Noise Reduction of a Supersonic Jet Using Gas Injection from a Nozzle Wall

• 荒木, 幹也

• 桑原, 孝輔

• 新井, 正明

• 石間, 経章

• 志賀, 聖一

• 小保方, 富夫

Bibliographic Information

Other Title

• ノズル壁面からの気体噴射による超音速噴流の低騒音化
• ノズル ヘキメン カラ ノ キタイ フンシャ ニ ヨル チョウオンソク フンリュウ ノ テイソウオンカ

Abstract

application/pdf

Journal Article

Effects of gas injection from a nozzle wall on screech reduction of a supersonic under expanded jet are investigated experimentally. From a converging round nozzle, air is injected into the atmosphere (Main jet) at a pressure ratio of 2.25 (M=1.14). The exit diameter of the main jet nozzle is 8.0mm. From small nozzles mounted in the main jet nozzle wall, air is injected in the normal direction to the main jet (Secondary jet). The exit diameter of the secondary nozzles is 1.0mm. The number of the secondary nozzles is selected to be 2 or 4, and the mass flow rate of each secondary jet is set at 2.0% or 4.0% of the main jet. With the secondary jets, the screech SPL is reduced by 23 dB at the maximum, and the frequency profile of the broadband noise is also influenced. And with the secondary jets, the total pressure of the main jet is slightly decreased with the increase in the total mass flow rate of the secondary jets. Consequently, it is shown that the gas injection method is effective in screech reduction with a small loss in the total pressure.

Journal

• 日本機械学會論文集. B編

  日本機械学會論文集. B編 71 (707), 1798-1805, 2005-07-25

  日本機械学会

Keywords

• Supersonic Jet
• Screech
• Noise Reduction
• Gas Injection
• Total Pressure Loss

Details

• CRID: 1050001337661802112
• NII Article ID: 110005051601
• NII Book ID: AN00187441
• ISSN: 03875016
• HANDLE: 10087/2674
• NDL BIB ID: 7432943
• Web Site: https://gunma-u.repo.nii.ac.jp/records/3263
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7432943
• Text Lang: ja
• Article Type: journal article
• Data Source:
  • IRDB
  • NDL
  • CiNii Articles
  • KAKEN