Drag Reduction Technology of Jet - A Review

Gu, Yun Qing; Fan, Tian Xing; Mou, Jie Gang; Deng, Wangqun; Zheng, Shui Hua; Jiang, Lan

doi:10.4028/www.scientific.net/jera.17.30

Cited by 3 publications

(3 citation statements)

References 50 publications

(48 reference statements)

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“…After the mixed medium enters the impeller, its flow direction changes from axial to peripheral with the rotation of the blades, and as a result, it is separated at the leading edge of the blade. Because the gas-liquid mixed medium of the mixed pump is a fluid with high Reynolds number, the resistance is mainly caused the frictional stress of the mixed medium on the wall, that is the shear stress on the wall by the viscosity of the medium and the Reynolds stress in the turbulent state (Gu et al 2015;Wu et al 2014). The expression is as follows:…”

Section: Resistance Characteristic Analysismentioning

confidence: 99%

Influence of Bionic Waveform Leading Edge Blade on Drag Reduction Characteristics of Mixed Pump

2023

JAFM

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Because the helical axial flow gas-liquid mixing pump has the great advantage of conveying gas-liquid two-phase mixed medium, it has become the main core equipment for deep-sea oil and natural gas exploitation. The gas phase aggregation and bubble movement trajectory in the impeller channel have been widely studied, but the increase of medium flow resistance caused by flow separation has not been deeply discussed. Combined with the Euler multiphase flow model and the SST k-ω turbulence model, the numerical calculation of the helical axial flow gas-liquid mixed pump is carried out. Under design flow conditions Q = 100 m3/h, head H = 30 m, speed n = 4500 r/min, specific speed ns =213.6 r/min, and under different inlet gas content conditions, the influence of the bionic waveform leading edge blade on drag reduction characteristics of the helical axial flow gas-liquid mixed pump was investigated. By designing the blade with a leading-edge structure with different heights and pitches, the separation of the mixed medium and the suction surface is effectively suppressed, and the flow resistance of the medium in the 1/10 area of the inlet end of the blade is reduced. The results show that when the height A is 0.25%L and the pitch λ is 12.5%h, the maximum drag reduction rate in this region is 52.6%, the maximum increase in efficiency of the mixed pump is 2.2%, and the maximum increase in head is 4.8%. This study can provide technical support for flow drag reduction in gas-liquid mixed pump.

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Section: Resistance Characteristic Analysismentioning

confidence: 99%

Influence of Bionic Waveform Leading Edge Blade on Drag Reduction Characteristics of Mixed Pump

2023

JAFM

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“…It reduces the air resistance from the aircraft and lowers heat flux, and involves shock wave, expansion wave, shear wave, and eddy current with the interactions between them. [153][154][155] Eugene S. Love et al 156 introduced a jet in the supersonic regime. It was noted that the counter-flow jet operates well in the supersonic regime as compared to subsonic.…”

Section: Counter-flow Jetsmentioning

confidence: 99%

Review of wave drag reduction techniques: Advances in active, passive, and hybrid flow control

Rashid

Nawaz

Maqsood

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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Typical challenges of supersonic flight include wave drag, acoustic signature, and aerodynamic heating due to the formation of shock waves ahead of the vehicle. Efforts in the form of sleek aerodynamic designs, better propulsion systems, and the implementation of passive and active techniques are generally adopted to achieve a weaker shock wave system. Shock reduction can improve flight range, reduce fuel consumption, and provide thermal protection of the forebody region. This paper briefly reviews shock reduction techniques, including passive, active, and hybrid flow control. Airfoil shape optimization, mechanical spike, and forebody cavities are studied as passive flow control approaches. For active flow control, developments in the area of opposing jets and energy deposition are explored. The combination of active and passive flow control and the hybrid flow techniques are discussed in the end. The discussions include the principle of operation, physics of fluid behavior, and overall contribution to flight stability characteristics. The implications in the usage of these technologies, along with potential gaps, are also identified. This comprehensive review can serve as the basis for contemporary solutions to realize sustainable supersonic travel for the aviation industry.

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“…2 [38] . Sharkskin swimsuit is a kind high-tech swimsuit which imitates shark skin and also plays a huge role in breaking the world records [39,40] ; in soil environment, soil animals show a high degree of unity organisms with their environment and form anti-adhesion drag reduction features [41][42][43] ; the shape or structure of dolphin skin is applied in submarine design and antifouling coating is also created [44] ; and for the bionic jet surface drag reduction method based on the shark gill cleft jet effect, can effectively reduce its surface friction resistance from water, drag reduction effect is obvious, green, environmental protection [45][46][47][48][49][50] . In the architecture field, termite can building mound by using adhesive, and also can spray adhesive to the enemy through a head tube.…”

Section: Enlightenment From Bionicsmentioning

confidence: 99%

Advances in Researches on Bionics

Fan

Mou

et al. 2015

JBBBE

Self Cite

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Bionics is a new frontier science and provides many inspiration and thoughts for human invention. Through discussing the classification of bionics, it can greatly improve the capacity of human’s adaptation for nature and productivity as well. It can also have great social and economic benefits. Besides, the reason that restricts bionics development is expounded. Development of bionics can’t last long without the cooperation with many other subjects, and its own development also promotes the development of these disciplines. Furthermore, it is development trend of bionic that to achieve more perfect imitation and reengineering of nature, to discover and develop its relevant theories and technical methods. Therefore, bionics plays more and more important role in innovation and has broad prospects in the research.

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Drag Reduction Technology of Jet - A Review

Cited by 3 publications

References 50 publications

Influence of Bionic Waveform Leading Edge Blade on Drag Reduction Characteristics of Mixed Pump

Influence of Bionic Waveform Leading Edge Blade on Drag Reduction Characteristics of Mixed Pump

Review of wave drag reduction techniques: Advances in active, passive, and hybrid flow control

Advances in Researches on Bionics

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