Multi-line interference Rayleigh scattering speed measuring device for flow field

Abstract

The invention discloses a multi-line interference Rayleigh scattering speed measuring device for a flow field. The device comprises a laser, a multi-line laser probe and flow field interaction unit, a multi-line forward scattered light collection unit, a reference unit and a detection unit; the multi-line laser probe and flow field interaction unit comprises a half-wave plate, a cylindrical focusing lens and a cylindrical microlens array arranged in sequence along the exit light path of the laser; the detection area of a multi-line laser probe is formed on the exit light path of the laser and approaches the focus of the cylindrical focusing lens, the flow field to be measured flows through the detection area, and the direction of the flow field inclines to the exit direction of the laser; the multi-line forward scattered light collection unit is a lens set inclining to the direction of the flow field; the reference unit comprises an incident beam splitter, a reflector and an exit beam splitter; and the detection unit comprises a Fabry-Perot etalon and an ICCD (Intensified Charge Coupled Device) camera arranged along a scattering light path. The device obtains the transient two-dimensional speed of the flow field by measuring the Doppler shift of multi-line forward scattered light, and is suitable for flow speed diagnosis of multiple flow fields.

Description

technical field [0001] The invention relates to a flow field velocity measurement device, especially a measurement device capable of obtaining the flow field transient two-dimensional velocity. Background technique [0002] The experiment and measurement of engine combustion flow field is an important part of engine development. At present, aviation air-breathing engine technology is developing towards extreme combustion conditions such as high temperature, high pressure, high Mach number, and high turbulence. The conventional contact sensor measurement methods can no longer meet the test requirements, and the combustion flow field based on laser and spectrum Laser diagnosis method has become an important tool for quantitative measurement of engine combustion flow field experiment. Among the diagnostic parameters of engine combustion flow field, temperature and velocity are the two most basic parameters. Through the measurement of flow field static temperature and velocity,...

AI Technical Summary

Problems solved by technology

For the measurement of the entire velocity field, it is necessary to scan and measure the detection point, which is limited by the scanning speed and the laser output repetition frequency, and the scanning two-dimensional measurement can only obtain the time-averaged velocity field information

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