Semi-model variable angle mechanism of wind tunnel

Abstract

The invention relates to a semi-model variable angle mechanism of a wind tunnel. The semi-model variable angle mechanism is composed of a large rotating window system, a small rotating window system,a drive system, a transmission system and a limiting system. The large rotating window system consists of a large rotating window, a large-radius arc sliding rail, and a plurality of large-radius sliding blocks; the large-radius arc sliding rail is fixed on a test segment wall board; the large-radius sliding blocks are fixed with the large rotating window; the large rotating window can rotate on the test segment wall board and is supported on the test segment wall board by the large-radius arc sliding rail. An eccentric small rotating window is supported at the large rotating window by a small-radius arc sliding rail. A servo motor and a reducer are used for driving and a worm wheel and a worm rod are used for transmission to drive a semi model to make rotation. With the limiting system, the small rotating window does not exceed a set rotation range; and the limiting system has control and mechanical dual protection functions. An X-shaped support frame is pushed by a lead screw to movealong a light bar and is locked by a locking device, so that the space between the model and the wall board is adjusted. The semi-model variable angle mechanism has advantages of compact structure, stable experiment performance, and high reliability and precision.

Description

technical field [0001] The invention relates to wind tunnel test equipment, in particular to a half-model variable angle mechanism of a wind tunnel. Background technique [0002] In the wind tunnel test, usually because the size of the wind tunnel test section is smaller than the size of the real aircraft / aircraft, the aircraft / aircraft needs to be reduced to a size suitable for the wind tunnel test, made into a model, and tested in the wind tunnel. There are full models and half models. Compared with the full model, under the condition of the same cross-sectional size of the wind tunnel test section, the size of the half model is larger than that of the full model. On the one hand, the strength and stiffness of the model are enhanced, and the geometric shape of the model can be simulated more accurately. The number is high; the half-model test is to support the model from the longitudinal symmetry plane, there is no interference from the tail support or belly support of th...

AI Technical Summary

Problems solved by technology

At subsonic speed, the interference zone of the tail support mechanism is relatively long, and the model position should be closer to the front; while at low supersonic speed, due to the existence of the acceleration zone, the model position must be closer to the rear, and the rotation axis of the rotating part of the existing half-mould angle mechanism The position on the test section is fixed, and it is impossible to achieve both

In addition, the precision of the rotating parts is low, and maintenance is inconvenient. The wear and tear of long-term operation leads to increased clearance, which affects the accuracy and stability of operation.

Usually, the space where the half-model balance is located is connected to the flow field in the wind tunnel, and the temperature change of the airflow in the flow field directly affects the temperature of the balance, which in turn affects the measurement accuracy of the balance

Existing mechanisms for changing half-model angles in wind tunnels usually only have the basic function of changing model angles