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"ZOOM" SEMINAR
SCHOOL OF MECHANICAL ENGINEERING SEMINAR
Wednesday, September 16, 2020 at 14:00

Active flow control of Wing-Engine-Slat cut-out flow separation using suction and pulsed blowing

Thesis submitted toward the degree of
Master of Science in Mechanical Engineering
In Tel-Aviv University

by
Shay Monat
Under the supervision of Prof. Avi Seifert

Abstract:
An experimental study on the application of active flow control (AFC) to small- and large-scale wind tunnel test models of a swept wing in a landing configuration was conducted. The swept wing, in landing configuration, was fitted with an Ultra High Bypass Ratio (UHBR) engine nacelle. This highly efficient engine is characterized by a large diameter that strongly interferes with the flow around the wing, causing local boundary layer separation, degrading its performance at high AoA. As a remedy, an innovative active flow control device, creating steady suction and pulsed blowing (PB), was installed at the leading-edge region of the wing, above the nacelle, and its performance was experimentally evaluated. The effects of the suction and the PB mechanisms were examined individually and simultaneously in a small-scale model (1:8.4 scale of the large-scale model), using relevant normalized parameters. The small-scale tests took place in the Knapp-Meadow wind tunnel in Tel-Aviv university and paved the way to the large-scale wind tunnel tests which followed and took place in the T-101 wind tunnel in TsAGI, Russia. Efforts were also made to reduce mass-flow requirements to the actuators by finding the optimal number and location of actuators and implementing the more mass-flow-efficient SaOB (Suction and Oscillatory Blowing) actuator. It was shown that the AFC devices reduced the size of the separated flow region created due to the implementation of the UHBR nacelle. As a result, the lift increased by up to 3% and the flow redirected to the desired down-stream direction.
Join Zoom Meeting
https://zoom.us/j/96584758181?pwd=WC9PMXdsYzJ3NFdEN2Q5ZUtOZEVjdz09 The meeting will be recorded and made available on the School’s site.

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"ZOOM" SEMINAR
SCHOOL OF MECHANICAL ENGINEERING SEMINAR
Wednesday, September 16, 2020 at 14:00

Water Application of Suction and Oscillatory Blowing (SaOB) actuator
Thesis submitted toward the degree of
Master of Science in Mechanical Engineering
Tel-Aviv University

by
Uriel Alerhand Sissa
Under the supervision of Prof. Avi Seifert
Abstract:
The Suction and Oscillatory Blowing (SaOB) actuator is a fluidic device that has been widely studied in air. For the first time, the actuator was adapted and characterized in water. This thesis studies the implementation of the SaOB actuator for water applications. The fluidic oscillator part of the SaOB actuator was successfully adapted to water for future implementation in hydrodynamic vehicles with the objective to conduct Active Flow Control (AFC) in this fluid. After finding the right technique to produce an operational actuator for water, a set of 3 different sized actuators were characterized in water with a Pitot tube and Time Resolved Particle Image Velocimetry. The same actuators were tested in air using Hot-Wire anemometry and pressure sensors with the objective of comparing the performance in both fluids. This comparison was made by calculating with non-dimensional numbers (Strouhal versus Reynolds) to obtain a correlation of similar behavior for water and air. Thus, proving the feasibility of using the SaOB actuator in water at least in the incompressible regime. Furthermore, an array of actuators was designed to oscillate in a synchronized manner with the objective of implementing it in spanwise direction to conduct AFC for underwater applications.
Join Zoom Meeting
https://zoom.us/j/96584758181?pwd=WC9PMXdsYzJ3NFdEN2Q5ZUtOZEVjdz09 The meeting will be recorded and made available on the School’s site.