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Method for testing velocity field parameters of test flow field of hypersonic aircraft

A hypersonic and parametric testing technology, applied in fluid velocity measurement, velocity/acceleration/shock measurement, instruments, etc., can solve problems such as difficult to ensure efficient mixing of tracer particles, poor followability and distribution uniformity of tracer particles , to achieve the effect of reducing test cost, high uniformity and reducing difficulty

Inactive Publication Date: 2019-11-15
XIAN AEROSPACE PROPULSION TESTING TECHN INST
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Problems solved by technology

[0005] In order to solve the existing velocity field parameter test method of hypersonic vehicle test flow field, it is necessary to sow tracer particles into the flow field, which requires an additional design of tracer particle sowing system, and it is difficult to ensure the efficient mixing of tracer particles and hypersonic test flow field. The technical problems of tracer particle followability and poor distribution uniformity due to mixing, the present invention provides a velocity field parameter test method for hypersonic vehicle test flow field

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  • Method for testing velocity field parameters of test flow field of hypersonic aircraft
  • Method for testing velocity field parameters of test flow field of hypersonic aircraft
  • Method for testing velocity field parameters of test flow field of hypersonic aircraft

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing.

[0021] The principle of the present invention is the same as the velocity field parameter testing method of the existing hypersonic vehicle test flow field, all of which measure the motion velocity of the tracer particles in the measured flow field, and characterize the flow field with the motion velocity of the tracer particles The velocity field parameters of the flow field can be obtained, and the difference between the two is only that: the present invention does not need to sow special tracer particles into the tested flow field, but controls the static temperature, static pressure and The parameter of subcooling degree, the condensate droplets formed in the test flow field are used as the tracer particles for velocity field measurement. Since the particle uniformity is related to the flow field uniformity of the Laval nozzle, as long as the flow field of the Laval noz...

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Abstract

In order to solve the technical problems that the existing method for testing the velocity field parameters of a test flow field of a hypersonic aircraft needs to broadcast tracer particles to the flow field, so that a tracer particle broadcasting system needs to be additionally designed, and the tracer particles are difficult to ensure to be efficiently mixed with the test flow field of the hypersonic aircraft, so that the following performance and the distribution uniformity of the tracer particles are poor, the invention provides a method for testing the velocity field parameters of the test flow field of the hypersonic aircraft. The method provided by the invention is improved in that: based on a Kelvin-Helmholtz critical nucleation radius equation, a nucleation rate equation and a Dobbins liquid growth model, water vapor in an incoming air flow is condensed in a test flow field to form condensed droplets with the particle size of 1-10 micrometers, and the condensed droplets are used as tracer particles for velocity field measurement. The method does not need to scatter special tracer particles into the flow field, so that a corresponding tracer particle scattering system doesnot need to be additionally designed, thereby reducing the test cost and avoiding the problem of scattering special tracer particles into high-temperature and high-pressure pipelines.

Description

technical field [0001] The invention relates to a method for testing velocity field parameters of a hypersonic vehicle test flow field. Background technique [0002] At present, the test method of hypersonic vehicle test flow field velocity field parameters mainly adopts the test method based on particle image velocity field (PIV) technology. This method first needs to broadcast tracer particles into the flow field, and then pass figure 1 The test system shown (the test system includes a double-cavity double-pulse laser 1, a light guide arm 2, a sheet light lens 3, a CCD camera 4, a synchronization controller 5 and a computer 6) is used for measurement. The specific process is: through laser imaging and image Analysis technology, calculate and analyze the velocity of the tracer particles in the flow field, characterize the velocity of the flow field with the velocity of the tracer particles, so that the velocity field parameters of the flow field can be obtained. [0003] T...

Claims

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Application Information

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IPC IPC(8): G01P5/26
CPCG01P5/26
Inventor 章萌石德永麻军德史雪梅付永涛虞虔沈继彬张玉浩唐云龙曹文庆
Owner XIAN AEROSPACE PROPULSION TESTING TECHN INST
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