Investigation and Analysis of Attack Angle and Rear Flow Condition of Contra-Rotating Small Hydro-Turbine

Ding, Nan; Shigemitsu, Toru; Zhao, Shengdun

doi:10.3390/en11071806

Cited by 6 publications

(7 citation statements)

References 21 publications

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“…The counter-rotating principle is also applied to aircraft and marine propellers. Various studies on hydraulic counter-rotating axial pico-and microturbines for potential applications in water infrastructures have been published [25][26][27]. The counter-rotating concept is also known in the field of hydraulic axial flow pumps [28].…”

Section: Hydroturbine Concept 221 Turbine Principlementioning

confidence: 99%

DuoTurbo: Implementation of a Counter-Rotating Hydroturbine for Energy Recovery in Drinking Water Networks

Biner¹,

Hasmatuchi²,

Rapillard³

et al. 2021

Sustainability

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To enhance the sustainability of water supply systems, the development of new technologies for micro scale hydropower remains an active field of research. The present paper deals with the implementation of a new micro-hydroelectric system for drinking water facilities, targeting a gross capacity between 5 kW and 25 kW. A counter-rotating microturbine forms the core element of the energy recovery system. The modular in-line technology is supposed to require low capital expenditure, targeting profitability within 10 years. One stage of the DuoTurbo microturbine is composed of two axial counter-rotating runners, each one featured with a wet permanent magnet rim generator with independent speed regulation. This compact mechanical design facilitates the integration into existing drinking water installations. A first DuoTurbo product prototype is developed by means of a Computational Fluid Dynamics based hydraulic design along with laboratory tests to assess system efficiency and characteristics. The agreements between simulated and measured hydraulic characteristics with absolute errors widely below 5% validate the design approach to a large extent. The developed product prototype provides a maximum electrical power of 6.5 kW at a maximum hydraulic head of 75 m, reaching a hydroelectric peak efficiency of 59%. In 2019, a DuoTurbo pilot was commissioned at a drinking water facility to assess its long-term behavior and thus, to validate advanced technology readiness levels. To the best of the authors knowledge, it is the first implementation of a counter-rotating microturbine with independent runner speed regulation and wet rim generators in a real-world drinking water facility. A complete year of operation is monitored without showing significant drifts of efficiency and vibration. The demonstration of the system in operational environment at pre-commercial state is validated that can be attributed to a technology readiness level of 7. The overall results of this study are promising regarding further industrialization steps and potential broad-scale applicability of the DuoTurbo microturbine in the drinking water industry.

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Section: Hydroturbine Concept 221 Turbine Principlementioning

confidence: 99%

DuoTurbo: Implementation of a Counter-Rotating Hydroturbine for Energy Recovery in Drinking Water Networks

Biner¹,

Hasmatuchi²,

Rapillard³

et al. 2021

Sustainability

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show abstract

“…21 The attack angles and flow conditions of rear rotor were compared between the original model and new model. 22 In this paper, a new transparent casing for the measurement of pressure fluctuation is manufactured, and pressure fluctuation experiments of original model and new model are conducted. The aim of this paper is to investigate the difference of pressure fluctuation between the original model and new model.…”

Section: Introductionmentioning

confidence: 99%

“…21 The attack angles and flow conditions of rear rotor were compared between the original model and new model. 22…”

Section: Introductionmentioning

confidence: 99%

Pressure fluctuation on casing wall and investigation to tip leakage flow of contra-rotating small hydro-turbine

Ding

Shigemitsu

Ikebuchi

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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Renewable energy is strongly recommended to replace the traditional fossil fuels to solve the severe environmental pollution. However, small hydro-turbine performs lower efficiency, and it is also easy to be blocked and impacted. Therefore, the contra-rotating rotors are adopted to overcome the disadvantages of small hydro-turbine. The performance and internal flow condition of contra-rotating small hydro-turbine have been clarified. In this paper, a new transparent casing is manufactured, and pressure fluctuation experiments are conducted. The pressure fluctuation experiments are to clarify the pressure fluctuation during the running of contra-rotating small hydro-turbine. Then the hydraulic stability of contra-rotating small hydro-turbine can be further investigated. According to the experiment results, for the new model, most of the amplitudes of pressure fluctuation are decreased. The maximum decreasing percentage of peak-to-peak value is 74.22%, and it is appeared on the point of Pr3. On frequency domain, the dominant frequencies of pressure fluctuation are rotation frequency and blade passing frequency. The investigation to tip leakage flow of contra-rotating small hydro-turbine is conducted based on the pressure fluctuation experiment and numerical simulation. The tip leakage vortex is identified by Q-criterion. The pressure distributions in tip clearance area show that the tip leakage vortex of new model is suppressed, and this helps to reduce the amplitude of pressure fluctuation in tip clearance area.

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“…The Energy Development Strategic Action Plan (2014-2020) clearly states that by 2020, the total installed capacity of hydropower will reach 350,000 MW [3]. Therefore, hydropower is considered a promising renewable energy source [4].…”

Section: Introductionmentioning

confidence: 99%

Seepage Safety Assessment of Concrete Gravity Dam Based on Matter-Element Extension Model and FDA

Wang

et al. 2019

Energies

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As an important infrastructure project, the concrete gravity dam plays an extremely important role in hydropower generation, irrigation, flood control, and other aspects. Seepage is an important factor affecting the stability of concrete gravity dams. Seepage safety assessment is of great significance to the safe operation of the dams. However, the existing seepage safety assessment models are not dynamic, and the correlation among indicators is often neglected and the overall seepage safety of the concrete gravity dams has not been considered. To solve these problems, this research proposes a dynamic matter-element extension (D-MEE) model. First, the D-MEE model is established through adroit integration of the matter-element extension (MEE) model and functional data analysis (FDA). Second, a dynamic criteria importance through the intercriteria correlation (D-CRITIC) method that can effectively consider the correlation among indicators is proposed to determine the weights. Third, the influence of different dam blocks on the overall seepage safety status is considered by constructing a spatial weight matrix. Finally, the proposed method is applied to the concrete gravity dam X in southwest China. The results show that the proposed method is effective and superior to the existing evaluation methods of seepage safety.

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Investigation and Analysis of Attack Angle and Rear Flow Condition of Contra-Rotating Small Hydro-Turbine

Cited by 6 publications

References 21 publications

DuoTurbo: Implementation of a Counter-Rotating Hydroturbine for Energy Recovery in Drinking Water Networks

DuoTurbo: Implementation of a Counter-Rotating Hydroturbine for Energy Recovery in Drinking Water Networks

Pressure fluctuation on casing wall and investigation to tip leakage flow of contra-rotating small hydro-turbine

Seepage Safety Assessment of Concrete Gravity Dam Based on Matter-Element Extension Model and FDA

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