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Methods for filtering signals in three-component laser Doppler anemometers for separating signals in optical paths of complementary devices are considered. A method is proposed for suppressing the mutual influence of signals based on the use of monochromatic sources of optical radiation with close wavelengths and bandpass optical filters. The possibility of implementing the proposed method of signals optical filtering in three-component laser Doppler anemometers using modern semiconductor laser diodes and bandpass optical filters is shown.

The work continues the work of the previous year. The mass transfer characteristics were experimentally analyzed in a rotary-divergent flow with inserted blades. The laser Doppler anemometer was used for turbulent mass transfer diagnostics. The experimental investigation was used to verify the numerical calculations. As in previous year the model of Reynolds stress transfer describes the flow in range of flow rates from 50 to 250 n.m3/h more adequately than the K-e turbulence model.

The aim of the work is to develop a laser Doppler anemometry method for diagnosing turbulent aerodynamic flows in the near wall region. This will enable measuring two projections of the velocity vector in the range of 0.001 … 400 m/s with a relative error not exceeding 0.1%. The measurement area is 0.1×0.1x0.5mm. The positioning device allows moving the measuring unit in the area of 250×250x250 mm with an accuracy of 0.1 mm. This method also provides the ability to measure local flow rate fluctuations.