Device for observing micro-gap gas film flow field of aerostatic bearing

Abstract

The invention relates to a device for observing the micro-gap gas film flow field of an aerostatic bearing. The device comprises a gas source system, a bearing system and a laser observation system; the gas source system comprises a compressor used for generating high-pressure gas, a tracer particle generator used for generating tracer particles and a tracer particle box used for forming high-pressure tracer particle mixed gas; the air outflow end of the tracer particle box is connected with the bearing system through an air pressure sensor; the bearing system comprises a bearing thrust plate and a bearing bearing surface which are horizontally arranged along a vertical direction, and a bearing gas film gap is formed between the bearing thrust plate and the bearing bearing surface; the laser observation system comprises a first light beam group and a second light beam group of which light paths are perpendicular to each other; and the first light beam group, the bearing gas film gap, a filtering concave lens, a microscope objective and a high-speed camera are coaxially arranged in sequence. According to the device for observing the micro-gap gas film flow field of the aerostatic bearing of the invention, a pinhole imaging principle is adopted, a bearing gas film gap outlet boundary is used as an imaging pinhole, and a light path is changed into parallel light by using the filtering concave lens for flow field observation.

Description

technical field [0001] The invention relates to the technical field of lubricating ultra-precision gas bearings, in particular to an observation device for micro-gap gas film flow field of gas static pressure bearings. Background technique [0002] Aerostatic bearings are widely used in aerospace, precision instruments, ultra-precision machine tools and other fields. The gas film flow field of aerostatic bearing has a great influence on the performance of the bearing. However, the air film gap is very small, which is not conducive to online observation, thus affecting the in-depth study of the air film flow field characteristics. Therefore, the existing research at home and abroad basically studies the gas film flow field characteristics of aerostatic bearings from the perspective of theoretical analysis and numerical simulation, and there are very few studies based on experiments. The observation experiment of the gas film flow field of the aerostatic bearing is of great ...

AI Technical Summary

Problems solved by technology

However, since the device irradiates the flow field through a beam of laser light through the bearing surface, the material must be transparent glass or new plastics, which limit the inlet pressure, which is somewhat different from the actual gas film flow field gap

Secondly, since the laser will irradiate the particles through the bearing surface, and then let the light reflected by the particles be received and imaged through the bearing surface, the refraction of light and the loss of light intensity will occur, which will affect the imaging quality and cause distortion of the image, resulting in larger Experimental error

Images