Performance prediction of a prototype tidal power turbine by using a suitable numerical model

Ahn, Soo-Hwang; Xiao, Yexiang; Wang, Zhengwei; Zhou, Xuezhi; Luo, Yongyao

doi:10.1016/j.renene.2017.06.021

Cited by 32 publications

(8 citation statements)

References 27 publications

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“…The momentum source term in the x direction was calculated from first principles and is given as: [6] where ∆𝜉 × ∆𝜂 is the area of the source/sink discharge; u is the local velocity at the source point, h is the water depth; and u s is the jet velocity through the source point, which was considered as the flow velocity through the hydraulic structure, as shown in Figure 3. However, due to the fast-changing velocity in the turbine housing [53], the value selected to define u s is uncertain. Therefore, different values of u s were applied and compared in this study.…”

Section: Momentum Conservation Across the Structurementioning

confidence: 99%

Refined hydro-environmental modelling for tidal energy generation: West Somerset Lagoon case study

2021

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Section: Momentum Conservation Across the Structurementioning

confidence: 99%

Refined hydro-environmental modelling for tidal energy generation: West Somerset Lagoon case study

2021

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“…1 Power turbines are also used in small and medium-sized industrial gas turbines, etc. 2–4 The use of power turbines brings the following advantages to marine and aviation gas turbines: (1) The power turbine rotor and the gas generator rotor are not on the same axis, so the power turbine can operate independently according to a given rule, and the load adjustment is flexible, which is very important for improving the control performance, and it is conducive to the start and acceleration of the gas generator; (2) Power turbines with corresponding rotational speeds can be designed for different load requirements, so as to better adapt to the propeller of ships or aircrafts; (3) For aeroderivative marine gas turbines, by adding power turbines downstream of the aircraft carrier (turbojet/turbofan), it can make full use of the advanced technology of the parent engine and reduce development risks and costs; (4) By adopting variable geometry guide vane technology on the power turbine, it can greatly improve the thermal efficiency and stability potential of gas turbine/aircraft under off-design conditions.…”

Section: Introductionmentioning

confidence: 99%

“…1 Power turbines are also used in small and medium-sized industrial gas turbines, etc. [2][3][4] The use of power turbines brings the following advantages to marine and aviation gas turbines: (1) The power turbine rotor and the gas generator rotor are not on the same axis, so the power turbine can operate independently according to a given rule, and the load adjustment is flexible, which is very important for improving the control performance, and it is conducive to the start and acceleration of the gas generator;…”

Section: Introductionmentioning

confidence: 99%

Advances in aerodynamics of power turbines for marine and aviation applications

Gao

Zhao

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The use of power turbines has the advantage of flexible output load adjustment, and is a major configuration of marine gas turbines and aviation turboshaft/turboprop engines. Marine gas turbines and aviation turboshafts and turboprop engines generally have multiple working states and multiple working conditions change laws, which cause the aerodynamic performance of power turbines to fluctuate greatly with changes in working conditions, and different variable working conditions have a severe impact on the turbine loss characteristics. Therefore, it is necessary to deeply understand the internal flow mechanism of power turbines under off-design working conditions in different power turbine application modes, and carry out researches on the design methods of power turbines under wide working conditions. This paper summarizes and analyzes the recent advances in the field of aerodynamics of power turbines for marine and aviation applications. This review covers the following topics that are important for power turbine designs: (1) turbine flow loss prediction models under multiple operating conditions, (2) aerodynamic design and flow mechanism of power turbines for marine gas turbines, (3) aerodynamics of variable speed power turbines for turboshaft/turboprop engines, and (4) other issues about power turbines for marine and turboshaft/turboprop engines. The emphasis is placed on the aerodynamic design and flow mechanism of marine and aviation power turbines. We also present our own insights regarding the current research trends and the prospects for future developments.

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“…For instance, rotating vortex ropes and vanless space vortex structures [1-5] threaten the safe operation of hydraulic turbines. And large relative variations in head [6], free surface vortices or upstream and downstream water level fluctuations [7,8] compromise the operation of marine and runof-river turbines. In order to minimize the risks of these phenomena, it is of paramount importance to determine the modal responses, i.e., the natural frequencies, mode shapes, and damping ratios, of the machines.…”

Section: Introductionmentioning

confidence: 99%

On the Added Modal Coefficients of a Rotating Submerged Cylinder Induced by a Whirling Motion—Part 1: Experimental Investigation

Roig,

Sánchez-Botello,

Jou

et al. 2023

JMSE

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The operation of submerged rotating machines, such as marine current or tidal turbines, can present deleterious fluid phenomena that may provoke extreme structural vibrations. To predict their dynamic responses, it is necessary to know the added modal coefficients of their runners under a whirling motion. For that purpose, a bespoke test rig was designed to investigate the added modal coefficients of a submerged cylinder, which could rotate at different speeds both in air and completely submerged in water inside a cylindrical tank. First, the modes of vibration were experimentally measured by exciting the cylinder with a push-release method during steady tests or with ramps in rotating speed during transient tests. The calculated natural frequencies and damping ratios were then used in a mathematical model of the dynamic system to calculate the added modal coefficients. During steady tests, the natural frequencies and damping ratios of the whirling modes changed significantly as a function of the rotating speed. Additionally, a whirling mode was observed to change its direction at a given rotating speed. During transient tests, rotating speed ramps with high accelerations were found to present lower lock-in amplitude and frequencies. Moreover, fast downward ramps presented lock-in amplitudes four times higher than fast upward ramps. Consequently, the added modal coefficients changed accordingly as a function of the rotating speed, ramp acceleration, and ramp direction. For these reasons, it was confirmed that the modal responses of submerged rotating bodies must be calculated for each operational rotating speed, even at low velocities, and for each transient event in order to precisely predict their vibration behaviors.

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Performance prediction of a prototype tidal power turbine by using a suitable numerical model

Cited by 32 publications

References 27 publications

Refined hydro-environmental modelling for tidal energy generation: West Somerset Lagoon case study

Refined hydro-environmental modelling for tidal energy generation: West Somerset Lagoon case study

Advances in aerodynamics of power turbines for marine and aviation applications

On the Added Modal Coefficients of a Rotating Submerged Cylinder Induced by a Whirling Motion—Part 1: Experimental Investigation

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