year 11, Issue 2 (Journal of Acoustical Engineering Society of Iran 2024)
مجله انجمن علوم صوتی ایران (مهندسی صوتیات سابق) 2024, 11(2): 90-104 |
Back to browse issues page
Abstract: (1317 Views)
In aeroacoustic design, measuring pressure fluctuations as the main source of noise created during flight, is very important. For this purpose, a condenser-microphone connected to a tube is usually used. In this method, instead of placing the pressure sensor directly in the flow, the sensor is installed at the end of the tube and communicates with the flow through the tube. However, the use of the tube can lead to the occurrence of resonance and harmonics in the frequency-space. In the present study, the sensitivity of the frequency-response of the pressure fluctuations probe to its geometrical parameters has been investigated experimentally. The results showed that with increasing tube’s length, the resonance frequency shifted to lower frequencies and the number of harmonics and the phase’s slope increased. In addition, while increasing the tube’s internal diameter does not have a significant effect on the phase of the transfer function, it leads to an increase in its amplitude, resonance frequency, and its harmonics. Finally, by measuring the pressure fluctuations in several standard flows, including the turbulent-flow on a flat-plate, the flow downstream of the wind-tunnel exit jet, and the flow downstream of a circular-cylinder, the accuracy of the designed probe has been ensured.
Article number: 12
Type of Study: Research |
Subject:
Atmospheric Acoustics
Received: 2024/01/21 | Accepted: 2024/06/4 | Published: 2024/11/22
Received: 2024/01/21 | Accepted: 2024/06/4 | Published: 2024/11/22
| Rights and permissions | |
 |
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |