Abstract
A new technic to measure the propagating flame precisely by using densely installed multiple ion-probes has been developed. This system targets the high-intensity and pulsatile combustion, including knocking in gasoline engine, and oscillating combustion in burner or gas turbine combustor. In such environment, observation of details in the combustor by visualization is generally limited because of the strength of observation window. In contrast, ion-probe is physically and thermally strong enough to endure such environment. In the present paper, characteristic features of this measurement technic were investigated by the series of basic tests for measuring the different types of propagating flame with LPG- oxygen-nitrogen mixture. The result shows that this measurement technic has an ability to capture the fluctuation of propagating velocity both in deflagration propagating at a few meters per second and in detonation propagating at supersonic speed with a few kilo meters per second. It is expected that this technic has sufficient performance to capture precisely the knocking in automotive engines and oscillating combustion in burners.
