TY - JOUR
T1 - Assessment of flash-boiling for pulse detonation engines
AU - Wen, Chih Sheng
AU - Chung, Kung Ming
AU - Lu, Frank K.
AU - Lai, Wei Hsiang
N1 - Funding Information:
The research has been supported by the National Science Council under Grant NSC 100-2221-E-006-105 . The authors are also thankful to the editor and to the reviewers who clearly helped to make this paper better than it was initially.
Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/5
Y1 - 2012/5
N2 - Liquid-fueled pulse detonation engines must complete the process of feeding, mixing, and purging in milliseconds. Such an engine is extremely sensitive to the Sauter mean diameter (SMD - must be less than 10 μm) and particle size distribution of the fuel, requirements which are difficult if impossible for most fuel injectors to achieve. This study selected an injector from a direct injection engine and used the aviation fuel JP-8. Utilizing a wide range of operation pressure and duration time, the injection timing and equivalence ratio could be accurately controlled with good response time. The results of the experiment indicate that an SMD of less than 10 μm can be achieved with a fuel pressure greater than 8 MPa. This condition, however, resulted in an overly long injection penetration. This study further incorporated the concept of flash boiling to derive a smaller SMD. However, this causes carbon deposition to occur due to cracking or thermal reaction. To circumvent this phenomenon, this study established a deoxygenation device to mitigate oxidization, further investigating the influence of heating temperature on the generation of deposition. The results of spray distribution indicated that when the fuel is heated to 100°C, only 6 MPa is necessary for achieving fuel droplet characteristics favorable for detonation. Regarding deoxygenation, the results were most significant in fuel heated to 500°C.
AB - Liquid-fueled pulse detonation engines must complete the process of feeding, mixing, and purging in milliseconds. Such an engine is extremely sensitive to the Sauter mean diameter (SMD - must be less than 10 μm) and particle size distribution of the fuel, requirements which are difficult if impossible for most fuel injectors to achieve. This study selected an injector from a direct injection engine and used the aviation fuel JP-8. Utilizing a wide range of operation pressure and duration time, the injection timing and equivalence ratio could be accurately controlled with good response time. The results of the experiment indicate that an SMD of less than 10 μm can be achieved with a fuel pressure greater than 8 MPa. This condition, however, resulted in an overly long injection penetration. This study further incorporated the concept of flash boiling to derive a smaller SMD. However, this causes carbon deposition to occur due to cracking or thermal reaction. To circumvent this phenomenon, this study established a deoxygenation device to mitigate oxidization, further investigating the influence of heating temperature on the generation of deposition. The results of spray distribution indicated that when the fuel is heated to 100°C, only 6 MPa is necessary for achieving fuel droplet characteristics favorable for detonation. Regarding deoxygenation, the results were most significant in fuel heated to 500°C.
UR - http://www.scopus.com/inward/record.url?scp=84857664802&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84857664802&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatmasstransfer.2012.02.030
DO - 10.1016/j.ijheatmasstransfer.2012.02.030
M3 - Article
AN - SCOPUS:84857664802
VL - 55
SP - 2751
EP - 2760
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
SN - 0017-9310
IS - 11-12
ER -