Numerical investigation on the performance of bluff body augmented micro cavity-combustor
| Autor: | Kun Wu, Wei Yao, Zheng Zhang, Richard K.K. Yuen, Jian Wang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Convection
geography geography.geographical_feature_category Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology 02 engineering and technology Mechanics 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Inlet Combustion 01 natural sciences 0104 chemical sciences Fin (extended surface) Reaction rate Damköhler numbers Fuel Technology Bluff Combustor 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 45:4932-4945 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2019.12.004 |
| Popis: | Bluff body augmented micro-cavity combustors are proposed in this study to enhance the combustion efficiency under high inlet velocities. The original and two types of bluff body supplemented micro cavity combustors, namely CAVITY, TRIANGLE, and FIN combustors are numerically investigated. The results show that the combustion efficiency ( η c ) of bluff body augmented combustors are higher than that of the CAVITY combustor, and the largest increment of 10.8% is obtained in the FIN combustor. The underlying mechanisms for the improvement in η c of the FIN and TRIANGLE combustors have been analyzed. It is demonstrated that the altered flow field structures and transvers reactant transport induced by the bluff body play dominant roles. Moreover, the local Damkohler number ( D a L ) is introduced, which is defined as the ratio of the local hydrogen reaction rate and the convective mass transport rate. The variation of η c along the streamwise direction in the proposed combustors is determined by the value of D a L . |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect