분무연료의 상태가 임계 상태의 분무연료(C₃H_8)를 분무연료의 임계압력과 같은 압력을 유지하며 온도는 상온인 294 K을 갖는 주위가스 (N₂, CO₂, He)에 분사하여 분무분열 형태와 분무각를 시뮬레이션하였다. Pc=1, Tr=0.9인 아임계상태의 시뮬레이션 결과는 기존 분사영역과 같이 액체분사 형태를 유지하나 Pc=1, Tr=1인 임계 상태에서는 온도...
분무연료의 상태가 임계 상태의 분무연료(C₃H_8)를 분무연료의 임계압력과 같은 압력을 유지하며 온도는 상온인 294 K을 갖는 주위가스 (N₂, CO₂, He)에 분사하여 분무분열 형태와 분무각를 시뮬레이션하였다. Pc=1, Tr=0.9인 아임계상태의 시뮬레이션 결과는 기존 분사영역과 같이 액체분사 형태를 유지하나 Pc=1, Tr=1인 임계 상태에서는 온도변화에 따라 밀도가 급격하게 변하기 때문에 분무형태가 액체분사에서 기체분사 형태로 변화한다. 그러므로 아임계상태 분사보다는 임계상태 분사의 경우 분무각이 커지며 분무길이는 짧아진다. 이는 임계 분사의 연소기의 크기를 줄일수 있음을 보여준다. 또한 주위가스의 밀도비 ρ_r = ρ_f/ρ_g가 증가할수록 분무각은 감소하며, 분무길이가 길어지고 분무유량을 36㎖/min에서 360㎖/min으로 증가시키면 이 Rayleigh영역에서 wind-induced 영역으로 변화하므로 분무길이가 길어지고 분무각이 작아진다.
분무연료의 상태가 임계 상태의 분무연료(C₃H_8)를 분무연료의 임계압력과 같은 압력을 유지하며 온도는 상온인 294 K을 갖는 주위가스 (N₂, CO₂, He)에 분사하여 분무분열 형태와 분무각를 시뮬레이션하였다. Pc=1, Tr=0.9인 아임계상태의 시뮬레이션 결과는 기존 분사영역과 같이 액체분사 형태를 유지하나 Pc=1, Tr=1인 임계 상태에서는 온도변화에 따라 밀도가 급격하게 변하기 때문에 분무형태가 액체분사에서 기체분사 형태로 변화한다. 그러므로 아임계상태 분사보다는 임계상태 분사의 경우 분무각이 커지며 분무길이는 짧아진다. 이는 임계 분사의 연소기의 크기를 줄일수 있음을 보여준다. 또한 주위가스의 밀도비 ρ_r = ρ_f/ρ_g가 증가할수록 분무각은 감소하며, 분무길이가 길어지고 분무유량을 36㎖/min에서 360㎖/min으로 증가시키면 이 Rayleigh영역에서 wind-induced 영역으로 변화하므로 분무길이가 길어지고 분무각이 작아진다.
The purpose of the study is to investigate the flow characteristics in the critical spray conditions. The C_3H_8 was used as the fuel and it was injected into dissimilar gases at critical pressure and subcritical temperature of the injected fluid. The gases in the surrounding were N2, CO2 and He. In...
The purpose of the study is to investigate the flow characteristics in the critical spray conditions. The C_3H_8 was used as the fuel and it was injected into dissimilar gases at critical pressure and subcritical temperature of the injected fluid. The gases in the surrounding were N2, CO2 and He. In the conditions of this analysis, the flow region was changed from Rayleigh region to wind-induced region when the volume flow rate is varied from 36 ml/min to 360 ml/min. The thermodynamic state of the fuel injected was varied from sub critical state(Pr=1, Tr=0.9) to critical state(Pr=1, Tr=1). The analysis of study was conducted using a packaged program, called "CFD-AC + " (CFD Research Corporation) which incorporates a finite difference scheme and a k-ε turbulence model. The results shows that the length of spray is increased with increasing the volume flow rate, but the spray angle is decreased with it. The flow condition is changed from sub critical state to critical condition, so that the spray mode is changed from liquid injection mode to gas injection mode because of varying density of fuel rapidly with temperature. When the spray length in the critical spray is compared with that in the subcritical spray, it is decreased and the results indicate that the length of the furnace could be decreased. The spray angle also is decreased with the increase of the ratio of density(ρ_f/ρ_g).
The purpose of the study is to investigate the flow characteristics in the critical spray conditions. The C_3H_8 was used as the fuel and it was injected into dissimilar gases at critical pressure and subcritical temperature of the injected fluid. The gases in the surrounding were N2, CO2 and He. In the conditions of this analysis, the flow region was changed from Rayleigh region to wind-induced region when the volume flow rate is varied from 36 ml/min to 360 ml/min. The thermodynamic state of the fuel injected was varied from sub critical state(Pr=1, Tr=0.9) to critical state(Pr=1, Tr=1). The analysis of study was conducted using a packaged program, called "CFD-AC + " (CFD Research Corporation) which incorporates a finite difference scheme and a k-ε turbulence model. The results shows that the length of spray is increased with increasing the volume flow rate, but the spray angle is decreased with it. The flow condition is changed from sub critical state to critical condition, so that the spray mode is changed from liquid injection mode to gas injection mode because of varying density of fuel rapidly with temperature. When the spray length in the critical spray is compared with that in the subcritical spray, it is decreased and the results indicate that the length of the furnace could be decreased. The spray angle also is decreased with the increase of the ratio of density(ρ_f/ρ_g).
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