Vortex dynamics mechanisms of separated boundary layer in a highly loaded low pressure turbine cascade

Sajadmanesh, Seyed Morteza; Mohseni, Arman; Mojaddam, Mohammad

doi:10.1016/j.ijheatfluidflow.2020.108540

Cited by 11 publications

(3 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In which A i,j and A i,j were the elements of the A and A matrices, respectively [28,29]. On the condition of a diffusion angle of α = 12 • , the vectoring jet attaching to the wall is stable.…”

Section: Dynamic Mode Decompositionmentioning

confidence: 99%

“…This method has been widely used in the study of various unsteady flows, and derived the forms of optimal (opt−DMD) [26], optimal mode decomposition (OMD), and sparse improved DMD (SPDMD) [27], which has gradually became a new tool for hydrodynamics mechanism analysis. Using POD and DMD techniques, Sajadmanesh et al [28,29] successfully identified separated bubbles in ultra−high lift turbine cascades and the flapping phenomenon in highly loaded low−pressure turbine cascades.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Investigation on Jet Vector Deflection Jumping Phenomenon of Coanda Effect Nozzle

Chi

2022

Applied Sciences

View full text Add to dashboard Cite

The Coanda effect nozzle is a fluid thrust vectoring technology that uses the Coanda effect to control jet vector deflection. The jumping phenomenon often occurs in the process of controlling jet vector deflection. This phenomenon leads to the nonlinearity of thrust vector control. It destroys the control performance of the aircraft and brings potential dangers to the safety of the aircraft. The jumping phenomenon occurs in an unsteady flow field different from the traditional flow phenomenon. The flow structure in an unsteady flow field changes with time, so it is not easy to control by the traditional active flow control method. This paper explains the reasons for the jumping phenomenon from two aspects: flow field stability and flow structure. Secondly, the unsteady flow field with the jumping phenomenon is studied and analyzed by a flow visualization experiment and dynamic force measurement. Furthermore, the dynamic modal decomposition (DMD) method is used to extract the characteristic frequencies of the critical vortices causing jets to jump in unsteady flow fields. Finally, a pulsed jet with the same characteristic frequency is used to control the varying vortices in the unsteady flow field. The experimental results show that the active flow control method, which extracts the characteristic frequency of the critical flow field structure by DMD, effectively suppresses the jumping phenomenon in the unsteady flow field. It also linearizes the process of jet nonlinear vector deflection.

show abstract

Section: Dynamic Mode Decompositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Jet Vector Deflection Jumping Phenomenon of Coanda Effect Nozzle

Chi

2022

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…They concluded that the wake becomes narrow and smaller by raising Darcy number due to the flow separation on the body occurs later. Sajadmanesh et al [12] numerically examined the separation bubbles over ultra-high-lift LPT blades by using LES.…”

mentioning

confidence: 99%

DNS of secondary flows over oscillating low-pressure turbine using spectral/hp element method

Nakhchi

Naung

Rahmati

2020

International Journal of Heat and Fluid Flow

View full text Add to dashboard Cite

Effects of Heat Transfer on Laminar-to-Turbulent Transition over a Compressor Blade Operating at Low Reynolds Number

Lu,

Wang,

Zhang

et al. 2024

J. Therm. Sci.

View full text Add to dashboard Cite

Vortex dynamics mechanisms of separated boundary layer in a highly loaded low pressure turbine cascade

Cited by 11 publications

References 40 publications

Experimental Investigation on Jet Vector Deflection Jumping Phenomenon of Coanda Effect Nozzle

Experimental Investigation on Jet Vector Deflection Jumping Phenomenon of Coanda Effect Nozzle

DNS of secondary flows over oscillating low-pressure turbine using spectral/hp element method

Effects of Heat Transfer on Laminar-to-Turbulent Transition over a Compressor Blade Operating at Low Reynolds Number

Contact Info

Product

Resources

About