Variable Mach number nozzle in hypersonic low density wind tunnel

A hypersonic, low-density technology, applied in the direction of measuring devices, instruments, aerodynamic tests, etc., can solve the problems of troublesome calculation of the three-dimensional profile nozzle, complex profile shape, high cost, etc., to save research and development funds , Mach number range is wide, and the quality of the flow field is good
CN104359644BInactive Publication Date: 2017-03-01BEIJING AEROSPACE YISEN WIND TUNNEL ENG TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING AEROSPACE YISEN WIND TUNNEL ENG TECH
Publication Date
2017-03-01
Estimated Expiration
Not applicable · inactive patent

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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.
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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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