TY - JOUR
T1 - A Study on the Improvement of Noise Suppression in a Low-Noise Valve of the Multihole Type. 1st Report. Noise Reduction from Multiple Supersonic Parallel-Flow Jets
AU - Nakano, Masami
AU - Tajima, Kiyohiro
AU - Kumaido, Kenji
N1 - Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 1988
Y1 - 1988
N2 - The acoustic characteristics of multiple supersonic jets discharged through a multihole plate have been studied over a range of pressure ratio up to 7, for the purpose of understanding the noise suppression mechanisms and developing acoustically improved multihole valve trim. The effects of multihole configuration (hole size, number of jets, and lateral spacing between holes), are investigated in close relation to the flow behavior by far-and near-field noise measurements and schlieren photography. The acoustic efficiency η, is found to decrease in a power law correlation to the diameter of small hole, and with an increase in the number of jets at high pressure ratios. These trends are discussed from the viewpoint of the noise spectrum modification and an acoustic shielding concept. The lateral spacing mainly affects the relatively low-frequency noise radiating from the downstream merged jet.
AB - The acoustic characteristics of multiple supersonic jets discharged through a multihole plate have been studied over a range of pressure ratio up to 7, for the purpose of understanding the noise suppression mechanisms and developing acoustically improved multihole valve trim. The effects of multihole configuration (hole size, number of jets, and lateral spacing between holes), are investigated in close relation to the flow behavior by far-and near-field noise measurements and schlieren photography. The acoustic efficiency η, is found to decrease in a power law correlation to the diameter of small hole, and with an increase in the number of jets at high pressure ratios. These trends are discussed from the viewpoint of the noise spectrum modification and an acoustic shielding concept. The lateral spacing mainly affects the relatively low-frequency noise radiating from the downstream merged jet.
KW - Acoustic Shielding
KW - Flow Behavior
KW - Fluid Machine Element
KW - Low-noise Valve
KW - Multihole Trim
KW - Multiple Supersonic Jets
KW - Noise Spectrum Modification
KW - Noise Suppression Mechanisms
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U2 - 10.1299/kikaib.54.907
DO - 10.1299/kikaib.54.907
M3 - Article
AN - SCOPUS:0023997406
SN - 0387-5016
VL - 54
SP - 907
EP - 916
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
IS - 500
ER -