Analysis Of Turbulent Combustion Flame Based On Constant Volume Combustion Chamber

As the energy shortage and environmental contamination deteriorate, implementing turbulent combustion of gas fuel properly is important to obtain combustion control, improve the engine power output and fuel consumption. Therefore it is necessary to study turbulent flame combustion which can provide theoretical guidance for the engine development.In this paper, an experimental platform of turbulent constant volume combustion is designed. The author developed turbulent the fuel-gas supply system. It contains injection valve, turbulent jet device, premixed gas box, premixed gas mix device. A system for controlling ignition and injection is designed for this experimental platform. It achieves parameters’control such as the injection time and the energy of the ignition and ignition delay control. The temperature acquisition system is developed in the paper which can achieve the analysis of temperature data, date save and real-time display.It studies the variable parameter turbulent combustion in the turbulent combustion experimental platform. The experiment results show: Increase turbulent properly able to speed up burning process of flammable gas. Compared with the laminar burning, turbulent combustion flame spread faster, development of fire core faster. In the early time of fire core, the development of turbulence fire core present an accelerate process. In the turbulent combustion process, the greater the initial pressure will cause the biggest breakout pressure of turbulent combustion bigger. Along with the ignition delay, the time of combustion which pressure increase to the maximum will longer. Along with the increase of equivalent, the size of fire core at the same time first increases and then decreases. It reaches biggest In the equivalent of1.0. With the increase of the proportion of the nitrogen, burning speed has a significantly decrease, rate of increasing pressure reduces, temperature of combustion reduces and the process of turbulence fire core’s forming becomes slow. Different jet aperture makes different turbulent combustion pressure, and when jet aperture is2.5mm, it has faster speed of turbulent combustion.