Hypersonic wind tunnel airflow stabilizing device

Abstract

The invention provides a hypersonic wind tunnel airflow stabilizing device. The hypersonic wind tunnel airflow stabilizing device comprises a shell cylinder, a sliding cylinder, a supporting cylinder, a heating element and a heat storage cylinder. The two ends of the shell cylinder are each provided with a flange. The sliding cylinder, the supporting cylinder and the heat storage cylinder are sequentially arranged in the shell cylinder. A plurality of bosses are welded to the outer wall of the sliding cylinder and arranged in the shell cylinder in the manner of abutting against the inner surface of the shell cylinder. A heat insulation layer is fixed between the sliding cylinder and the supporting cylinder. The heating element is installed between the supporting cylinder and the heat storage cylinder. The heat storage cylinder is a cylinder with a smooth inner wall and is provided with a front expansion segment, a middle straight segment and a rear contraction segment, one end of the heat storage cylinder is welded to the flange at one end of the shell cylinder, and the other end of the heat storage cylinder is inserted in the flange at the other end of the shell cylinder. According to the hypersonic wind tunnel airflow stabilizing device, the starting time of a wind tunnel is shortened obviously, testing efficiency is improved, manufacturing is facilitated, and installation is convenient.

Description

technical field [0001] The invention relates to the field of aerodynamics, in particular to a conventional hypersonic wind tunnel equipment component and an airflow stabilizing section device with an electric heating function. Background technique [0002] When a conventional hypersonic wind tunnel is in operation, the air flow in the wind tunnel passes through pipes, valves, heaters and other equipment, causing large disturbances, turbulent flow, and uneven flow velocity; before the main airflow enters the nozzle, an airflow stabilization device is required to rectify it in order to achieve uniform flow velocity. There is no deflection in the airflow direction along the nozzle axis, and the airflow turbulence is low. In use, there are different stable section structures according to the difference in airflow temperature in the wind tunnel. [0003] Usually, the way for wind tunnels to rectify the normal temperature and low temperature airflow is to add perforated plates, h...

AI Technical Summary

Problems solved by technology

The method adopted is to wrap the electric heating tape outside the shell of the stable section, however, the heating temperature of the stable section must be limited in this way

Considering the pressure resistance requirements of the shell, the heating temperature is generally limited to below 200°C to prevent uneven heating of the wall surface of the shell shell and local heating to reduce the compressive strength of the shell shell. Thicker, large heat absorption, slow temperature rise, large power consumption, resulting in waste

For wind tunnels with Ma greater than 7, there is a certain risk in applying this method. If the wind tunnel works under the condition of a higher Ma number, the working pressure of the main air flow is generally greater than 5.0MPa, and there is a risk in using shell wall heating. In actual engineering, generally do not use

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