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Variable Mach number nozzle for hypersonic low-density wind tunnel

A hypersonic, low-density technology, applied in measurement devices, instruments, aerodynamic tests, etc., can solve the problems of complicated calculation of the three-dimensional profile nozzle profile, complex profile shape, difficult processing, etc., to save research and development costs. , The Mach number has a wide variation range, and the quality of the flow field is good.

Inactive Publication Date: 2015-02-18
BEIJING AEROSPACE YISEN WIND TUNNEL ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They usually choose the three-dimensional surface nozzle, and its disadvantages are: the calculation of the three-dimensional surface nozzle is troublesome, the shape of the surface is complex, one Mach number corresponds to a pair of nozzles, the processing is difficult, and the cost is expensive

Method used

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  • Variable Mach number nozzle for hypersonic low-density wind tunnel
  • Variable Mach number nozzle for hypersonic low-density wind tunnel
  • Variable Mach number nozzle for hypersonic low-density wind tunnel

Examples

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Embodiment Construction

[0017] Such as figure 1 , 2 As shown, the hypersonic low-density wind tunnel variable Mach number nozzle includes a throat section 1 and a diffuser section 2, corresponding to several Mach numbers, there are several throat sections 1, and the diffuser section 2 is shared by several Mach number nozzles . The function of changing the Mach number is realized by replacing the throat section 1. The nozzle is arranged in the wind tunnel building. The front end of the throat section 1 is connected to the front chamber by bolts, and the rear end is connected to the diffuser section 2 by bolts. When replacing the throat section 1, the throat section 1 is caught in the middle, and the lifting and replacement cannot be completed. . Therefore, an expansion joint is installed between the diffusion section 2 and the test section, and a sliding bracket 22 is arranged below the diffusion section 2 . When changing the Mach number of the nozzle to replace the throat section 1, loosen the ti...

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Abstract

The invention provides a variable Mach number nozzle for a hypersonic low-density wind tunnel. The variable Mach number nozzle comprises a throat segment and a diffuser segment. The throat segment is connected with a front chamber through bolts; the throat segment is connected with the diffuser segment through bolts. The diffuser segment comprises a conical segment, a sliding support and an expansion joint. The diffuser segment is connected with a test segment through the expansion joint and extends into the test segment. The sliding support is mounted under the conical segment and can drive the diffuser segment to axially move back and forth. The sliding support is fixed on a wind tunnel factory foundation. The throat segments of different profiles can be changed through a back-forth movement of the diffuser segment, leading to different Mach numbers; before changing of the nozzle Mach number, compression of the expansion joint between the diffuser segment and the test segment is adjusted to allow the diffuser segment to axially move back and forth by 10-30mm through the sliding support, and smooth changing of the throat segment is guaranteed. The variable Mach number nozzle is simple in structure, lower in diffuser segment manufacturing cost and lower in equipment cost.

Description

technical field [0001] The invention relates to the field of hypersonic low-density wind tunnels, in particular to a variable Mach number nozzle of a hypersonic low-density wind tunnel. Background technique [0002] The hypersonic low-density wind tunnel is a tool for studying rarefied gas dynamics, and it is also a ground test device for simulating high-altitude and high-speed flight conditions of spacecraft. In this wind tunnel, it is possible to carry out aerodynamic characteristic tests of spacecraft models such as missiles, decoys, satellites and spacecraft return cabins, as well as research experiments on problems related to rarefied gas dynamics such as slip flow state and transition flow state. In a hypersonic low-density wind tunnel, the nozzle is an important part to ensure that the test section obtains a uniform air flow at the design Mach number. [0003] There are very few hypersonic low-density wind tunnels in foreign countries, and there is currently only one...

Claims

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Application Information

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IPC IPC(8): G01M9/04
Inventor 沈逢京穆东波黄炳修
Owner BEIJING AEROSPACE YISEN WIND TUNNEL ENG TECH
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