Wall-surface-replaceable temperature-controllable wall-impinging liquid film measuring device

Abstract

The invention discloses a wall-surface-replaceable temperature-controllable wall-impingement liquid film measuring device, which comprises a wall-impingement plate, a wall-impingement substrate, a wall-impingement test system platform and a temperature control module, and is characterized in that the wall-impingement substrate is arranged on the wall-impingement test system platform, the wall-impingement substrate is provided with a groove, the shape and size of the groove are matched with those of the wall-impingement plate, and the groove is used for accommodating the wall-impingement plate; the temperature control module comprises a thin film thermocouple, an acquisition card and a water bath, the thin film thermocouple is arranged on the wall-impingement substrate, the acquisition card is connected with the thin film thermocouple and used for measuring the temperature of the wall-impingement substrate, and the water bath is connected with the wall-impingement test system platform and controls the temperature of the wall-impingement substrate through a heat transfer medium. The test wall surface can be efficiently replaced under the condition that laser and a camera are not influenced. According to the application, the circumferentially arranged thermocouples are matched with the high-precision high-frequency acquisition card to monitor and control the wall surface temperature in real time, and the wall collision phenomenon of the wet wall surface can be analyzed.

Description

technical field [0001] The present application relates to a configuration of a wall-impingement liquid film measuring device, in particular to a temperature-controllable wall-impinging liquid film measuring device with replaceable walls. Background technique [0002] In the context of carbon neutrality and carbon peaking, the efficient and clean combustion of engines has attracted more and more attention. During the combustion process in the cylinder, the spray wetted wall has always been one of the main problems in the operation of the engine. During the actual movement of the spray, it is easy to contact with the piston top and the cylinder wall, forming a liquid film that is difficult to volatilize, and the liquid film cannot fully Combustion deteriorates the emission performance of the engine and affects the power output of the car. During the wall collision process, the quantitative measurement of the liquid film on the wall is particularly important for the systematic...

AI Technical Summary

Problems solved by technology

[0003]The problem with the existing technology is that the equipment is complex to build. Once the test platform is built, only a single wall material can be measured. If you want to replace the wall material, you need to rebuild the equipment and re- Carry out calibration experiments, low efficiency and high cost

The material and shape of the piston top and cylinder liner in the actual engine cylinder are complex, and the existing single wall material layout is difficult to meet the actual research needs

Although in the prior art, wall replacements with different roughnesses are used to study walls with different roughnesses, in actual optical testing experiments, replacement of walls not only requires recalibration to affect efficiency, but also causes changes in the observation area. The camera is adjusted twice to further reduce the efficiency of the experiment, and the comparability between experiments will also be greatly reduced

[0004]In addition, the current test platform is difficult to accurately control the wall temperature, the current wall temperature is obtained through calibration experiments, by measuring the temperature of the coolant flowing through the wall-impacting platform and Wall temperature, draw the calibration curve, during the experiment, it is considered that the wall temperature and the calibration liquid temperature are in one-to-one correspondence and remain unchanged

Many similar existing technologies have adopted this method for calibration, but in the actual experiment process, the change of the flow field caused by the spray and the flow of the liquid film on the wall will affect the wall temperature, and the wall temperature will impact the wall. The physical process is particularly important, and the imprecise wall temperature will have a great impact on the subsequent analysis

If the operation of replacing the wall surface is also involved, the complexity of the calibration work will be further increased, and the time-consuming experiment will be further increased.

Images