Abstract
This chapter is devoted to the measurement and analysis of impulsive pressures generated by cavitation bubble collapse. The measurement technique makes use of pressure sensors which may be directly exposed to the cavitating flow or protected from it to limit the risk of damage. The unsteady pressure signals detected by the sensors are made of a succession of pulses of various amplitudes and durations. The analysis consists of determining their distribution as a function of amplitude and duration. Typical pressure pulse measurements are presented in the cases of a cavitating jet, an ultrasonic horn and an attached cavity generated in a high-speed cavitation tunnel. Pressure pulse height or duration spectra follow a Weibull (or a simple exponential) distribution that involves a limited number of parameters such as a reference rate and a reference amplitude or duration. The influence of flow velocity on the reference rate and amplitude is investigated and normalized spectra independent of flow velocity are presented. The correlation between peak pressure rate and pitting rate on various materials is analyzed assuming that a pressure pulse generates a pit if its amplitude exceeds a critical value connected to the material yield stress.
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Chahine, G.L., Franc, JP., Karimi, A. (2014). Cavitation Impulsive Pressures . In: Kim, KH., Chahine, G., Franc, JP., Karimi, A. (eds) Advanced Experimental and Numerical Techniques for Cavitation Erosion Prediction. Fluid Mechanics and Its Applications, vol 106. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-8539-6_4
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DOI: https://doi.org/10.1007/978-94-017-8539-6_4
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