Active Flow Control over a NACA23012 Airfoil using Hybrid Jet

Singh, Deepak Kumar; Jain, Anuj; Paul, Akshoy Ranjan

doi:10.14429/dsj.71.16468

Cited by 10 publications

(5 citation statements)

References 9 publications

(12 reference statements)

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“…In terms of aerodynamic improvement, the unsteady jet devices can perform equally well or, in some cases, present superior control performance when compared to the steady jet, with the advantage of requiring a reduced mass blowing rate from the system. Recent studies, which also combine continuous and oscillatory jets as carried out by Seifert et al (1993), were performed by Singh et al (2021). Instead of supplying the hybrid jet to the flap region, the research was based on the jet application to the leading edge (12% c), where a significant stall delay was observed, changing the angle of stall from 16° to 20° when the mean velocity of the hybrid jet was equal to the free stream.…”

Section: Active Flow Controlmentioning

confidence: 99%

Numerical Study of Flow Control on Simplified High-Lift Configurations

2023

JAFM

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Enhancement in the aerodynamic performance of wings and airfoils is very notable when Active Flow Control (AFC) is applied to Short Take-off and Landing aircraft (STOL). The present numerical study shows the application of steady, pulsed and synthetic tangential jets applied to the plain flap shoulder of a modified NASA Trapezoidal Wing. Pulsed jets are modeled by sinusoidal and square waveforms while synthetic jets are modeled only by pure sine waveform. The freestream airflow conditions are Mach number equal to 0.2 and Reynolds number equal to 4.3 million based on the mean aerodynamic chord. The presented simulations are two-dimensional and based on RANS for steady jet cases and URANS for pulsed and synthetic cases, compiled with the open-source suite SU2 and adapted for time varying boundary conditions. Numerical results for modified configurations based on the same baseline wing profile considering different leading edges, jet slot height, flap position, blowing mass flow, type and frequency of the jets are presented. Curves of pressure coefficient distribution revealed a substantial influence upstream of the AFC, around the slat and main element. The jet slot height analysis showed that the lift gain is also influenced by the slot size due to the change of the local flow velocity considering the same blowing momentum coefficient. Regarding the jet frequency, no significant differences on the lift coefficients were found between the reduced frequencies F+ equal to 1 and 2. Results of aerodynamic loads showed an improved lift coefficient in relation to the baseline airfoil when pulsed and steady jets are employed. Pulsed jets under square waveform were effective even at high deflected flap condition at 50°, with a significant gain in the lift coefficient of 36%, in relation to the uncontrolled case, combined with a drag reduction of 20%, and a decrease in mass flow up to 49% in relation to the steady jet for the same lift gain. Although sine and square waveform results presented similar improvements for lift, the drag is around 15% higher for the former. When compared with the steady jet case, the mass flow reduction is 36% for the sinewave. Synthetic jets with zero-net-mass-flux proved superior to the baseline conventional multi-element airfoil only with deployed flap at 50°, where a modest lift improvement of 5% was observed.

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Section: Active Flow Controlmentioning

confidence: 99%

Numerical Study of Flow Control on Simplified High-Lift Configurations

2023

JAFM

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“…The study revealed that the synthetic jet is an effective method of removing hot spots in many engineering and industrial applications, i.e., processors and electronic chips. Other engineering applications of hybrid jet (combinations of synthetic and continuous jet) is also discussed in Singh et al (2021).…”

Section: Introductionmentioning

confidence: 99%

Cooling enhancement for engine parts using jet impingement

Nasif,

Shinneeb,

Balachandar

2024

Front. Mech. Eng.

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A computational study has been performed to evaluate the use of jet impingement for cooling applications in the automotive industry. The current study uses an entire internal combustion engine cylinder with its components as a computational domain. An unsteady numerical solution for the Navier-Stokes equations was carried out using Improved Delayed Detached Eddy Simulation (IDDES). The volume of fluid approach is proposed to track and locate the liquid jet surface that is in contact with the air. The conjugate heat transfer approach is used to link the heat transfer solution between the fluid and the solid. The boundary conditions that are employed in the study are provided from lab experiments and one-dimensional simulations. The cooling jet in this study targets the hottest region in the piston, i.e., the region underneath the exhaust valve. Three nozzle sizes with flows at different Reynolds numbers are chosen to examine the thermal characteristics of the cooling jet. The computational study reveals that for a specific Reynolds number, the smaller diameter nozzle provides the highest heat transfer coefficient around the impingement point. The maximum relative velocity location at the impingement point slightly leads the location of the maximum Nusselt number. The maximum temperature in the piston decreases by 7% to 11% as the nozzle diameter changes from 1.0 to 3.0 mm for a jet Reynolds number of 4,500. If a correct selection is made for the nozzle size, the cooling jet can be efficiently used to reduce the temperature and alleviate the thermal stresses in the piston in the region underneath the exhaust valve where the maximum temperature occurs.

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“…Among various active flow control techniques, the synthetic jet presents a novel and innovative approach due to some of its features. Simple evaluation studies of synthetic jets without any application in jet engines have been reported by Smith and Glezer [33], Seifert and Pack [34], McCormick [35], Glezer and Amitay [36], Rediniotis et al [37], Smith and Swift [38], Mathis et al [39][40], You and Moin [41], Aram and Mittal 42-43], Mohseni and Mittal [44], Singh et al [45]. The synthetic jet was used for a plethora of applications by the researchers, namely, Smith and Glezer [33] for thrust vectoring, Utturkar et al [46][47], Gallas et al [48] for heat transfer enhancement, Zhang et al [49], Kim and Kim [50], and Lin et al [51] for turbomachinery, and Yadav et al [52][53] for flow control in air-intake ducts.…”

Section: Introductionmentioning

confidence: 99%

Effects of Synthetic Jets on Swirl Inflow in a Variable- Geometry Twin Air-Intake

Yadav

Paul

Jain

et al. 2023

Preprint

Self Cite

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Air intakes are an integral part of contemporary passenger and military aircraft engines. Their impact on aerodynamic performance across the entire flight envelope is critical to aircraft flight safety, efficiency, and maneuverability, especially at high Mach numbers due to shock waves. The high demand for reduction in aircraft weight and size and enhancement of durability, comfort, and thermal and radar signatures compels researchers and engineers to explore new designs and develop efficient air intakes for high-performance aircraft engines. Although a number of studies on air intake have been conducted and reported in the open literature, there is little information available in the public domain on bifurcated twin air intakes using synthetic jet. As a result, the primary goal of this research is to use high-fidelity computational fluid dynamics modelling to investigate the effects of synthetic jets on swirl inflow variable geometry twin air intake aerodynamic performance over a range of Reynolds numbers. Some important parameters (distortion coefficient, non-uniformity index, swirl coefficient, and static and total pressure coefficients) were investigated. Both static and total pressure recovery have been increased at all swirl numbers. A significant decrease in distortion coefficient and swirl coefficient has also been achieved, reaching 67% in both cases. The reduction in the non-uniformity index is achieved by 62% for the controlled flow case. The findings show that the synthetic jets are effective in controlling the flow separation in the twin air-intakes and enhancing aerodynamic performance.

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Active Flow Control over a NACA23012 Airfoil using Hybrid Jet

Cited by 10 publications

References 9 publications

Numerical Study of Flow Control on Simplified High-Lift Configurations

Numerical Study of Flow Control on Simplified High-Lift Configurations

Cooling enhancement for engine parts using jet impingement

Effects of Synthetic Jets on Swirl Inflow in a Variable- Geometry Twin Air-Intake

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