The Variational Mode Decomposition (VMD) method was used to decompose the oil pressure signals containing different particle concentrations; the number of components of VMD decomposition is determined by using the criterion of joint comparison between the slope of the center frequency of each component and the main frequency of the component of VMD decomposition, and a method for determining the main components of the signal is proposed by the average energy value; the Hilbert envelope demodulation analysis was carried out for the maximum energy component of each pressure signal. The results showed that the larger the particle concentration in the oil, the greater the number of main components obtained by VMD decomposition, and the proportion of the main components per unit concentration showed a monotonically decreasing trend. The main frequency of the main component is the fundamental frequency of its signal or the multiplication frequency combined with the rotating shaft frequency; there is an amplitude modulation relationship between any components; with the increase of particle concentration, the fundamental frequency of the pressure signal decreases successively; the maximum energy component of each pressure signal has the characteristics of amplitude modulation and frequency modulation in different degrees.
The presence of particles in oil can change the quasi‐sequence structure of the turbulent flow of the oil, and it is extremely important to explore the turbulent energy dissipation rate of the particulate‐containing oil and ensure the safe and stable operation of the oil‐using equipment. Thus, the flow field of the oil containing particles in the pipeline was experimentally studied by a particle image velocimeter (PIV); the turbulent kinetic energy of the oil was calculated using the transient velocity vector field measured by the PIV; and the dissipation rate distribution was calculated using the large eddy PIV method. The influence of different particle sizes and particle concentrations on the normal distribution of the turbulent kinetic energy and dissipation rate was analyzed. The results show that the distribution of the turbulent kinetic energy in the normal direction is non‐unidirectional and in a parabolic shape. The 25 μm particle size has a great influence on the turbulence kinetic energy and the dissipation rate of the oil; with increasing particle concentration, the flow field distribution of the turbulent kinetic energy increases in the region near the wall, and gradually decreases in the central region. The turbulent kinetic energy distribution of the oil is in the shape of a quasi‐cosine; the flow field of the dissipation rate is larger in the near‐wall region and the central region and shows an inverted ‘W’ shape. This provides a theoretical basis for improving the efficiency of oil transportation, discussing the monitoring of particulate matter in oil, and reducing oil pollution.
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