New Method for Monitoring and Correlating Cavitation Noise to Erosion Capability

De, Mattia; Hammitt, Frederick G.

doi:10.1115/1.3241876

Cited by 27 publications

(10 citation statements)

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“…He proposed to evaluate the acoustic energy emitted by any cavitation bubble collapse using linear acoustic theory in which the energy flux E radiated by a pressure wave p is given by the time integral E ¼ 1 qc Ð p 2 dt (qc is the acoustic impedance of the liquid). De and Hammitt [3] defined the cavitation acoustic power as the summation of the previous energy fluxes for all the identified pulses and found, in the case of a Venturi flow, a linear correlation between the cavitation acoustic power and the cavitation damage rate in terms of mean depth of penetration rate (MDPR) (see also Ref. [4]).…”

Section: Introductionmentioning

confidence: 99%

Impact Load Measurements in an Erosive Cavitating Flow

Franc

Riondet

Karimi

et al. 2011

Journal of Fluids Engineering

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International audienceImpact load measurements were carried out in a high-speed cavitation loop by means of a conventional pressure sensor flush-mounted in the region of closure of the cavity where maximum damage was observed. The sensor was dynamically calibrated by the ball drop test technique. Pressure pulse amplitudes were measured at different velocities and constant cavitation number and cavity length. It was found that pressure pulse height spectra follow a simple exponential law, which depends upon two parameters interpreted as a reference peak rate and a reference load. By exploring the dependence of both parameters on flow velocity, it was possible to show that the various histograms measured at different velocities can be reduced to a unique non-dimensional one and derive scaling laws, which enable to transpose results from one velocity to another. The measured values of impact loads are compared to similar data in the literature, and the impact load spectra are discussed with respect to pitting test results available from a previous investigation. It is concluded that an uncertainty remains on the measured values of impact loads and that a special effort should be made to compare quantitatively pitting test results and impact load measurements. To evaluate the coherence of both sets of data with each other, it is suggested to introduce two-dimensional histograms of impact loads by considering the size of the impacted area in addition to the measured impact load amplitude. It is conjectured that the combination of impact load measurements and pitting test measurements should allow the determination of such two-dimensional histograms, which are an essential input for analyzing the material response and computing the progression of erosion with exposure time

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Section: Introductionmentioning

confidence: 99%

Impact Load Measurements in an Erosive Cavitating Flow

Franc

Riondet

Karimi

et al. 2011

Journal of Fluids Engineering

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“…Detected events show exponential distribution. This behavior is shared with other cavitation test facilities (see e.g., [9,10]).…”

Section: Introductionmentioning

confidence: 61%

Assessment of Flow Aggressiveness at an Ultrasonic Horn Cavitation Erosion Test Device by PVDF Pressure Measurements and 3D Flow Simulations

Paepenmöller¹,

Kuhlmann²,

Blume³

et al. 2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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Transient cavitation induced loads are investigated in a flow region subject to severe cavitation erosion at an ultrasonic horn test facility operated in indirect mode, both experimentally and via CFD. A variation of gap width and sensor position is used to vary flow aggressiveness. The experimental technique utilizes piezoelectric sensors based on Polyvinylidene fluordide (PVDF). Sensors are employed at the stationary specimen in close proximity to the oscillating horn tip and wall load spectra are obtained. Complementary CFD studies emulate the experimental sensor. Flow aggressiveness decreases when the gap is widened and increases towards the stationary specimen center. Results from experiment and simulation show good quantitative agreement.

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“…De M. and Hammit F. [5] found a ratio of erosive cavitation aggressiveness to the measured vibrational signal power, which is called cavitation erosion efficiency.…”

Section: A Methodologies Developed So Farmentioning

confidence: 99%

Cavitation Aggressiveness Estimation in Hydro Turbines Based on Cyclostationary Modeling

Marinho

Barúqui

2016

BJIC

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This work proposes a new methodology of detection and identification of erosive cavitation in hydro turbines, which is based on cyclostationary modeling of the cavitation induced vibrational signals. Different cavitation types cause damage to different turbine parts and induce different vibrational signatures, which can be employed to identify and locate the cavitation. Additionally, the cavitation aggressiveness can be estimated using the measured power of vibrational signal. High frequency accelerometers picked up the signals from two real turbines under normal operation. The methodology was implemented in software and a specific hardware was developed to run the software locally. Signals were synthesized in accord with the cyclostationary modeling and employed to validate the proposed methodology. Results obtained from real signals were similar to the ones obtained from synthetic signals, and corroborate the feasibility of this methodology in cavitation monitoring systems.

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New Method for Monitoring and Correlating Cavitation Noise to Erosion Capability

Cited by 27 publications

References 0 publications

Impact Load Measurements in an Erosive Cavitating Flow

Impact Load Measurements in an Erosive Cavitating Flow

Assessment of Flow Aggressiveness at an Ultrasonic Horn Cavitation Erosion Test Device by PVDF Pressure Measurements and 3D Flow Simulations

Cavitation Aggressiveness Estimation in Hydro Turbines Based on Cyclostationary Modeling

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