News and Events

活動資訊

2013 年 05 月 24 日
Seminar - Drag reduction with suction and pulsed blowing actuator by Dr. Avrahame Seifert

Date:   24 May 2013 (Friday)

Time:   11:00 am – 12:00 pm

Venue:  EF305, The Hong Kong Polytechnic University

Abstract:

The lecture will review two recent experiments conducted on 2D and axis-symmetric bluff-bodies with the intention of drag reduction.

The Suction and Pulsed Blowing actuator was developed by the Tel Aviv University for both experiments. The Reynolds number range was between 50,000 and 5,000,000. A systematic parameter variation was performed in both studies. Turbulent flow was verified upstream of separation. Significant drag reduction was achieved due to the combination of steady suction and pulsed blowing. Enhanced overall system efficiency was found at low actuation magnitudes. Preferred span wise spacing was identified and utilized for enhanced effectiveness.

Biosketch:

Dr. Avrahame (“Avi”) Seifert is a Professor of Mechanical Engineering at Tel Aviv University, Israel and also the head of the Meadow Aerodynamics Laboratory as well as the head of the School of Mechanical Engineering. Prof. Seifert is an expert in low speed Aerodynamics and Active Flow Control. Dr. Seifert develops methods and devices to alter the natural development of flows using localized, minute, unsteady energy expenditure utilizing flow instability instead of brute force. Prof. Seifert received his entire education at Tel Aviv University, before leaving for post-doc at NASA Langley. He is Faculty at Tel Aviv University since 1999. Dr. Seifert published close to 50 peer-reviewed Journal papers, has 5 patents (several more pending) and educated more than two dozen graduate students. Prof. Seifert served as the Vice Dean for Research, Engineering and now serves as the Head, School of Mechanical Engineering. His recent research interests focus on energy aspects of flow related systems and the environment. Specifically, Aerodynamic drag reduction of heavy transportation systems (like trucks, trains and busses) and enhanced effectiveness of wind turbines, in urban settings and near transportation systems. Prof. Seifert is a world leader in developing actuators for flow control and four of his patents are in this area of R&D.