저압 조건에서 흡열연료의 점화지연시간에 미치는 열분해 생성물의 효과
Effects of Pyrolysis Products on Ignition Delay Time of an Endothermic Fuel at Low Pressure
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An endothermic fuel can be used as a coolant flowing through a cooling channel to prevent a combustor wall from being heated as it absorbs additional heat through its endothermic reaction in addition to sensible heat absorption. Experiments and numerical simulations were conducted to analyze the ignition characteristics of a pyrolyzed fuel after it is injected into the combustion chamber. For this purpose, ignition delay time of the endothermic fuel, called TF-10, was measured at pressures close to operating conditions in a supersonic propulsion system, by using a constant-volume combustion chamber(CRU) and a shock tube. And, effects of pyrolysis products on ignition characteristics were also evaluated. TF-10 was found to exhibit greater pressure dependency and longer ignition delay times than Jet-A1. Among the pyrolysis products, ethylene(C2H4) was identified as a key species promoting ignition of TF-10. From sensitivity analyses, it is found that the specific reactions steps contribute to ignition acceleration of the mixture of TF-10 and ethylene.
Abstract
An endothermic fuel can be used as a coolant flowing through a cooling channel to prevent a combustor wall from being heated as it absorbs additional heat through its endothermic reaction in addition to sensible heat absorption. Experiments and numerical simulations were conducted to analyze the ignition characteristics of a pyrolyzed fuel after it is injected into the combustion chamber. For this purpose, ignition delay time of the endothermic fuel, called TF-10, was measured at pressures close to operating conditions in a supersonic propulsion system, by using a constant-volume combustion chamber(CRU) and a shock tube. And, effects of pyrolysis products on ignition characteristics were also evaluated. TF-10 was found to exhibit greater pressure dependency and longer ignition delay times than Jet-A1. Among the pyrolysis products, ethylene(C2H4) was identified as a key species promoting ignition of TF-10. From sensitivity analyses, it is found that the specific reactions steps contribute to ignition acceleration of the mixture of TF-10 and ethylene.