Air flotation force measuring device of wind tunnel model

Abstract

The invention relates to an air flotation force measuring device of a wind tunnel model, and mainly relates to a device for measuring the force of a wind tunnel testing model by adopting an air flotation support. In order to solve the problem that the traditional force measuring technology and a conventional fore measuring element can not satisfy the requirements on higher aerodynamic force elevating force, smaller aerodynamic force resistance and high-precision measurement of the resistance, the invention has the technical scheme that the air floatation force measuring device comprises a multi-component force measuring balance, a model fulcrum bar, a firing case, a notching sunk screw, a precise air flotation lead rail, an internal hexagon screw, a sensor permanent seat, a force measuring trouble eliminating rod, a high-precision axial tension and compression sensor, a sensor connecting rod, a precise air floatation lead rail permanent seat, an internal hexagon fixing screw, an internal hexagon backing-up screw, a bidirectional tightening nut, a model angle changing system and an air supply pump. When the wind tunnel model is floated, air floatation force measuring test of transformation of angle of attack and angle of the sideslip of the wind tunnel model can be realized. When the ratio of the elevating force and the resistance is greater, and the elevating force generates greater interference for the resistance measurement, dynamic and statistic high-precision measurement can be achieved.

Description

1. Technical field [0001] The invention relates to an air flotation force measuring device for a wind tunnel model, which mainly uses an air flotation support to measure the force of a wind tunnel test model. 2. Background technology [0002] Force measurement is the most basic test item in wind tunnel test. The conventional force-measuring element is a strain rod balance. After the force-measuring element is connected to the support rod, it is then connected to the wind tunnel model. The deformation of the force-measuring element directly measures the wind tunnel model. The strain of the load cell is proportional to the magnitude of the external force. At present, the technology and material characteristics of the existing load cell itself are required to have both large aerodynamic lift and small aerodynamic resistance, and at the same time require high-precision measurement of resistance. The force method is difficult to implement, and the accuracy cannot meet the requi...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing force-measuring technology and conventional force-measuring elements cannot meet the requirements of "not only requiring a large aerodynamic lift force, but also requiring a small aerodynamic drag force, and at the same time requiring high-precision measurement of resistance", in When the lift and drag ratio of the wind tunnel model is large, the resistance can be measured with high precision and high sensitivity. The invention provides a force measuring device using air flotation support to realize the resistance measurement of the wind tunnel model when the lift and drag ratio is large. high precision measurement

Images