Device for measuring knocking combustion pressure in millimeter-level circular tube

Abstract

The invention provides a device for measuring knocking combustion pressure in a millimeter-level circular tube. The device comprises a knocking tube, a clamping plate, a sensor mounting seat and a sensor. The clamping plate fixes and supports the front side of the knocking plate. The sensor mounting seat is arranged at the position where a flame forms knockings. A through hole is formed in a tube wall, and the through hole in the tube wall and a sensor mounting hole in the sensor mounting seat are coaxial. When the outer diameter of the knocking tube is larger than the diameter of the measuring end of the sensor, the hole diameter of the through hole in the tube wall is equal to the diameter of the measuring end of the sensor, and the measuring end face of the sensor is flush with the inner wall of the knocking tube. When the outer diameter of the knocking tube is not larger than the diameter of the measuring end of the sensor, the hole diameter of the through hole in the tube wall is smaller than the diameter of the measuring end of the sensor, and the measuring end face of the sensor is tangent to the circular face of the inner wall of the transparent knocking tube. The knocking tube, the clamping plate and the sensor mounting seat in the device are all made of organic glass, pressure can be measured, and a flame propagation mode can be observed and flame speed can be measured simultaneously. Meanwhile, the function of insulation can be achieved, and the interference of electric sparks is avoided.

Description

technical field [0001] The invention relates to the field of combustion pressure measurement, in particular to a device for measuring the detonation combustion pressure in a millimeter-scale circular tube. Background technique [0002] Micro-scale detonation combustion refers to the detonation combustion with a burner size of millimeter or submillimeter level. It belongs to the intersection of conventional scale detonation combustion and micro-nano science. It is an emerging research direction abroad in recent years. Research. Because the mechanism of detonation combustion itself is very complicated, if the combustion size becomes small, it will inevitably change the combustion speed, pressure, DDT distance, etc., and whether these changes are better than conventional scale combustion, and whether they can be used for micro-power propulsion system, is the researcher's concern. [0003] At present, the research on micro-scale detonation combustion mainly starts from the com...

AI Technical Summary

Problems solved by technology

The disadvantage of these methods is that some avoid the difficulty of pressure measurement, and some only solve the problem of pressure measurement, ignoring the correlation between pressure measurement and measurement of other parameters, making the experiment incomplete

For example, micro-scale detonation experiments often need to observe the flame propagation mode and velocity changes, which requires the experimental carrier (such as the detonation tube) to be fully or partially transparent, and at the same time, it is necessary to ensure that the material is strong enough; moreover, when using In the case of spark ignition, if the detonation tube is made of stainless steel, not only the flame cannot be observed, but also it is easy to cause ignition failure or interfere with the sensor due to the conductivity of stainless steel

It can be seen that if these factors are also considered while measuring the pressure, the difficulty of the experiment will increase, and there is no solution in the literature at home and abroad.

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