Numerical Analysis of Impulse Turbine for Isolated Pilot OWC System

Liu, Zhen; Jin, Jiyuan; Cui, Ying; Fan, Haiwen

doi:10.1155/2013/416109

Cited by 8 publications

(6 citation statements)

References 10 publications

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“…The turbine has a rotor composed of 26 blades that have symmetric airfoils, and 26 guide vanes symmetrically mounted upwind and downwind the rotor, respectively. The performance chart was defined for the turbine in Figure 5c, which was drawn using the CFD analysis method described in detail in Reference [16]. The performance chart defines various airflow rate-turbine RPM-pneumatic pressure inter-relationships and yielded discrete values.…”

Section: Alternative Methodsmentioning

confidence: 99%

Effective Method for Evaluating Airflow Rate of Oscillating-Water-Column Pilot Plants

Park¹,

Kim²,

Oh³

et al. 2021

Processes

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In this study, a method for effectively estimating the airflow rate of the turbine of an oscillating water column (OWC) pilot plant was developed. The validity of the proposed method was verified through computational fluid dynamics simulations. The method was applied to estimate the airflow rate in irregular wave states based on the operation data obtained for the Yongsoo OWC pilot plant installed in the western seas of Jeju Island, South Korea. As an alternative to estimating the airflow rate of the OWC pilot plant, the impulse turbine performance chart-based interpolation method is introduced, and it is shown that the airflow rate time series calculated using the two methods were in good agreement.

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Section: Alternative Methodsmentioning

confidence: 99%

Effective Method for Evaluating Airflow Rate of Oscillating-Water-Column Pilot Plants

Park¹,

Kim²,

Oh³

et al. 2021

Processes

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show abstract

“…While CFD simulation models combined with the genetic algorithm have been recently used for a multiple optimization of several parameters at the same time [20], the analysis of every single parameter separately gives another perspective to the optimization problem, closer to the physical point of view. With similar methods, Liu et al [15] determined the influence of the guide vane angle and the tip clearance, therefore we discuss here other relevant design parameters.…”

Section: Analysis Of Design Parametersmentioning

confidence: 99%

“…When analyzing the rotor design one of the most important parameters analyzed is the tip clearance [15,16]. In Figure 1, the yellow cover represents the stator with diameter D s and the radial gap of the stator to the tip diameter of the rotor D t is T. Liu et al [15] used the RNG model to validate reference experimental results and perform further simulations to analyze the tip clearance effect (expressed as 2T D t ). They concluded that the smaller this ratio is, the higher the efficiency is for all flow coefficients.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Influence of Design Parameters on the Efficiency of an OWC Axial Impulse Turbine for Wave Energy Conversion

2019

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Oscillating water column (OWC) axial impulse turbines permit the conversion of wave energy into electrical power. Unlike other hydropower units with a mature and well established technology, such turbines have been recently developed, there are still few prototypes operating and therefore there is a large space for optimizing its design. Many recent studies focus on the improvement of the efficiency and transient characteristics by means of experimentation and also simulation techniques. In the present paper we use a 3D numerical simulation model (computational fluid dynamics model with ANSYS-Fluent 18) to analyze the influence of different geometrical parameters on the efficiency of the turbine, which have been less discussed yet. A reference configuration case has been used to validate our simulation model by comparing it with previous experimental results. Then, parametric variations in the guide vane number and type, gaps between the rotating and stationary part and hub to tip ratio have been introduced in the model to discuss the influence of these effects. It is found that some of these parameters have an important influence on the efficiency of the turbine and therefore, the results presented in this paper can help to optimize future designs of OWC impulse turbines.

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“…For increasing the efficiency of the bi-directional turbines, a series of inventions have been done by researchers based on various optimization approaches [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Major developments include optimized design of aerofoil of rotor blades and development of various types of guide vanes such as self-pitch controlled and active pitch control.…”

Section: Introductionmentioning

confidence: 99%

Oscillating Water Column Wave Energy Converter for Low Wave Height Conditions

Saha

Majumdar

Srikanth

2021

IJRER

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For continuous and uninterrupted energy extraction from marine wave motion, most of the existing wave energy extraction systems employ bi-directional turbines. The aerodynamic loss due to the symmetric placement of guide vanes results in a major power output reduction in the system. To optimize this problem, researchers have developed and tested a variety of oscillating water column air turbines. Most commonly used are the axial turbines because of their simplicity and operational ease. The present work focuses on a novel design of an oscillating water column energy extraction system based on a unidirectional axial impulse turbine with a novel rectifying system arrangement which primarily focuses to minimize the losses due to downstream guide vanes and in turn shoot up the power output for low wave height conditions. A numerical model was developed and investigated using RANS equations and k-ω SST turbulence model. The obtained results portray that the proposed flap-based bi-directional impulse system is operationally viable and produces substantially greater power output in comparison to conventional bi-directional and uni-directional turbine systems under low wave height conditions. A hybrid choking scheme was followed which resulted in additional power output. Results show that full choking of the idle turbine is ensured during the inhalation cycle, which was not possible earlier. During the exhalation cycle, additional power output was also obtained from the secondary turbine i.e., front end turbine during exhalation cycle. The proposed system generates maximum total power output at around a flow coefficient of 1.

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Numerical Analysis of Impulse Turbine for Isolated Pilot OWC System

Cited by 8 publications

References 10 publications

Effective Method for Evaluating Airflow Rate of Oscillating-Water-Column Pilot Plants

Effective Method for Evaluating Airflow Rate of Oscillating-Water-Column Pilot Plants

Numerical Analysis of the Influence of Design Parameters on the Efficiency of an OWC Axial Impulse Turbine for Wave Energy Conversion

Oscillating Water Column Wave Energy Converter for Low Wave Height Conditions

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