Pressure measurement tail rake for wing section tunnel test

Abstract

The invention provides a pressure measurement tail rake for a wing section tunnel test. Two ends of a cross beam are fixed at the top of a support; a plurality of pressure measurement cones are respectively arranged above the cross beam through a rotating shaft; the pressure measurement cones are streamlined bodies of revolution, and after the aerodynamic center of the pressure measurement cones is arranged at the pressure measurement cone support point, the direction of incoming flow can be captured, and the direction angle of the incoming flow can be measured by angular transducers arranged at the bottom of the cross beam and the lower end of the rotating shaft; a total pressure hole is arranged at the head part of each pressure measurement cone, and a static pressure hole is arranged on the upper surface, a certain distance behind the head part of each pressure measurement cone, one end of a pressure measurement pipe is guided into the total pressure hole and the static pressure hole through the rotating shaft, the other end of the pressure measurement pipe is connected with a pressure data acquisition system, and therefore, the pressure measurement pipe can be used for measuring the total pressure of airflow and the pressure of the static pressure hole, the two-dimensional velocity distribution in the cross beam direction can be calculated, and the resistance of a wing section model in front of the tail rake can be calculated further. The pressure measurement tail rake can be used for accurately measuring the total pressure of airflow at the pressure measurement cones, as well as the velocity, drift angles and two velocity components of airflow at the pressure measurement cones, thereby obtaining the resistance and lift force which act on the wing section model.

Description

technical field [0001] The invention relates to the airfoil aerodynamic performance wind tunnel test technology, in particular to a pressure measuring tail rake used for the airfoil wind tunnel test. Background technique [0002] In the prior art, the measurement mechanism involved in the airfoil wind tunnel test momentum method resistance measurement technology (see Wang Tiecheng's "Aerodynamic Test Technology", National Defense Industry Press, 1986, 6-5 section momentum method experiment) is total pressure, The tail rake for static pressure measurement is generally composed of a large number of total pressure tubes, several static pressure tubes, support structures and pressure measuring tubes. It is installed behind the airfoil wind tunnel test model and can measure a certain distance behind the airfoil model (usually 0.5 to 1.2 times the chord length of the airfoil model), the total airflow pressure and static pressure distribution along the straight line perpendicular t...

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Problems solved by technology

[0005] In order to overcome the deflection of the total pressure, static pressure and airfoil drag coefficient results caused by the deflection of the wake airflow velocity in the prior art, as well as the inability to capture the airflow angle, the present invention proposes a method for airfoil wind Piezometric Tail Rakes for Hole Tests

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