Optical measurement method of dynamic pressure on rotor blade surface based on photoelectric sensor
A photoelectric sensor, dynamic pressure technology, applied in the force/torque/work measuring instrument, the measurement of the change in optical properties of the material when it is stressed, and the measurement device, etc., can solve the problem of inaccurate phase signals, image acquisition devices, etc. Problems such as relative displacement with the model under test, to achieve consistent illumination angle and intensity, reduce experimental costs, and save costs
Active Publication Date: 2021-04-02
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
[0008] The existing phase locking method combined with optical pressure sensitive measurement technology has problems such as the triggering of one phase signal and the inaccuracy of other phase triggering, and the relative displacement between the image collector and the measured model during phase adjustment.
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[0028] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:
[0029] Adhere the reflective sheet on the rotor cap, fix the rotary displacement mechanism in front of the rotor blade, fix the photoelectric sensor, image collector and optical pressure-sensitive paint excitation light source at one end of the rotating mechanism boom, and send the signal from the photoelectric sensor as a trigger signal to The image acquisition device required for optical pressure-sensitive measurement, such as image acquisition device or photomultiplier tube, etc., and complete the acquisition of optical pressure-sensitive images; then according to the experimental plan, manually adjust the angle between the boom and the vertical support rod to realize another rotor The signal in one phase is triggered, so that the optical pressure-sensitive image in another phase is collected; by repeating this, the optical pressure-sensitive image in multiple ...
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The invention relates to a rotor blade surface global dynamic pressure measuring device and method based on a phase locking method. An encoder housing is fixed on a motor housing to keep the motor housing still, and an encoder inner shaft is fixed to a motor shaft to enable an encoder to receive the same rotation information when a rotor rotates. An encoder output signal is connected to an encoderreceiving board through a casing hole, the encoder receiving board is connected with a computer and then connected with a signal generating board, the signal generating board is connected with a camera trigger and controls a camera to shoot, and a laser light source is fixed to the front end of a measured blade coated with optical pressure-sensitive paint and aligned with the front end of the measured blade. According to an S-V formula Iref / I = A P / Pref + B of an optical pressure-sensitive coating pressure measurement principle, the real-time pressure P is obtained by measuring the real-timelight intensity I, the reference light intensity Iref and the reference pressure Pref.
Description
technical field [0001] The invention relates to an optical measurement method for dynamic pressure on the surface of rotor blades based on a photoelectric sensor, and belongs to the technical field of instruments and meters. The invention realizes the optical measurement of the dynamic pressure on the surface of the rotor blade at different phases through the precise and adjustable phase, so as to obtain the measurement of the dynamic change of the surface pressure of the rotor blade during the rotation process. Background technique [0002] A high-speed rotating impeller machine is a power machine that converts and transmits energy. It has a wide range of applications, including electric fans, fans, wind turbines in daily life, compressors, turbines (turbines), helicopter rotors, turboprops, etc. in the aerospace field, all of which belong to the category of impeller machinery and are the core of power plant development. One of the components. Pressure is an important aer...
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IPC IPC(8): G01L1/24G01L5/00
CPCG01L1/24G01L5/0061
Inventor 葛宁高丽敏姜衡高天宇郑天龙
Owner NORTHWESTERN POLYTECHNICAL UNIV