High speed droplet/wall surface liquid film oblique impact test device

Abstract

The invention provides a high speed droplet / wall surface liquid film oblique impact test device. The test device comprises a high speed droplet oblique injection device, a liquid film generation device, a gas feeding system, a liquid feeding system and a shooting system. A droplet end cover is replaced and the pressure and pulse length of pulse compression gas entering a cavity are adjusted to generate droplets with different diameters; the air flow entering a droplet acceleration part coated with a super-hydrophobic oleophobic material coating is changed to change the injection speed of the droplets; a droplet injection angle adjusting part is rotated to change the injection angle of the droplets; the liquid feeding amount of the liquid feeding system is changed to change the speed of a liquid film in a liquid film flowing groove; and the height difference between a liquid film thickness adjusting part and the liquid surface of the liquid film flowing groove is adjusted to change the thickness of the liquid film. According to the invention, the influences of the diameter, speed, injection angle, liquid film thickness and liquid film speed of the high speed droplets on the oblique impact state of the high speed droplets / wall surface liquid films can be observed, and the splashing critical condition in the oblique impact process of the high speed droplets / wall surface liquid films is determined.

Description

technical field [0001] The invention relates to a test device, in particular to a high-speed small droplet / wall liquid film oblique collision test device. Background technique [0002] The bearing cavity is an important lubricating part in an aero-engine. The lubricating oil in the bearing cavity is thrown out by the high-speed rotating parts of the bearing and then broken into small high-speed oil droplets. These high-speed small oil droplets of different sizes meet the bearing cavity at different incident angles. After the wall collides, deposits or splashes occur, and finally form the wall oil film and secondary oil droplets. The wall oil film flows along the wall of the bearing cavity and is discharged from the oil discharge port to realize the function of circulating heat dissipation, while the secondary oil droplets flow from the vent port along with the gaseous medium. discharge. As a component of the study of complex oil-gas two-phase flow in the bearing cavity, det...

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Problems solved by technology

However, in the test device in this paper, the droplet incident angle cannot be adjusted, and the droplet collision velocity produced by the test device is too small and the diameter is too large, which is quite different from the actual working conditions of high-speed small oil droplets in the bearing cavity ; In addition, because the liquid film of this test device flows on the inclined wall, this will cause the liquid film thickness and liquid film speed at different positions on the inclined wall to be different, so that the test device cannot accurately analyze the liquid. Effect of film thickness and velocity on droplet / wall liquid film collision

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