Method for measuring pressure of hydrodynamic force contact area by using quantum dots

Abstract

A method for measuring the pressure of a hydrodynamic force contact area by using quantum dots comprises the following steps: (1) performing different pressure calibration on a quantum dot solution to obtain a quantum dot photoluminescence energy-pressure calibration curve; and (2) adding the prepared quantum dot solution as a lubricating fluid into a lubricating area, forming a fluid film doped with quantum dots in an elastohydrodynamic lubricating contact area, calculating photoluminescence energy of spectral information by using a laser as an excitation light source, and comparing the photoluminescence energy with a quantum dot photoluminescence energy-pressure calibration curve to obtain fluid dynamic contact area pressure to realize the real-time measuring of the contact area fluid film pressure. The method has the advantages of high universality, good stability, non-contact type and the like; and an innovative thought and method are provided for hydrodynamic contact area monitoring, and meanwhile, necessary technical reference is provided for pressure monitoring in the field of fluid lubrication of major equipment.

Description

technical field [0001] The invention relates to the technical field of fluid lubrication, in particular to a method for measuring the pressure in a fluid dynamic contact zone by using quantum dots. Background technique [0002] Fluid lubrication is widely used in aerospace, automobile and other fields. Minimizing the friction and heat dissipation in the lubrication process is of great significance to realize the high-speed operation of equipment for a longer period of time. The rheological behavior and friction response of the fluid inside the lubrication are directly related to the local pressure and temperature at each point in the contact area. Therefore, an accurate understanding of the pressure in the hydrodynamic contact on a spatial scale compatible with the contact size is very important for analyzing the fluid lubrication process. It is of great significance to realize the high-speed operation of the equipment. [0003] At present, with the development of various d...

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Problems solved by technology

However, the thickness of this type of sensor is not negligible for the thickness of the fluid in the contact area, which has a certain degree of intrusion, and the sensor structure is fragile and prone to damage under high shear stress

In the field of non-contact testing technology, Raman spectroscopy is used to measure the pressure distribution, which realizes the non-contact measurement of the pressure in the fluid dynamic contact area, and avoids the impact on the fluid form and equipment structure, but at the actual level, the The signal-to-noise ratio of the technology is extremely low, and the detected fluid must be a strong Raman scatterer, which limits the engineering application of the technology

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