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Ludwieg tube wind tunnel and high Mach number expansion method thereof

A wind tunnel and nozzle technology, which is applied in the testing of machines/structural components, instruments, measuring devices, etc., to achieve the effect of improving the quality of the flow field and the method is simple

Active Publication Date: 2020-07-17
AERODYNAMICS NAT KEY LAB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional Ludwieg (Ludwieg) tube wind tunnel expansion technology from basic Mach number to high Mach number is temporarily vacant

Method used

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  • Ludwieg tube wind tunnel and high Mach number expansion method thereof
  • Ludwieg tube wind tunnel and high Mach number expansion method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0032] Embodiment: Ludwig tube wind tunnel variable Mach number method. In this embodiment, a Ludwig tube wind tunnel with a base Mach number of 5 and an outlet diameter of 600 mm is selected for high Mach number expansion design.

[0033] Specific steps are as follows:

[0034] 1. Design stable section

[0035] The internal profile before the throat of the stable section is consistent with the internal profile of the Mach 5 nozzle in the wind tunnel. Make sure that the quick opening valve and the stabilizer section constriction are properly engaged. The outlet diameter selection of the stable section is guaranteed to be consistent with the diameter of the air storage section of the wind tunnel. The length of the stable section is selected as twice the diameter of the outlet of the nozzle, that is, 1.2 meters. The internal profile of the expansion part of the stable section is obtained through a simple profile design.

[0036] 2. Install a high Mach number nozzle

[0037]...

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Abstract

The invention discloses a Ludwieg tube wind tunnel and a high Mach number expansion method thereof, and belongs to the technical field of hypersonic speed wind tunnels. According to the invention, a stable section is added on the basis of a traditional Ludwieg tube wind tunnel; an inlet of the stable section is matched with an outlet of a quick-opening valve; an outlet of the stable section is matched with an inlet of a spray pipe; a stable subsonic flow field is formed between the wind tunnel quick-opening valve and a spray pipe section; meanwhile, a throat specification replaceable spray pipe matched with the stable section is designed, and due to the addition of the stable section, the operation mach number of the wind tunnel can be expanded to a high mach number only by replacing spraypipes with different throat specifications on the premise of not changing other parts of the wind tunnel. Through the technical scheme of the invention, the high mach number expansion of the Ludwiegtube wind tunnel can be realized. The method for expanding the high Mach number wind tunnel is simple and economical, a good test flow field is easy to obtain, and in addition, the method can also beused as a method for improving the quality of the flow field of the Ludwieg tube wind tunnel.

Description

technical field [0001] The invention belongs to the technical field of hypersonic wind tunnels, and more specifically relates to a Ludwig tube wind tunnel and a method for extending a high Mach number thereof. Background technique [0002] The hypersonic wind tunnel is an aerodynamic ground experiment platform and an indispensable experimental equipment for the study of aerodynamics. Conventional Ludwieg tube wind tunnels have low construction, use and maintenance costs, high operating efficiency, and stable operating total temperature and pressure. However, the conventional Ludwieg tube wind tunnel has a single Mach number, which is not suitable for experimental research on aerodynamics in the large speed range. At present, only conventional Ludwieg (Ludwieg) tube wind tunnels have been reported to expand from the basic Mach number to low Mach numbers, and the exploration of hypersonic vehicles requires the support of high Mach number wind tunnel equipment. Conventional L...

Claims

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Application Information

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IPC IPC(8): G01M9/02G01M9/04
CPCG01M9/02G01M9/04
Inventor 陈坚强吴杰余涛袁先旭赵家权张毅锋
Owner AERODYNAMICS NAT KEY LAB
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