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Hypersonic plif wind tunnel experiment method based on acetone tracer

A hypersonic and wind tunnel experiment technology, applied in the flow field display of non-contact measurement of the hypersonic external flow field, in the field of hypersonic wind tunnel experiments, it can solve the problem that the tracer concentration cannot meet the requirements, the acetone vapor is easy to liquefy, and the mainstream Large air flow and other problems, to achieve the effect of adjustable flow and concentration, high sensitivity, and strong anti-interference ability

Active Publication Date: 2018-08-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, according to the published literature and calculations in the past, the injection of tracer particles in the stable section before the nozzle of the wind tunnel cannot meet the conditions of the PLIF test. The static temperature drops sharply, the acetone vapor volatilized by heating is easy to liquefy, and the mainstream air flow is large, so the tracer concentration cannot meet the requirements

Method used

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  • Hypersonic plif wind tunnel experiment method based on acetone tracer
  • Hypersonic plif wind tunnel experiment method based on acetone tracer
  • Hypersonic plif wind tunnel experiment method based on acetone tracer

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Embodiment Construction

[0041] specific implementation plan

[0042] Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail:

[0043] The hypersonic PLIF imaging diagnostic system based on acetone tracer is characterized in that the hypersonic PLIF imaging diagnostic system based on acetone tracer includes a laser light source system, a sheet beam shaping system, a PLIF image detection system and an acetone tracer agent supply system.

[0044] The laser light source system adopts Nd:YAG laser, and its laser repetition rate and single pulse laser energy can be adjusted according to the shooting object. Nd:YAG laser, the fundamental frequency light is 1064nm, after 4 frequency doubling, it will generate 266nm ultraviolet laser, the specific performance indicators are as follows:

[0045] 1) Repetition frequency: 10-100Hz;

[0046] 2) Single pulse laser energy: 5-12mJ@266nm;

[0047] 3) Pulse width: ~7ns.

[0048] The sheet beam shaping system...

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Abstract

The invention relates to a hypersonic PLIF (Plane Laser Induced Fluorescence) wind tunnel experiment method based on acetone tracer. A hypersonic PLIF imaging diagnosis system based on acetone tracerincludes a laser source system, a sheet-shaped light beam shaping system, a PLIF image detection system and an acetone tracer supply system, and is characterized by taking the acetone as tracing particles, performing particle emission in the vacuum environment of a conventional hypersonic wind tunnel, obtaining a fluorescence signal of the acetone in the hypersonic flow field, applying the PLIF measurement technique to obtain a two-dimensional image of the hypersonic flow field.

Description

technical field [0001] The invention relates to a hypersonic wind tunnel experiment method, which is a flow field display method for non-contact measurement of a hypersonic external flow field, and belongs to the technical field of flow field measurement. Background technique [0002] Hypersonic PLIF (Plane Laser Induced Fluorescence, Plane Laser Induced Fluorescence) imaging diagnostic measurement technology is a new type of undisturbed flow field testing technology, which can realize high-precision visual measurement of concentration field and temperature field. It has non-intervention measurement and does not interfere with the flow field; the time resolution is on the order of ns, which can provide transient information of the flow field; the spatial resolution can reach the order of μm, which can obtain high-precision flow field spatial structure information and strong anti-interference ability, etc. advantage. In recent years, in the field of flow field measurement, m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/06
CPCG01M9/067
Inventor 董昊刘松李铮彭江波刘是成夏天宇张亚晓
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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