Research on drag reduction performance of turbulent boundary layer on bionic jet surface

Li, Fang; Zhao, Gang; Liu, Weixin

doi:10.1177/1475090216642463

Cited by 6 publications

(5 citation statements)

References 25 publications

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“…[ 182 ] Li et al gauged the friction force between the jet surface and the fluid on the fluid friction test platform and displayed the collected data with a digital dynamometer. [ 183 ]…”

Section: Experimental Methods For Measuring Drag Reductionmentioning

confidence: 99%

Focus on Bioinspired Textured Surfaces toward Fluid Drag Reduction: Recent Progresses and Challenges

et al. 2021

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After a long period of biological evolution, natural creatures will inevitably evolve body surfaces suitable for the living environment. The functions of natural biological surfaces are abundant and powerful, including antiadhesion, self‐cleaning, drag reduction, anti‐icing, wear resistance, and other characteristics. In the context of coping with the energy crisis, inspired by natural biological surface microstructures, researchers explore biomimetic surface microstructures that reduce fluid drag and investigate the mechanisms of drag reduction. Herein, mainly the current state of research on biomimetic textured surfaces that can be applied to fluid drag reduction is reviewed and the microstructures’ morphology, drag reduction mechanisms, and the fabrication techniques of textured surfaces are discussed in detail. In particular, the experimental methods for measuring the drag reduction effect of textured surfaces are introduced, which is extremely rare. The article concludes with a summary of existing problems and future directions in the research of biomimetic surface drag reduction technology. This Review can provide a reference for practical application and laboratory research of drag reduction in marine transportation, military weapons, aviation, and pipeline systems.

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“…[ 182 ] Li et al gauged the friction force between the jet surface and the fluid on the fluid friction test platform and displayed the collected data with a digital dynamometer. [ 183 ]…”

Section: Experimental Methods For Measuring Drag Reductionmentioning

confidence: 99%

Focus on Bioinspired Textured Surfaces toward Fluid Drag Reduction: Recent Progresses and Challenges

et al. 2021

View full text Add to dashboard Cite

show abstract

“…, function value is 0, when x = x i , function on the domain integral is 1, using Dirac function elastic support position in the x direction can be divided into two categories: The first type is the elastic support position d 1 (x) with x = 0 as the starting position and period L; the other type is the elastic support position d 2 (x) with x = l 1 = 1 1 + q L as the starting position and period L:…”

Section: The Governing Equation Of Small Perturbation In the Skinmentioning

confidence: 99%

“…After hundreds of millions of years of natural optimization and selection, the body surface structure of Marine fish evolved and formed many specific structures and excellent drag reduction functions, with extraordinary low resistance and efficient swimming ability. [1][2][3] One of the important inspirations of bionic drag reduction research comes from the study of dolphins. The proposal of the famous Gray's Paradox has triggered a boom of bionic drag reduction research based on dolphin skin.…”

Section: Introductionmentioning

confidence: 99%

Stability and drag reduction in turbulent flow of skin with quasi-periodic elastic supports

Chen

Liu

Zhao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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In order to reduce the flow resistance on the surface of ships, the skin with quasi-periodic elastic supports is designed based on the flexible skin drag reduction technology inspired by dolphin skin. In this paper, the stability characteristic equation of fluid-structure coupling system is established based on small perturbation theory and solved by MATLAB. The results indicate that the skin with quasi-periodic elastic supports has the ability of maintaining stability of turbulent boundary layer when the structural parameters are reasonable. In addition, the drag reduction performance of the skin with quasi-periodic elastic supports is studied by immersion boundary method. The analysis results demonstrate that the skin with quasi-periodic elastic supports can show better drag reduction performance than the skin with periodic elastic supports when the structural parameters q and the support spacing L are rationally set. In a certain speed range, the relative drag reduction rate is up to 72.16%. These optimal distribution parameter data of the skin under certain speed conditions obtained in this paper provide a reference for the practical application and intelligent optimization design of the skin with quasi-periodic elastic supports.

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“…Additionally, the existence of riblets results in the thickening and increase in the viscous bottom layer in the boundary layers, so as to reduce the fluid resistance. In addition, the theories of the air bearing and the vortex cushion effect have also been put forward [3,4,17,[22][23][24][25][26][27][28][29].…”

Section: Fluid Resistance Reduction Technology Of Bionic Non-smooth Smentioning

confidence: 99%

Bionic optimum design of straight cone nozzle and the effectiveness evaluation of reducing fluid resistance

Wen

Chen

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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High-pressure water jet technology is a clean and effective approach to break, cut or clean solid materials. The nozzle's hydraulic performance determines the efficiency and quality of the high-pressure water jet technology implementation. The fluid resistance reduction technology of bionic non-smooth surface is applied to the structural design of the straight cone nozzle successfully. The circular groove is selected as the bionic unit. The selection results in the investigation and development of a bionic straight cone nozzle with the optimum hydraulic performance. Moreover, the separated nozzle machining method is successfully implemented. A comprehensive approach that implements the orthogonal experiment, high-pressure water jets' impact forces testing and range analysis results in the optimization of the bionic straight cone nozzle's structure. The optimal structural parameters of the nozzle as follows: the outlet diameter is 4 mm, length-to-diameter ratio is 2.5, contraction angle is 60°, the circular groove width is 3 mm, the circular groove depth is 2 mm and the circular groove number is 2. In addition, the circular grooves are uniformly arranged on the surface of the straight cone nozzle's internal chamber resulting in reduction of the fluid resistance effectively. Under the same experimental conditions, the impact forces of high-pressure water jets produced by the bionic straight cone nozzles are greater in comparison with the impact forces of high-pressure water jets produced by the ordinary straight cone nozzles. The average rate of fluid resistance reduction of bionic straight cone nozzles is up to 2.33%. Furthermore, the results of CFD numerical simulation show that the circular grooves at the contraction and the outlet sections can also reduce the high-pressure water flow resistance effectively. In the meantime, the opposite rotating vortexes in the circular grooves are the main reason for the reduction in fluid resistance of the bionic straight cone nozzle.

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Research on drag reduction performance of turbulent boundary layer on bionic jet surface

Cited by 6 publications

References 25 publications

Focus on Bioinspired Textured Surfaces toward Fluid Drag Reduction: Recent Progresses and Challenges

Focus on Bioinspired Textured Surfaces toward Fluid Drag Reduction: Recent Progresses and Challenges

Stability and drag reduction in turbulent flow of skin with quasi-periodic elastic supports

Bionic optimum design of straight cone nozzle and the effectiveness evaluation of reducing fluid resistance

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