Flow separation control on a highly loaded compressor cascade using endwall synthetic jets

Qin, Yong; Song, Yanping; Wang, Ruoyu; Liu, Huaping; Chen, Fu

doi:10.1177/0954410017717546

Cited by 4 publications

(2 citation statements)

References 29 publications

(50 reference statements)

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“…Seifert et al [15] applied the jet actuator to an aerofoil, and the aerodynamic performance of the aerofoil was improved obviously. Qin et al [16] used end wall SJ to control the flow separation of stator cascade of high-load compressor. The results showed that the end wall SJ can significantly improve the flow in the blade channel.…”

Section: Introductionmentioning

confidence: 99%

Effect of synthetic jet parameters on flow control of an aerofoil at high Reynolds number

et al. 2019

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In this work, flow separation control has been conducted for the S809 aerofoil at a high Reynolds number using synthetic jet technology. The aerodynamic characteristics of the aerofoil have been compared in detail at different angles of attack, for the cases with and without adoption of synthetic jet. Numerical methods are employed for predicting flow structure and performance of the aerofoil. In addition, main parameters of the synthetic jet are optimized by the orthogonal experimental design, and dual jets are also employed for the comparison to a single jet. The results show that the flow separation at large angles of attack can be eliminated or greatly reduced by the synthetic jet, due to the mixing of low-energy fluid in boundary layer with high-energy fluid produced by the synthetic jet. The lift-to-drag ratio has been considerably increased by the synthetic jet for the critical condition, deep stall condition and complete stall condition as well. The maximum jet velocity of the synthetic jet is found to have the biggest effect on flow separation control. Furthermore, compared with single synthetic jet, the dual jets can make much better improvement on flow separation control of the aerofoil, especially at the complete stall condition.

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Section: Introductionmentioning

confidence: 99%

Effect of synthetic jet parameters on flow control of an aerofoil at high Reynolds number

et al. 2019

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“…Thus, the flow separation was improved, and 21.63% reduction of the losses was achieved. 15 The magnitude of the mass flow rate of the tip-jets is larger than that of the jets used for flow control. The tip-jets flow phenomenon of expansion, dissipation, and entrainment is developed inside the ducted fan.…”

Section: Introductionmentioning

confidence: 99%

Effects of tip-jet on the performance of a ducted fan

Huang

Chen

2019

Proceedings of the Institution of Mechanical Engineers, Part G:

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Tip-jet technology has potential value for application in vertical take-off and landing or short take-off and landing concept aircraft. The main objective of this current work is to investigate the effects of the tip-jet on the performance of a ducted fan in hover. The overall flow field of the ducted fans with tip-jet was simulated by using the shear-stress transport k-omega turbulence model with a refined high-quality structured grid at various rotational speeds. The comparative analysis of the performances of the ducted fans with different tip-jet locations was carried out. The results indicate that the circulation of the blade with tip-jet is affected by the flow blockage, Coanda effect, and edge-shed vortex. These flow features were formed by the tip-jet. The fan’s thrust could be augmented when the nozzle was a little farther from the blade trailing edge. However, a higher jet flow utility efficiency could be achieved when the nozzle was close to the blade trailing edge.

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Investigation of vortex motion mechanism of synthetic jet in a cross flow

et al. 2022

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To investigate the mechanism of vortex motion, a pitched synthetic jet is arranged on the bottom of a cross flow and simulated by incompressible Naiver–Stokes equations with large eddy simulation. The Liutex vector identification method is utilized to quantitatively study the rotation strength and the core size of the vortex structures according to various driving frequencies ( St = 0.25, 0.5, 0.75, 1.0) and amplitudes ( A0 = 1.0, 1.5, 2.0, 2.5) of the synthetic jet during 21 periods. The results show that both the frequency and the amplitude play a significant role in the vortex generation mechanism of the synthetic jet. However, the amplitude makes a positive contribution to the rotation strength and the vortex core size, while the frequency makes a negative contribution. The vortex motion mechanism of a synthetic jet in a cross flow can be summarized as follows: low frequency and small amplitude favor the primary clockwise vortex, while high frequency and large amplitude motivate the anticlockwise vortex generation.

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Flow separation control on a highly loaded compressor cascade using endwall synthetic jets

Cited by 4 publications

References 29 publications

Effect of synthetic jet parameters on flow control of an aerofoil at high Reynolds number

Effect of synthetic jet parameters on flow control of an aerofoil at high Reynolds number

Effects of tip-jet on the performance of a ducted fan

Investigation of vortex motion mechanism of synthetic jet in a cross flow

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