A container ship propeller is taken as an example, for its three different tip clearance ratios, i.e. g_t=0.25,g_t=0.35 and g_t=0.45, the measurements of pressure fluctuation induced by the propeller working in a simulated non-uniform flow field are carried out in cavitation tunnel under same propeller operation condition.
For wiping off noise component from differential pressure signal of gas-liquid two-phase flow,and extracting differential pressure fluctuation signal,a signal process method of gas-liquid two-phase flow based on HHT(Hilbert-Huang Transform)was put forward.
The result shows a shift of pressure fluctuation from low frequency mode to high frequency mode as the pipe alters from a necking to a bulging configuration.
Pressure fluctuation measurements collected during the fluidized bed granulation of pharmaceutical granule have been analyzed using the attractor comparison technique denoted as theS-statistic.
The fluidization quality in a gas-fluidized bed of Fe (Iron powder) and Fe/Al2O3 catalyst was determined by the analysis of pressure fluctuation properties, and the results were confirmed with characteristics of methane decomposition.
The properties of the pressure fluctuation for the bed such as the standard deviation, cross-correlation function, dominant frequency and the power spectral density function were obtained through statistical analysis.
Pressure fluctuation properties in combustion of mixture of anthracite and bituminous coal in a fluidized bed