Study Of Flame Characteristics About Low Calorific Value Gas Mixing Hydrogen Based On Constant Volume Combustion Chamber

As the shortage of energy and environment worsening, research on clean energy gradually becomes a hot research topic in the field of engine. Low calorific value gas such as methane gas, coal-bed methane is considered one of the more promising clean fuels. Compared with natural gas, hydrogen has fast flame propagation speed, a wide range of combustible, low ignition energy, no carbon pollutants in exhaust etc. Therefore, low calorific value gas mixing hydrogen becomes a hotspot in the research of the engine.This paper designed heating and temperature control system on Constant Volume Combustion Chamber and completed the overall building, installation and performance testing for this system. Using LabVIEW platform I developed the design of test monitoring system and completed gas jet turbulence intensity measurement. Data processing of gas velocity and turbulence intensity at different pressure, different location was finished. I summarized the influence law of pressure and position about turbulence intensity. Results show that with the increasing pressure, gas velocity and turbulence intensity rise. And the more close to the jet device, the bigger turbulence intensity is. But the influence of position is less than the influence of pressure.The paper studied the variable parameter combustion at different volume ratio, mixing ratio and the initial pressure, initial temperature. The results showed that with pressure increasing, stretching flame propagation rate decreased and temperature increasing can let the flame propagation speed significantly increase. But the stability of the flame is not sensitive to the temperature. With the increasing of hydrogen mixing ratio, the stability of the flame decrease and the combustion will be more intense. Also burning dilute limit is expanded. Incomplete combustion will happen near the dilute limit and combustion rate is very slow right now. The flame is under the effect of buoyancy and burning center shift. Mixing other inert gases make the flame propagation speed reduce.