Device and method for realizing three-dimensional flow field airflow angle real-time monitoring based on miniature fan-shaped probe

Abstract

The invention discloses a miniature fan-shaped probe for realizing three-dimensional flow field airflow angle real-time monitoring. The miniature fan-shaped probe comprises a fan-shaped part and a hexagonal frustum, a rear end of the probe is the fan-shaped part, a front end of the probe is the hexagonal frustum, probe holes are machined in a surface of the hexagonal frustum, a punching directionis perpendicular to a bottom surface of the hexagonal frustum, at least one probe hole is located in a top surface of the hexagonal frustum, and the other probe holes are located in side surfaces of the hexagonal frustum. A plurality of miniature fan-shaped probes are arranged near a lip of an air inlet channel in an array manner; and the miniature fan-shaped probes are fixed in a groove channel of the lip and cannot rotate, air inlet attack angles at different positions of the lip are detected, a corresponding direction coefficient formula is calculated according to pressure measured by eachhole, a direction coefficient characteristic graph is made according to direction coefficients, and an airflow angle is obtained through interpolation of the direction coefficient characteristic graph. The probe has characteristics of easiness in butt joint, high frequency response, functional modularization, modeling pneumatization and the like, and can accurately measure the airflow angle in real time on the basis of reducing disturbance of a flow field and improving flow separation.

Description

technical field [0001] The invention relates to a three-dimensional flow field aerodynamic parameter measurement technology, in particular to a method and device for real-time monitoring of three-dimensional flow field airflow angles based on a miniature fan-shaped probe. Background technique [0002] Fluid machinery is widely used in national defense industry and daily life. The process of fluid flowing through fluid machinery largely determines the working characteristics of fluid machinery. At the beginning of the design, people always expect the fluid to flow smoothly through the fluid machine along the solid wall surface molding line, but in the actual working process, the fluid motion direction is affected by many factors, which often makes the fluid motion direction and the fluid machine surface have a certain angle , resulting in the flow of the fluid no longer attached to the surface of the object, resulting in flow separation. Taking aviation aircraft as an exampl...

AI Technical Summary

Problems solved by technology

At the beginning of the design, people always expect the fluid to flow smoothly through the fluid machine along the solid wall surface molding line, but in the actual working process, the fluid motion direction is affected by many factors, which often makes the fluid motion direction and the fluid machine surface have a certain angle , causing the fluid to no longer adhere to the surface of the object, resulting in flow separation

Taking aviation aircraft as an example, when the airflow direction forms a large airflow angle with the wing surface, flow separation will occur, which will reduce the lift of the aircraft and increase the drag, resulting in a decrease in the aerodynamic performance of the aircraft. When the airflow angle is further increased When the stall angle of attack is reached, a serious flight accident will be induced

Similar flow separation phenomenon also occurs on components such as air intake lip and compressor blades of aero-engines, which will reduce the aerodynamic performance of aero-engines

Surface fluid machinery, including fan blades, automobiles, etc., will also be affected by flow separation, which will increase flow loss and increase aerodynamic noise, affecting the working efficiency of machinery and people's quality of life

[0003] For aircraft and engines, once the angle between the airflow and the local geometric surface reaches the stall angle of attack, the aircraft will lose lift and the engine will lose thrust

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