Abstract
The problem of suspension treatment of oil and gas pipelines has been highly concerned by engineering construction units and researchers. Research shows that the bionic grass can effectively reduce the flow rate, promote sediment deposition, and control the development of the pipeline suspension area. The velocity distribution of open channel flow with bionic grass is very complex. The height and spacing of bionic grass will affect the flow velocity distribution. At present, the flow velocity in open channels containing bionic grass is mainly studied by measuring the velocity variation in the front, middle, and back of bionic grass, but few effective measurements are made for the full velocity field. This paper describes the use of modern means of an advanced test, using standard particle image velocimetry (PIV) measurements with bionic grass along the water channel to the vertical plane of the distribution of the velocity field. The probability density distribution, spatial correlation of pulsating velocity, turbulence intensity, Reynolds stress, and turbulent kinetic energy in the open channel after the protection section of bionic grass were further analyzed.
Highlights
Bionic grass is based on the principle of marine bionics
It is rare to effectively measure and study the full field velocity of the open channel flow with the bionic grass protection section, but the flow velocity distribution in the channel containing bionic grass is the basis for the further study of the transport law of mud, sand, and matter in the flow
It is obtained that the probability distribution of pulsating velocity is approximately normal in the fully developed free turbulence region, and that is skewed in the strong shear turbulent region near the wall. e turbulence intensity of each vertical line is uniform in the range of relative water depth greater than 0.4, which is approximately linear, reaches the maximum near the bottom of the river, and decreases rapidly to zero at the bottom of the river. e distributions of Reynolds normal stress and shear stress along the vertical line in the nearshore and the center of the river have similar characteristics; there is a certain difference
Summary
Bionic grass is based on the principle of marine bionics. It is processed with a new type of polymer material which is resistant to seawater immersion and long-term erosion [1]. E turbulence characteristics of floodplain flow under the action of different beach plants are discussed: 1 the pulsation of water flow has strong randomness and periodicity; 2 the fluctuating velocity in the longitudinal, transverse, and vertical directions satisfies the normal distribution; 3 the transverse momentum exchange. E structure of the mean flow field and the turbulent flow field is determined by the acoustic Doppler velocity measurement technique, and the results show that the morphology and reconstruction of complex plants have a great influence on shear layer dynamics in some vegetation channels. In order to study the effect of plant morphology on flow structure, Zhang et al [10] carried out laboratory experiments on two kinds of submerged flexible vegetation. The flume experiment was carried out, and the velocity structure behind the bionic grass protection section was measured and studied by using the particle image velocimeter (PIV). e time-averaged velocity distribution, the pulsating velocity probability density distribution, and the pulsating velocity spatial structure of the open channel flow behind the bionic grass protection section under different working conditions were analyzed, and the influence of the existence of bionic grass on the flow velocity structure was quantitatively expounded
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