Wind pressure distribution on trough concentrator and fluctuating wind pressure characteristics

Zou, Qiong; Li, Zhengnong; Wu, H. R.; Kuang, Rao; Hui, Yi

doi:10.1016/j.solener.2015.02.014

Cited by 23 publications

(12 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because the blockage effect interferes with the flow field around the structure, it is usually required that the blocking rate is not greater than 3%. Based on the existing research conclusions of CFD numerical simulation of solar collector structures, 24,25 the collector position is 5D from the domain inlet (D = 2R is the concentrator aperture diameter); in case that the distance of the structure to the outlet is required to be much greater, the downstream distance is 25D, the windward width of the domain is 10D, and the height of the domain is 6D. The calculation domain settings are shown in Figure 4.…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…The velocity of wind speed with height profile equations is shown as follows where u z , u ref , z ref , z , and n are streamwise velocity component, reference velocity, reference height, elevation and surface roughness index, respectively, The value n was set to be 0.15. According to Zou et al., 25 u ref = 17.2 m/s is the mean wind velocity at z ref = 10 m. The wind speed is a lower value of an international scale of wind force 8 (17.2–20.7 m/s); this value is often considered as the critical wind speed of the dish concentrator during normal operation in China currently.…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…The validation of the numerical model is carried out based on test data from wind-tunnel experiments conducted on a PTS. 25 This reference is used because it provides sufficient parameters about the very similar parabolic geometry and flow conditions to generate an accurate numerical model. The drag coefficient on the collector at 0° yaw angle and pitch angle varying from 0 to 90° is calculated by a PTS numerical model and its load values are compared with the experimental data from the reference.…”

Section: Numerical Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

Numerical simulation of impact on wind load due to mirror gap effect for parabolic dish solar concentrator

Maruyama

Gong

Cai

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

Parabolic dish solar concentrators are currently one of the most efficient solar technologies for the production of electricity. These systems are usually located in an open terrain where strong winds may be found and could affect their stability and optical performance. Mirror gap size has direct relation to thermal efficiency and construction cost. A tiny deformation of the concentrator under the action of a strong wind affects the focusing accuracy and increases the requirement of the structural strength of the dish. In this paper, different gap sizes (0–60 mm) between the mirrors of the dish are studied by numerical simulation. The results show that wind load on concentrator is sensitive to operation position, such as 30° pitch and 60° yaw angle. The gap causes an uneven distribution of the mean pressure coefficient on each facet, thereby increasing the risk of wind-induced vibration at the mirror edge. Besides, the drag coefficient on a parabolic dish increases along with the increase of the gap size between 0 and 60 mm when the dish is at the wind-resistant unfavorable conditions. For the overall wind force on a dish in the state of maximum drag force operation angle case, the mirror gap can reduce the wind force by about 3.54% with the gap size increased, which is mainly due to the significant reduction of the windward area. Therefore, the mirror gap should take as small a size as possible.

show abstract

Section: Numerical Proceduresmentioning

confidence: 99%

Section: Numerical Proceduresmentioning

confidence: 99%

Section: Numerical Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Numerical simulation of impact on wind load due to mirror gap effect for parabolic dish solar concentrator

Maruyama

Gong

Cai

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

show abstract

“…[ 13,14 ] Furthermore, the rougher the terrain, the higher the coherence. [ 20–22 ] Previous studies also report that the spatial coherence of wind pressure is closely related to turbulence structure for tall buildings and long‐span roof structures, [ 23,24 ] and the conical vortex could result in the stronger spatial correlation considering the effect of Reynolds number for the cylindrical roofs. [ 25 ] Subsequently, the focus was on the two‐dimensional spatial correlation, such as the flat roof, cantilevered roof, and spherical roof.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of wind pressure fluctuating characteristics and wind load shape factor of long‐span cylinder roof structure

Wei

et al. 2021

Structural Design Tall Build

View full text Add to dashboard Cite

Summary This paper comprehensively presents the results of a wind tunnel experiment of the wind pressure fluctuating characteristics of a long‐span roof structure, namely the fluctuating wind pressure coefficient (FWPC), wind pressure power spectrum, and wind pressure coherence. The variation trend of FWPCs in the wind directions of 0°, 45°, and 90° were analyzed in sealed and open conditions, as well as the fluctuating wind pressure coefficients of lateral and longitudinal profiles of roof. Subsequently, the models of wind pressure spectrum in different zones and the spatial coherence of fluctuating wind pressure at different wind angles were discussed. The zone values of wind load shape factors of envelope structure with sealed, open, and pile of coal in open were calculated by area weighted averaging. The results indicate that the sealed condition significantly influences the fluctuating characteristics on the roof surface more than the open condition, suggesting that the maximum varied gradient of FWPCs is achieved in the 45° wind direction. Further, different forms and peak frequencies of the wind pressure spectrum in the roof region developed three zones, revealing that the peak frequency in energy‐preserved, inertia, and energy‐dissipated regions show an increasing trend for the different directions. The spatial correlations of wind pressure between measurement taps decrease with the increase in the frequency and spatial distance. Moreover, the correlation coefficients are lower than 0.2 when the frequency was higher than 35 Hz, and a modified three‐dimensional spatial coherence function of wind pressure is proposed. In contrast to the sealed case, the zone values of wind load shape factors of envelope structure with open and pile of coal in open are alleviated due to the separation flows.

show abstract

“…However, the power plants were not managed very well in commercial level, especially in developing countries, due to some demerits of PTC when it is used in practices, such as large wind resistance, apt accumulation of dust and snow, high requirement of tracking precision, as well as huge energy consumption of driving and operation, etc. [2,3]. Fresnel lens was invented by Augustin Jean Fresnel in 1820s and used for beacon [4].…”

Section: Introductionmentioning

confidence: 99%

A Review on Solar Concentrators with Multi-surface and Multi-element Combinations

Zheng

Liu

2019

Journal of Daylighting

View full text Add to dashboard Cite

Solar concentrator always plays an important role in solar energy collection as it could enhance the energy density effectively. Various structures of solar concentrators have been researched in recent years, among which multi-surface (MS) and multi-element (ME) combinations are the two typical structures. MS concentrator is an improved structure for single surface concentrator. It is usually designed to increase the acceptance angle, enhance the light intercepting efficiency, homogenize the energy distribution, etc. ME concentrator is generally consist of two or more optical elements, in which MS concentrators are usually used as assistant optical components. ME concentrator always has larger tolerance on tracking error so that it is much easier to track the sun. It could be applied in high power concentration. The combination on optical elements of MS and ME solar concentrators was diagramed and theirs advantages and disadvantages were evaluated. Nowadays, solar applications are becoming more and more diverse and concomitantly, the researching methods are also improving. The computer-aided methods including numerical computation and optical simulation are the dominant method in nowadays, which makes it easier to analyze various structures of solar concentrators and their complex applications. Besides, solar applications are not limited in CT and CPV, but in many other fields such as solar daylighting, solar-pumped laser, solar cooling, solar desalination etc. It has been believed that more and more innovative designs on solar concentrator will be proposed in the future.

show abstract

Wind pressure distribution on trough concentrator and fluctuating wind pressure characteristics

Cited by 23 publications

References 11 publications

Numerical simulation of impact on wind load due to mirror gap effect for parabolic dish solar concentrator

Numerical simulation of impact on wind load due to mirror gap effect for parabolic dish solar concentrator

Experimental study of wind pressure fluctuating characteristics and wind load shape factor of long‐span cylinder roof structure

A Review on Solar Concentrators with Multi-surface and Multi-element Combinations

Contact Info

Product

Resources

About