Fundamental Study on the Radical Ignition Technique Using Constant Volume Chamber (CVC)

摘要

A previous fundamental study was executed using a constant volume chamber (CVC) to improve the burning characteristics of lean pre-mixture by the injection of active radicals generated in the sub-chamber of the CVC. The Radical ignition (RI) technique shows remarkable progress in the burning velocity and combustible lean limit compared with spark ignition (SI) technique. And the optimum design value of the sub-chamber geometry is near 0.11 cm{sup}(-1) in the ratio of total area of holes to the sub-chamber volume (A{sub}h/V{sub}s). In this study, based on the previous experimental study, the additional works have been performed to examine the effects of geometry change in the number (N{sub}h), the total section area (A{sub}h), and diameter (D{sub}h) of the passage holes on the combustion characteristics in the CVC. A single frame ICCD camera was used for the measurement of CH and C{sub}2 radical distribution in the combustion chamber. Also, ambient conditions such as the initial temperature and the initial pressure of mixture were selected as experimental parameters. As a result, the correlation between passage hole number and overall passage hole area was grasped. The effects of initial temperature were significant, but on the other hand, those of initial pressure were weak.