TURBULENCE CHARACTERISTICS OF THE NOISE PRODUCING REGION OF AN EXCITED ROUND JET. PART 2. LARGE-SCALE STRUCTURE CHARACTERISTICS.

Constantine Baltas, Philip John Morris

Research output: Contribution to journalArticle

Abstract

Experiments were conducted to determine large-scale turbulence characteristics of the noise-producing region of a 3 in. cold excited round jet. The jet was excited by plane acoustic waves with a very high amplitude of excitation (2% of the jet dynamic head), and at Strouhal number of 0. 5. The flow Reynolds number was 2. 8 multiplied by 10**5. The exit boundary layer was artificially tripped to a turbulent state with sandpaper strips. All the data were obtained with single and X-hot-wires and processed in digital form. Large-scale characteristics were determined through the examination of the hot-wire records. The method involved the ensemble-averaging of the records with a conditional criterion based on the frequency of excitation. The results showed a wave-like behavior of the velocity components through the mixing region.

Original languageEnglish (US)
JournalAIAA Paper
StatePublished - 1984

Fingerprint

Turbulence
Wire
Strouhal number
Boundary layers
Reynolds number
Acoustic waves
Experiments

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

@article{f25d347d94d44525908e451c196e3b2f,
title = "TURBULENCE CHARACTERISTICS OF THE NOISE PRODUCING REGION OF AN EXCITED ROUND JET. PART 2. LARGE-SCALE STRUCTURE CHARACTERISTICS.",
abstract = "Experiments were conducted to determine large-scale turbulence characteristics of the noise-producing region of a 3 in. cold excited round jet. The jet was excited by plane acoustic waves with a very high amplitude of excitation (2{\%} of the jet dynamic head), and at Strouhal number of 0. 5. The flow Reynolds number was 2. 8 multiplied by 10**5. The exit boundary layer was artificially tripped to a turbulent state with sandpaper strips. All the data were obtained with single and X-hot-wires and processed in digital form. Large-scale characteristics were determined through the examination of the hot-wire records. The method involved the ensemble-averaging of the records with a conditional criterion based on the frequency of excitation. The results showed a wave-like behavior of the velocity components through the mixing region.",
author = "Constantine Baltas and Morris, {Philip John}",
year = "1984",
language = "English (US)",
journal = "AIAA Paper",
issn = "0146-3705",

}

TY - JOUR

T1 - TURBULENCE CHARACTERISTICS OF THE NOISE PRODUCING REGION OF AN EXCITED ROUND JET. PART 2. LARGE-SCALE STRUCTURE CHARACTERISTICS.

AU - Baltas, Constantine

AU - Morris, Philip John

PY - 1984

Y1 - 1984

N2 - Experiments were conducted to determine large-scale turbulence characteristics of the noise-producing region of a 3 in. cold excited round jet. The jet was excited by plane acoustic waves with a very high amplitude of excitation (2% of the jet dynamic head), and at Strouhal number of 0. 5. The flow Reynolds number was 2. 8 multiplied by 10**5. The exit boundary layer was artificially tripped to a turbulent state with sandpaper strips. All the data were obtained with single and X-hot-wires and processed in digital form. Large-scale characteristics were determined through the examination of the hot-wire records. The method involved the ensemble-averaging of the records with a conditional criterion based on the frequency of excitation. The results showed a wave-like behavior of the velocity components through the mixing region.

AB - Experiments were conducted to determine large-scale turbulence characteristics of the noise-producing region of a 3 in. cold excited round jet. The jet was excited by plane acoustic waves with a very high amplitude of excitation (2% of the jet dynamic head), and at Strouhal number of 0. 5. The flow Reynolds number was 2. 8 multiplied by 10**5. The exit boundary layer was artificially tripped to a turbulent state with sandpaper strips. All the data were obtained with single and X-hot-wires and processed in digital form. Large-scale characteristics were determined through the examination of the hot-wire records. The method involved the ensemble-averaging of the records with a conditional criterion based on the frequency of excitation. The results showed a wave-like behavior of the velocity components through the mixing region.

UR - http://www.scopus.com/inward/record.url?scp=0021661224&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0021661224&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0021661224

JO - AIAA Paper

JF - AIAA Paper

SN - 0146-3705

ER -