反射衝撃波による非定常水素噴流の着火に関する実験

概要

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This paper describes an experimental study of the ignition of unsteady hydrogen jets injected into compressed high temperature air behind reflected shock waves. Hydrogen gas was injected into the test section 8.5~11. ms before incident shock wave was reflected from the end plate. Pressure measurements as well as the detection of light emission due to combustion of a hydrogen-oxygen gas mixture were made by the use of photomultiplier and pressure gages. We found : (1) The ignition delay times observed under the temperature ranging between 800 to 1600 K were from 0.5 to 15 ms ; (2) There exist ignition limits similar to the results of the experiments with premixed gases. However we did not find any clear "explosion-peninsula" ; (3) The Ignition delay time of unsteady hydrogen jets compressed by means of a shock tube was longer than the premixed one, because the hydrogen jets need some time to mix with air ; (4) When much hydrogen which was cooled by adiabatic expansion spurted into the low density test density test section, it caused the temperature of the air in the test section to fall, and the ignition delay time to become long.
社団法人日本機械学会の論文
1986-02-25