Passive Control of Rectangular Cavity Flows using Span wise obstacles

Abstract

"Flow over deep cavities is considered in this study. The objective of this work is to recognize the noise reduction of a cavity studied by many researchers. To understand the causes of this noise we started by an experimental investigation for the upstream boundary layer that focuses on the noise oscillations in a deep cavity characterized by its aspect ratio (length to depth ratio) L/H=0.2, as a function of free stream velocity studied in a 2x2 m2 wind tunnel; using a single hot wire anemometer, velocity measurements were taken to determine the mechanism. Velocity measurements show that velocity profiles are highly affected by the cavity. PIV measurements are used to identify the presence of vertical structures along the cavity. A span wise cylinder, placed near the cavity leading edge, plays the role of noise control which eliminates the propagation of noise and modifies the structure of the shear layer. We also made a comparison between two different cavity types to help us with the understanding of the cavity flow topic, and this will take place in the last part of this study. "

Student(s)

Abdelhameed Naser Jabado

Supervisor(s)

Dr. Hassan Assoum, Dr. Mohammad Elhasan