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Pressure Improvement on a Supercritical High-Lift Wing Using Simple and Modulated Pulse Jet Vortex Generator

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Abstract

In this paper, an experimental study, aimed at delaying flow separation on a high-lift device using a pulsed blowing excitation method, is reported. The main objective of this investigation was to evaluate a new pulsed jet generation strategy to enhance flow control performance. In these experiments, two types of signal waveform were implemented to produce the unsteady blowing; a simple square-wave excitation signal for the first case, and a burst modulated excitation signal for the second case. The signal modulation was the first time to be used for a fast-switching solenoid valve actuator. Another objective of this study was to evaluate a new arrangement of the jet exit slots, in the form of a vortex generator which was employed for the first time on the high-lift device. For this purpose, a NASA SC(2)-0714 airfoil with a single slotted flap was employed. The vortex generator jets emanated from the shoulder of the trailing-edge flap with excitation frequencies from 40 to 1000 Hz. Pressure distribution around the model and wake total pressure deficit were measured. The results indicated that ejection from vortex generator slot pairs was able to prevent flow separation completely in most conditions. These measurements revealed that the burst modulated excitation signal was accompanied by more aerodynamic improvements and less air consumption relative to the simple pulsed jet excitation signal. In the best flow control mode, the results showed about a 53% increase in the value of the suction pressure peak on the flap and a 38% decrease in drag with a reduction in total pressure loss.

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Abbreviations

A :

Exit area of the slot pair (m2)

C ref. :

Clean cruise chord length (m)

C flap :

Flap chord length (m)

C p :

Pressure coefficient

C μ :

Excitation momentum coefficient

DC:

Duty cycle

f :

Excitation frequency (Hz)

f m :

Modulating frequency (Hz)

f c :

Carrier frequency (Hz)

F + :

Nondimensional frequency, F+ = f Lf/V

F m + :

Nondimensional modulating frequency, F+ = fm Lf/V

F c + :

Nondimensional carrier frequency, F+ = fc Lf/V

k :

Number of active actuators or number of slot pairs

L :

Length scale of the flow domain (m)

L f :

Length of flap chord (m)

l :

Length of actuator slot (m)

MPJ:

Modulated pulse jet

N:

Number of hot-wire samples in each position

\(q\) :

Dynamic pressure (\(q=\frac{1}{2}\rho {V}^{2}\))

\(\dot{q}\) :

Volume flow rate (m3/s)

S :

Planform area of flap (m2)

SPJ:

Simple pulsed jet

U i :

Instantaneous velocity (m/s)

U c :

Mean centerline velocity of the jet (m/s)

U exit :

Mean centerline velocity at the jet exit (m/s)

u rms :

RMS of jet centerline velocity fluctuations (m/s)

V :

Freestream velocity (m/s)

w :

Length of the wake rake (m)

x/D :

Nondimensional downstream centerline distance from jet exit

x/c flap :

Nondimensional length of flap chord

x/c ref. :

Nondimensional length of the model chord

α :

Angle of attack (°)

∆P Total :

Total pressure loss (pa)

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Authors and Affiliations

  1. Aerospace Research Institute, Ministry of Science, Research and Technology, Mahestan St., Shahrak-e-Gharb, P.O.Box: 14665-834, Tehran, Iran

    Soheila Abdolahipour & Arash Shams Taleghani

  2. Department of Aerospace Engineering, Amirkabir University of Technology, No. 350, Hafez Ave, Valiasr Square, 1591634311, Tehran, Iran

    Mahmoud Mani

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  1. Soheila Abdolahipour
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  2. Mahmoud Mani
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  3. Arash Shams Taleghani
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Correspondence to Arash Shams Taleghani.

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Abdolahipour, S., Mani, M. & Shams Taleghani, A. Pressure Improvement on a Supercritical High-Lift Wing Using Simple and Modulated Pulse Jet Vortex Generator. Flow Turbulence Combust 109, 65–100 (2022). https://doi.org/10.1007/s10494-022-00327-9

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