@article{oai:jaxa.repo.nii.ac.jp:00031828,
 author = {倉谷, 健治 and 坂井, 卓爾 and KURATANI, Kenji and SAKAI, Takkuji},
 issue = {2_B},
 journal = {東京大学宇宙航空研究所報告},
 month = {Jun},
 note = {Throughout the static firing tests, measurements and analyses of the oscillatory combustion have been studied most carefully, with the use of various pressure indicators and a playback system of the recorded signal. We have experienced some cases of heavy pressure oscillations. These cases are classified into two groups. In one of them, an abrupt pressure rise is triggered by a small pressure spike occured just ahead of the pressure increase. This small spike may be due to the plugging of the nozzle throat by burnt fragments of cellulose acetate used for a cylindrical igniter case. To avoid this fault, in the later stage of our experiments, the cylindrical igniter was replaced by a cage igniter. On the other hand, the sudden pressure rise of the latter type is occured in the tailoff period, and the pressure level at which instabilities build up is lower than the maximum pressure. From the concept of the existence of the upper limit of the combustion pressure under which engines burn normally, this phenomenon cannot be easily explained, and the following view is proposed. By the severe erosion at the nozzle end, the propellant around the nozzle end was completely burnt out in a relatively early period and the inner surface of an engine cylinder near the nozzle end was exposed to the combustion gas. This causes the rapid decrease of the propellant surface and the visco-elastic damping effect by propellant itself becomes smaller compared to the amplifying effect of the combustion surface. When some disturbances are applied to this circumstance, acoustic oscillation will be excited and amplified to the fatal strength. But, both types of sudden pressure increase are in common with respect to their attendance with the fundamental longitudinal vibrational mode. The other remarkable anomaly of the combustion of our engine is its severe erosion. To know the more detail of the erosion, the comparison between the observed times of the beginning of tailoff and the calculated values assuming the mass flow density erosion and the velocity erosion is carried out. The erosion directly observed in a grain interrupted after burning for a short period is also explained with the same assumption., 資料番号: SA0124883000},
 pages = {654--671},
 title = {II.2.2 異常燃焼について(2 エンジン)(II.関連研究)},
 volume = {2},
 year = {1966}
}