Cavitation Inception Witnessed by Sound Pressure Level Both in Model Test and Prototype Observation
نویسندگان
چکیده
Abstract The paper concerns with the relationship between cavitation inception бi and sound pressure level (SPL). A case study of Xiaolangdi Hydro-project has been taken as a typical example, which demonstrates the standard criterion of SPL indicating cavitation inception. Cavitation inception of an orifice plate used for energy dissipation in a tunnel spillway has been witnessed and verified both in model test and prototype observation. A design criterion has been proposed for a cavitation – free hydraulic structure. It can be served as a reference for designers as well as preliminary findings for fundamental cavitation researchers. Consequently, scale effects are discussed with an aim at suggesting an appropriate factor of safety in design.
منابع مشابه
Influence of Afterbody and Boundary Layer on Cavitating Flow
The characteristics of a cavitation water tunnel test setup and the experiments of cavitation around different models are given in this paper. Models of test are formed from combination of head and variable length afterbody. The experiments are performed initially with the smooth head and then with the roughened head. Cavitation initiates both in the wake and after the head. If the nose of mode...
متن کاملCalculation of the drop in sound pressure level and frequency analysis of aerospace engine test cell (Research Article)
Aerospace engines testing is a source of noise pollution and determining the low frequency acoustic characteristics of the test cell, plays an important role in optimally control of the sound field and reducing the level of sound pressure and pollution. In this study, the drop in average sound pressure level is numerically predicted by constructing a test cell according to ISO 140 standard. To ...
متن کاملICA 2010 paper
Multibubble effects on cavitation inception are studied in detail to show that bubble-bubble interaction can change the inception process of cavitation in a variety of ways. In an effort to develop a high-power pulsed neutron source which uses a giant proton accelerator and liquid mercury, we have attempted to use microbubbles to reduce cavitation damage of the mercury vessels caused by proton-...
متن کاملEffects of model size and free stream nuclei on tip vortex cavitation inception scaling
Because of the complexity of the flow field in a trailing vortex, prediction of tip vortex cavitation inception on a hydrofoil or a propeller still relies heavily on model tests and application of cavitation scaling. Experiments indicate that the major parameters influencing tip vortex cavitation inception are fluid viscosity (Reynolds number) and free stream nuclei (Weber number). A scaling me...
متن کاملNumerical Simulation of Cavitation Inception on Radial Flow Pump
Pump cavitation is the formation and subsequent collapse or implosion of vapor bubbles in a pump. It occurs when the absolute pressure on the liquid falls below the liquid’s vapor pressure. This paper describes the validation of cavitation inception on a radial flow pump which develops 21m of head at 26lps of discharge at its best efficiency point (BEP) of discharge while operating at a speed o...
متن کامل