Pressure and noise induced by a cavitating marine screw propeller

Dissertation

Jerzy Matusiak

Research output: ThesisDissertationMonograph

Abstract

A method of evaluating the intermittent propeller blade fixed cavitation and shedding of free cavitation bubbles is presented. The number and size of free, spherical cavitation bubbles are related to the variation of propeller blade attached cavitation. The beta type probability density distribution of the initial bubble size is proposed. This distribution is normalized with respect to the sheet cavitation thickness. The effect of the simplifications in the dynamic model of the cavitation bubbles on their collapse downstream of partially and fully cavitating hydrofoils is discussed. The method of calculating the low frequency pressures induced by fixed blade cavitation and high frequency broadband noise caused by the collapse of free bubbles in propeller flows is presented. The method yields noise spectra in the frequency range from the blade passing frequency to tens of kilohertz. Computed pressure and noise induced by the cavitating propellers are compared to the values measured in model and full scale experiments. The fractal structure of the bubble cloud and the proposed method of evaluating the collapse of the bubble cloud downstream of the fixed cavities yield noise spectra which correlate well with the experimental results of full and model scale measurements.
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Helsinki University of Technology
Award date17 Feb 1992
Place of PublicationEspoo
Publisher
Print ISBNs951-38-4065-4
Publication statusPublished - 1992
MoE publication typeG4 Doctoral dissertation (monograph)

Fingerprint

propellers
screws
cavitation flow
bubbles
propeller blades
noise spectra
blades
hydrofoils
scale models
simplification
dynamic models
density distribution
fractals
frequency ranges
low frequencies
broadband
cavities

Keywords

  • marine propellers
  • propeller blades
  • pressure distribution
  • pressure
  • excitation
  • noise (sound)
  • cavitation noise
  • marine propeller noise
  • cavitation
  • bubbles
  • mathematical models
  • calculations

Cite this

Matusiak, J. (1992). Pressure and noise induced by a cavitating marine screw propeller: Dissertation. Espoo: VTT Technical Research Centre of Finland.
Matusiak, Jerzy. / Pressure and noise induced by a cavitating marine screw propeller : Dissertation. Espoo : VTT Technical Research Centre of Finland, 1992. 107 p.
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title = "Pressure and noise induced by a cavitating marine screw propeller: Dissertation",
abstract = "A method of evaluating the intermittent propeller blade fixed cavitation and shedding of free cavitation bubbles is presented. The number and size of free, spherical cavitation bubbles are related to the variation of propeller blade attached cavitation. The beta type probability density distribution of the initial bubble size is proposed. This distribution is normalized with respect to the sheet cavitation thickness. The effect of the simplifications in the dynamic model of the cavitation bubbles on their collapse downstream of partially and fully cavitating hydrofoils is discussed. The method of calculating the low frequency pressures induced by fixed blade cavitation and high frequency broadband noise caused by the collapse of free bubbles in propeller flows is presented. The method yields noise spectra in the frequency range from the blade passing frequency to tens of kilohertz. Computed pressure and noise induced by the cavitating propellers are compared to the values measured in model and full scale experiments. The fractal structure of the bubble cloud and the proposed method of evaluating the collapse of the bubble cloud downstream of the fixed cavities yield noise spectra which correlate well with the experimental results of full and model scale measurements.",
keywords = "marine propellers, propeller blades, pressure distribution, pressure, excitation, noise (sound), cavitation noise, marine propeller noise, cavitation, bubbles, mathematical models, calculations",
author = "Jerzy Matusiak",
note = "Project code: LAIT9411",
year = "1992",
language = "English",
isbn = "951-38-4065-4",
series = "VTT Publications",
publisher = "VTT Technical Research Centre of Finland",
number = "87",
address = "Finland",
school = "Helsinki University of Technology",

}

Matusiak, J 1992, 'Pressure and noise induced by a cavitating marine screw propeller: Dissertation', Doctor Degree, Helsinki University of Technology, Espoo.

Pressure and noise induced by a cavitating marine screw propeller : Dissertation. / Matusiak, Jerzy.

Espoo : VTT Technical Research Centre of Finland, 1992. 107 p.

Research output: ThesisDissertationMonograph

TY - THES

T1 - Pressure and noise induced by a cavitating marine screw propeller

T2 - Dissertation

AU - Matusiak, Jerzy

N1 - Project code: LAIT9411

PY - 1992

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N2 - A method of evaluating the intermittent propeller blade fixed cavitation and shedding of free cavitation bubbles is presented. The number and size of free, spherical cavitation bubbles are related to the variation of propeller blade attached cavitation. The beta type probability density distribution of the initial bubble size is proposed. This distribution is normalized with respect to the sheet cavitation thickness. The effect of the simplifications in the dynamic model of the cavitation bubbles on their collapse downstream of partially and fully cavitating hydrofoils is discussed. The method of calculating the low frequency pressures induced by fixed blade cavitation and high frequency broadband noise caused by the collapse of free bubbles in propeller flows is presented. The method yields noise spectra in the frequency range from the blade passing frequency to tens of kilohertz. Computed pressure and noise induced by the cavitating propellers are compared to the values measured in model and full scale experiments. The fractal structure of the bubble cloud and the proposed method of evaluating the collapse of the bubble cloud downstream of the fixed cavities yield noise spectra which correlate well with the experimental results of full and model scale measurements.

AB - A method of evaluating the intermittent propeller blade fixed cavitation and shedding of free cavitation bubbles is presented. The number and size of free, spherical cavitation bubbles are related to the variation of propeller blade attached cavitation. The beta type probability density distribution of the initial bubble size is proposed. This distribution is normalized with respect to the sheet cavitation thickness. The effect of the simplifications in the dynamic model of the cavitation bubbles on their collapse downstream of partially and fully cavitating hydrofoils is discussed. The method of calculating the low frequency pressures induced by fixed blade cavitation and high frequency broadband noise caused by the collapse of free bubbles in propeller flows is presented. The method yields noise spectra in the frequency range from the blade passing frequency to tens of kilohertz. Computed pressure and noise induced by the cavitating propellers are compared to the values measured in model and full scale experiments. The fractal structure of the bubble cloud and the proposed method of evaluating the collapse of the bubble cloud downstream of the fixed cavities yield noise spectra which correlate well with the experimental results of full and model scale measurements.

KW - marine propellers

KW - propeller blades

KW - pressure distribution

KW - pressure

KW - excitation

KW - noise (sound)

KW - cavitation noise

KW - marine propeller noise

KW - cavitation

KW - bubbles

KW - mathematical models

KW - calculations

M3 - Dissertation

SN - 951-38-4065-4

T3 - VTT Publications

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Matusiak J. Pressure and noise induced by a cavitating marine screw propeller: Dissertation. Espoo: VTT Technical Research Centre of Finland, 1992. 107 p.