Miniature total pressure probe and its manufacturing method

Abstract

The invention is a miniature total press probe and its making method. The probe is made up of a 3-rated outside circles, terraced tube whose head outside diameter is 0.2 mms. The ratio of these three circles' diameters is 1:2:5 while the ratio of the lengths is 1:(3-5):.(8-12).The producing method is to adopt the tiny electrical spark and the tiny electrolysis compound process to pack the parts once. The positioning accuracy can attain to 2 ums. The detailed craft is as follows:1 tiny electrical sparks processing craft;2 tiny electrolysis of pure water processing craft;3 tiny operation craft. Here are the advantages: provide the valid measure means for tiny fluid mechanics experiments; the special design of the probe guarantees that the valid measure dimension stays between millimeters and centimeters of total press distribution, and makes sure that the probe's rigidity can bear the strength of the tiny dimension-low Renault current of air without being impacted. The advantages are low cost and conveniently use.

Description

technical field [0001] The invention relates to a miniature total pressure probe for measuring pressure in a flow field and a manufacturing method thereof, belonging to flow field measurement technical equipment. Background technique [0002] On the basis of the rapid development of micro-electro-mechanical systems (MEMS) in recent years, micro-machines such as micro-aircraft, micro-turbine engines, micro-satellites and micro-rockets have appeared in the field of aerospace. To carry out technical work such as the research and development of various miniaturized devices involving fluid motion, it is necessary to conduct corresponding micro-scale flow field experimental research. [0003] At present, there are quite a lot of micro-scale flows, especially those with characteristic scales on the order of millimeters and centimeters. At present, there is still a lack of effective experimental measurement methods for micro-flows at this level. So far, most micro-flow experiments ...

AI Technical Summary

Problems solved by technology

So far, most micro-flow experiments at home and abroad have only measured the pressure difference between the inlet and outlet of the channel, and obtained only the average frictional resistance characteristics of the micro-scale flow, and the distribution along the process cannot be known, and the results inevitably include the inlet and outlet. Flow loss, so the measurement results are not detailed and accurate

Using molecular tracking velocimetry (MTV) and microparticles picture Velocimetry technology (M-PIV) can obtain detailed flow field velocity distribution information, but because this type of equipment is expensive (worth more than several million yuan) and the use of technology is complicated, its use is limited, and it is generally used for micron-scale micrometers. Experimental Measurement of Flow

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