Three-hole probe type pressure measurement tail rake for wind tunnel test

Abstract

The invention provides a three-hole probe type pressure measurement tail rake for a wind tunnel test. A plurality of connecting rods are distributed at the top end of a support platform; a three-hole probe is fixed on each connecting rod; a total pressure hole is arranged at the conical top end of each three-hole probe, and two static pressure holes symmetrically distributed on the conical surface of the three-hole probe, and the central line of the total pressure hole and the central lines of the two static pressure holes are in the same horizontal plane. According to the three-hole probe type pressure measurement tail rake, the actual total pressure, static pressure and airflow drift angle at each probe can be obtained through one total pressure hole and two static pressure holes on each probe; then, two velocity components u and v at each probe in the axial direction of a tunnel and in the horizontal plane of the height center of the tunnel can be obtained in combination with measurement of fluid density; according to the obtained static pressure distribution and the distribution of the two velocity components u and v at each three-hole probes, the resistance of a wing section can be obtained on the basis of the momentum theory, so that the two-dimensional velocity and speed drift angles of all points of wake flow can be captured at the same time. The three-hole probe type pressure measurement tail rake for the wind tunnel test is suitable for the situation that the lift force is large and the wake flow inclines to a lower wing face greatly.

Description

technical field [0001] The invention relates to airfoil aerodynamic performance wind tunnel test technology, in particular to a three-hole probe type pressure measuring tail rake for wind tunnel test. Background technique [0002] The technology relevant to the present invention is 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). The measurement mechanism is the total and static pressure measurement tail rake, which is generally composed of dozens or hundreds of total pressure probes, several static pressure probes, support structures and pressure measuring tubes. It is installed behind the airfoil wind tunnel test model and can measure The distribution of total airflow pressure and static pressure along a straight line perpendicular to the direction of incoming flow and the span of the airfoil model at a certain di...

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Problems solved by technology

[0005] In order to overcome the deviation of the results of the total, static pressure and airfoil model resistance caused by the deflection of the wake airflow velocity under the high-lift condition in the prior art, the

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