Performance Enhancement of Auxiliary Air Intakes Using Vortex Generators

Purpose The purpose of this paper is to enhance the heat transfer and thermal performance in the trailing edge region of the vane with vortex generators (VGs). Design/methodology/approach This numerical study presents the enhancement of thermal performance in the trailing part of a gas turbine blade. In the trailing part, generally, pin fins are used either in staggered or in-line arrangements to enhance the heat transfer. In this study, based on the idea from heat exchangers, pin fins are combined with VGs. A pair of VGs is embedded in the boundary layer upstream of each pin fin in the first row of the pin fin array having an in-line configuration. The effects of the VG angle relative to the streamwise direction and streamwise distance between the pin fin and VGs are investigated at various Reynolds numbers. Findings The results indicated that the endwall heat transfer is enhanced with the addition of VGs and the heat transfer from the surfaces of the pin fins. The level of heat transfer enhancement compared to the case without VGs is more significant at high Reynolds number. The surfaces of the VGs also show a significant amount of heat transfer. Study of the angle of the attack suggested that a high angle of attack is more appropriate for pin fin cooling enhancement whereas an intermediate gap between the VGs and pin fins shows considerable improvement of thermal performance compared to the small and large gaps. The phenomenon of heat transfer augmentation with the VGs is demonstrated by the flow field. It shows that the enhancement of heat transfer is governed by the mixing of the flow as a result of the interaction of vortices generated by the VGs and pin fins. Originality/value VGs are used to disturb the thermal boundary layer. It shows that heat transfer is augmented as a result of the interaction of vortices associated with VGs and pin fins.

Download Full-text

Lift Enhancement of NACA 4415 Airfoil using Biomimetic Shark Skin Vortex Generator

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.d9222.118419 ◽

2019 ◽

Vol 8 (4) ◽

pp. 9231-9234

Keyword(s):

Performance Enhancement ◽

Incident Angle ◽

Vortex Generator ◽

Leading Edge ◽

Vortex Generators ◽

Shark Skin ◽

Baseline Case ◽

Lift And Drag ◽

Drag Ratio ◽

Lift To Drag Ratio

An experimental study was conducted to investigate the aerodynamic performance of the NACA 4415 airfoil with and without passive vortex generators. The measurement has been carried out for three considered cases: smooth airfoil for baseline case, airfoil with triangular vortex generator and also airfoil with shark skin shape vortex generator. Both the triangular and shark skin vortex generators were located at 50% of chord from leading edge of the airfoil with a 20° counter-rotating incident angle. The experiments were conducted with Reynold’s number of 100,000. Overall, the results indicate that the lift and drag coefficients, and lift-to-drag ratio, for the airfoil with sharkskin vortex generator are comparatively higher than the other airfoils at some angles of attack. The findings can be applied in optimizing shark skin shape vortex generator for the airfoil performance enhancement.

Download Full-text

Thermal performance enhancement in cross flow by vortex generators: A Review

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/402/1/012161 ◽

2018 ◽

Vol 402 ◽

pp. 012161 ◽

Cited By ~ 1

Author(s):

Chidanand K Mangrulkar ◽

A S Dhoble ◽

T M Sathe ◽

S S Joshi

Keyword(s):

Thermal Performance ◽

Performance Enhancement ◽

Cross Flow ◽

Vortex Generators

Download Full-text

An Analysis of a Duct with Different Vortex Generators for Performance Enhancement of a Solar Air Heater: Computational Fluid Dynamics (CFD)

Lecture Notes in Mechanical Engineering - Advances in Fluid and Thermal Engineering ◽

10.1007/978-981-13-6416-7_59 ◽

2019 ◽

pp. 637-645

Author(s):

Noel Vinsent Chand ◽

Vineet Kumar ◽

Anuj Kumar Sehgal

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Performance Enhancement ◽

Vortex Generators ◽

Solar Air Heater ◽

Air Heater ◽

Computational Fluid Dynamics Cfd

Download Full-text

Performance enhancement of a louvered fin heat exchanger by using delta winglet vortex generators

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2012.09.004 ◽

2013 ◽

Vol 56 (1-2) ◽

pp. 475-487 ◽

Cited By ~ 53

Author(s):

Henk Huisseune ◽

Christophe T’Joen ◽

Peter De Jaeger ◽

Bernd Ameel ◽

Sven De Schampheleire ◽

...

Keyword(s):

Heat Exchanger ◽

Performance Enhancement ◽

Vortex Generators ◽

Louvered Fin ◽

Delta Winglet

Download Full-text

Aerodynamic Performance Enhancement of Tiltrotor Aircraft Wings Using Double-Row Vortex Generators

International Journal of Aeronautical and Space Sciences ◽

10.1007/s42405-020-00346-8 ◽

2021 ◽

Author(s):

Hao Chen ◽

Bo Chen

Keyword(s):

Performance Enhancement ◽

Aerodynamic Performance ◽

Vortex Generators ◽

Double Row ◽

Aircraft Wings ◽

Tiltrotor Aircraft

Download Full-text

High-Lift Devices Performance Enhancement Using Mechanical and Air-Jet Vortex Generators

Journal of Aircraft ◽

10.2514/1.36836 ◽

2008 ◽

Vol 45 (6) ◽

pp. 2049-2061 ◽

Cited By ~ 19

Author(s):

M. Meunier ◽

V. Brunet

Keyword(s):

Performance Enhancement ◽

Vortex Generators ◽

High Lift ◽

Air Jet

Download Full-text

Aerodynamic performance enhancement of an Airfoil using trapezoidal vortex generators

Aircraft Engineering and Aerospace Technology ◽

10.1108/aeat-01-2020-0021 ◽

2020 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Rawad Himo ◽

Charbel Bou-Mosleh ◽

Charbel Habchi

Keyword(s):

Performance Enhancement ◽

Numerical Study ◽

Fluid Dynamic ◽

Three Dimensional ◽

Vortex Generator ◽

Vortex Generators ◽

Dynamic Simulations ◽

Content Type ◽

Inclination Angles ◽

Drag Ratio

Purpose Flow separation on wings, blades and vehicles can be delayed or even suppressed by the use of vortex generators (VG). Numerous studies, documented in the literature, extensively describe the performance of triangular and rectangular VG winglets. This paper aims to focus on the use of non-conventional VG shapes, more specifically an array of trapezoildal-perforated VG tabs. Design/methodology/approach In this study, computational fluid dynamic simulations are performed on an inline array of trapezoidal VG with various dimensions and inclination angles, in addition to considering perforations in the VG centers. The methodology of the present numerical study is validated with experimental data from the literature. Findings The performance and the associated flow structures of these tested non-conventional VG are compared to classical triangular winglets. For the proposed non-conventional trapezoidal VG, at the onset of stall, a 21% increase of lift over drag on the airfoil is observed. The trapezoidal VG enhancement is also witnessed during stall where the lift over drag ratio is increased by 120% for the airfoil and by 10% with respect to the triangular winglets documented in the literature. Originality/value The originality of this paper is the use of non-conventional vortex generator shape to enhance lift over drag coefficient using three-dimensional numerical simulations.

Download Full-text