: 99%

Stall Margin Improvement in an Axial Compressor by Continuous and Pulsed Tip Injection

Moubogha

Margalida

Joseph

et al. 2022

IJTPP

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Stall and surge are strong limitations in the operating range of compressors and thus one of the major limits of jet engine performance. A promising way to push the stability limit of compression machines is to inject a small amount of flow at the blade tip to alter the physical mechanism responsible for stall onset. This study focuses on the experimental performance of such a system. To do so, an axial compressor test bench was equipped with 40 actuators connected to an auxiliary pressurised air supply system. They were able to generate high-speed jet blowing just at the tip of the rotor blades. The opening of each actuator was controlled by an electromagnetic valve. This allowed generating continuous or pulsed jets with frequencies up to 500 Hz at different duty cycles. The performance of the control system was investigated for various control strategies, where the injected flow rate, the injection angle, the number of injectors, the jet frequency and the duty cycle were systematically varied. This paper is concluded by a study of the energy balance of the system for various configurations. To the best of the authors’ knowledge, this constitutes a rarely seen analysis in the literature.

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“…The flow visualization measurements were taken on the cavitation measuring station. The approach to investigating the turbine blade flow properties in a separate tunnel experiment was similar to that used in [24]. A closed-type cavitation measuring station was used as shown in Figure 7.…”

Section: Cavitation Tunnel Measurementsmentioning

confidence: 99%

Analysis of Bulb Turbine Hydrofoil Cavitation

et al. 2021

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The influence of a bulb runner blade hydrofoil shape on flow characteristics around the blade was studied. Experimental work was performed on a bulb turbine measuring station and a single hydrofoil in a cavitating tunnel. In the cavitation tunnel, flow visualization was performed on the hydrofoil’s suction side. Cavitation structures were observed for several cavitation numbers. Cavitation was less intense on the modified hydrofoil than on the original hydrofoil, delaying the cavitation onset by several tenths in cavitation number. The results of the visualization in the cavitation tunnel show that modifying the existing hydrofoil design parameters played a key role in reducing the cavitation inception and development, as well as the size of the cavitation structures. A regression model was produced for cavitation cloud length. The results of the regression model show that cavitation length is dependent on Reynolds’s number and the cavitation number. The coefficients of determination for both the existing and modified hydrofoils were reasonably high, with R2 values above 0.95. The results of the cavitation length regression model also confirm that the modified hydrofoil exhibits improved the cavitation properties.

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Experimental analysis and modeling of the losses in the tip leakage flow of an isolated, non-rotating blade setup

Cited by 12 publications

References 34 publications

Modeling and Analysis of the Relationship between Aerobic Exercise and Obesity Reduction in Adolescents

Modeling and Analysis of the Relationship between Aerobic Exercise and Obesity Reduction in Adolescents

Stall Margin Improvement in an Axial Compressor by Continuous and Pulsed Tip Injection

Analysis of Bulb Turbine Hydrofoil Cavitation

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