Abstract
The analysis of in-cylinder combustion temperatures using flame image processing technology is reliable. This method can accurately, intuitively, and in real time obtain the temperature field distribution law of the combustion flame in the cylinder, so we can more deeply understand the characteristics of the combustion process of internal combustion engines. In this paper, a high-speed charge-coupled device (CCD) camera is used to record an in-cylinder combustion image, which is calculated and corrected according to the principle of three primary color temperature measurement, and the temperature field distribution of the combustion flame in the diesel engine cylinder is analyzed in detail. In addition, the temperature of the typical combustion flame images under the open-cycle and closed cycle conditions is compared by the CMS2002 measurement and MATLAB program, respectively. The results show that the accuracy of the MATLAB program is acceptable in general but not entirely acceptable in a few ways.
Highlights
Combustion is a very complex chemical reaction, and the flame’s combustion temperature is an important state parameter that reflects the combustion process
When measuring the temperature distribution in the cylinder, the contact temperature measurement method has a large difference from the actual temperature due to the disturbance of the temperature sensing element to the temperature field, the thermal inertia of the sensor and the limitation of the temperature measurement area
Non-contact methods, such as the optical temperature measurement, have the advantage of a wide measuring range, transient response, and high precision, which have made them widely used in temperature measurement in internal combustion engines
Summary
Combustion is a very complex chemical reaction, and the flame’s combustion temperature is an important state parameter that reflects the combustion process. It is crucial to study the heat generated by combustion and the heat transfer in space, which affects the dynamics, economy, and emissions of internal combustion engines. Stable combustion is of great significance to the current topic of energy conservation and emission reduction. Common methods for measuring the temperature in the cylinder are the contact and non-contact types. When measuring the temperature distribution in the cylinder, the contact temperature measurement method has a large difference from the actual temperature due to the disturbance of the temperature sensing element to the temperature field, the thermal inertia of the sensor and the limitation of the temperature measurement area. Non-contact methods, such as the optical temperature measurement, have the advantage of a wide measuring range, transient response, and high precision, which have made them widely used in temperature measurement in internal combustion engines
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