3/26/2023 0 Comments Anemometer usesThe instantaneous velocities of the gaseous phase were measured by the LDA system using the parameters presented in Table 2. Consequently, only clean glass particles with an averaged diameter of 700 μm were used. This situation has slightly improved after decreasing the fringe spacing of the interference field to 24.83 μm and, correspondingly, increasing the total number of fringes in the measurement volume to 66. As a result, a continuous registration of signals in the channel of the dispersed phase took place only in the case, when the glass particles were still clean. This means, that we dealt with a situation, where the scattering properties of the glass particles have been modified during the experiments leading to a degradation of the Doppler signals in the direction of the signal detection. The tuning of each LDA channel for registration of its own particles was based on an amplitude discrimination of the Doppler signals by means of changing the parameters characterizing the measurement volume and the geometrical conditions of the receiving optics, and by varying the sensitivity of the photomultiplier as well.ĭistance from the measuring volume to the Hence, it was possible to easily get access to the system depending on the peculiarities of the problem to be solved. The channels were organized by the module principle. The transmitting unit of the LDA channels with a 26 mW and 10 mW laser formed two different measurement volumes in order to distinguish between the velocities of the two groups of particles, the TiO 2 seeding particles and the glass particles with an averaged diameter about 700 μm. The LDA consists of two channels, each channel for the respective phase of the dispersed flow. The forward-scattering Laser Doppler Anemometer (LDA) was used to measure the instantaneous velocities of the gas and particles in the two-phase flow. Sommerfeld, in Engineering Turbulence Modelling and Experime3 MEASUREMENT TECHNIQUE Experimental research of modification of grid-turbulence by rough particles
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