Device and method for real-time monitoring of airflow angle in three-dimensional flow field based on micro-fan-shaped probe

Abstract

A miniature fan-shaped probe for real-time monitoring of airflow angle in a three-dimensional flow field, including a fan-shaped part and a hexagonal platform. The rear end of the probe is a fan-shaped part, and the front end is a hexagonal pedestal. The probe hole is processed on the surface of the hexagonal pedestal. The drilling direction is perpendicular to the bottom surface of the hexagonal pedestal. At least one probe hole is located on the top surface of the hexagonal pedestal. , and the rest of the probe holes are located on the sides of the hexagonal truss. Install multiple micro-sector probes in an array near the lip of the air intake, fix the micro-sector probes in the channel of the lip so that they cannot rotate, detect the angle of attack of the air intake at different positions of the lip, and measure it according to each hole The corresponding directional coefficient formula is obtained by calculating the pressure, and the directional coefficient characteristic map is made from the directional coefficient, and the airflow angle is obtained by interpolating the directional coefficient characteristic map. The invention has the characteristics of easy docking, high frequency response, functional modularization and aerodynamic modeling, and can accurately measure the airflow angle in real time on the basis of reducing disturbance to the 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

Images