Gas-liquid two-phase ejector based on coordinated regulation of affinity combination surface

Abstract

The invention provides a gas-liquid two-phase ejector based on coordinated regulation of an affinity combination surface. The ejector comprises the following parts of an active nozzle for ejecting working fluid; an ejection nozzle for ejecting ejection fluid; a mixing cavity connected to the active nozzle and the ejection nozzle for mixing the working fluid and the ejection fluid to form a mixed fluid; an outlet diffuser cavity connected to the mixing cavity to pressurize and discharge the mixed fluid; and an adjustment spray needle arranged in the active nozzle to adjust the throat area of the active nozzle, wherein the inner surfaces of the active nozzle, the mixing cavity and the outlet diffusion cavity are of a micro-nano composite structure with oleophobic and liquid working fluids, which are used to promote the lubricating oil and liquid working fluid to autonomously bounce towards the center of the flow field of the injector; and the surface of the adjustment spray needle is ofa micro-nano composite structure of lipophilic and liquid working medium, which is used to make the lubricating oil and liquid working medium flow in the direction of a micro-nano channel in the axialdirection of the adjustment needle, and enter the mixing cavity with the high-speed fluid at the end of the adjustment spray needle.

Description

technical field [0001] The invention belongs to the technical field of ejectors and ejector circulation systems, and in particular relates to a gas-liquid two-phase ejector based on synergistic regulation of a hydrophilic-phobic combined surface. Background technique [0002] An ejector is a device that uses a high-pressure fluid to pump a low-pressure fluid and is widely used in chemical engineering, nuclear reactors, power plants, petroleum and refrigeration industries. In the vapor compression heat pump refrigeration cycle system, replacing the traditional throttle valve with an ejector can significantly improve the system performance efficiency. The performance efficiency of the gas-liquid two-phase ejector can be adjusted and optimized by adjusting the nozzle and the wall heating of the ejector. The dryness of the ejector outlet affects the cooling and heating capacity and system efficiency of the ejector heat pump circulation system, and the compressor lubricating oil ...

AI Technical Summary

Problems solved by technology

Under the current refrigeration and air-conditioning conditions, the maximum temperature in the system is much lower than the boiling point of the lubricating oil, and the lubricating oil always exists in liquid form. In the case of high dryness, the lubricating oil will accumulate on the inner surface of the injector. The detrimental effect of heat transfer increases

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