Three-dimensional measurement system and method for steady-state flow field in large space

Abstract

The invention discloses a three-dimensional measurement system and method for a steady-state flow field in a large space. The three-dimensional measurement system comprises a five-hole probe with a built-in inertial sensor, the five-hole probe is connected with a pressure transmitter, the pressure transmitter is connected with a five-hole probe data processing unit, and the inertial sensor is connected with an inertial sensor data processing unit; the five-hole probe data processing unit and the inertial sensor data processing unit are connected with a data coupling and processing unit and a data recording unit in sequence. The velocity vector measurement is performed on a single point in the steady-state flow field through the five-hole probe, and a measured velocity vector is corrected through an angular velocity gyro of the inertial sensor; the relative position of the steady-state flow field is determined through an inertial sensor line accelerometer, and the measurement on a lot of points in the whole flow field is realized through the five-hole probe, so that the measurement on the steady-state flow field in the large space is realized. The three-dimensional measurement system disclosed by the invention is simple and reliable in structure, convenient to use and wide in application scope and can realize the measurement on the velocity vector of the steady-state flow field, and the maximum measurable direction angle range and accuracy of the five-hole probe are improved.

Description

technical field [0001] The invention relates to the technical field of fluid measurement, in particular to a fast measurement system and measurement method for a velocity vector of a steady-state flow field in a wide range of space based on a five-hole probe. Background technique [0002] The five-hole probe is based on the flow characteristics of the fluid flowing around the sphere for velocity measurement. The five-hole probe is extended to the position of the measured flow field to be measured, and the pressure measured by each hole is considered to be an appropriate correction coefficient. Measure point velocity vector. There are currently two ways to use the five-hole probe: the rotating method and the non-rotating method. The rotation method calibration is relatively simple, but the workload in the process of use is heavy, and the requirements for the measurement environment are high, and accurate angle rotation equipment is required. The calibration workload of the ...

AI Technical Summary

Problems solved by technology

[0003] The five-hole probe has high measurement accuracy, good reliability, simple structure, not easy to damage the probe, easy maintenance and low cost; however, the five-hole probe is limited by its own measurement angle, the measurement calibration and calibration data processing are cumbersome, and the error is difficult to reduce

Especially in the flow field measurement of a large range of space, point-by-point measurement is required. Each measurement needs to align the direction of the five-hole probe, and the measurement position of the five-hole probe should also be calibrated during the measurement process. , for the original ordinary five-hole probe to measure a large range of space, it is time-consuming and laborious, the measurement is difficult, the accuracy is low, and problems such as deviation of speed angle and insufficient accuracy of speed and size often occur

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