2007 Fiscal Year Final Research Report Summary
Investigation of Detonation Initiation by Obstacle Plates Parallel to Flow for Pulse Detonation Engines
| Project/Area Number |
18560759
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Aerospace engineering
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| Research Institution | Hiroshima University |
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Principal Investigator |
ENDO Takuma Hiroshima University, Graduate School of Engineering, Associate Professor (90232991)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Internal Combustion Eneine / Detonation / Initiation / Obstacle |
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| Research Abstract |
The final objective of the research is to develop a new combustor for a pulse detonation engine where we can use air as the oxidizer and easily make the operation frequency high For the objective, we carried out fundamental studios on a combustor whom cross section was a rectangle. The initiation method of detonations is basically obstacle type. However, the obstacles are several plates parallel to the flow direction of the combustor m that the flow resistance of the obstacles is small during the burned-gas-exhaust phase and the gas-recharge phase.
In the research, we mainly optimized the shape and configuration of the obstacle plates. Especially, the generation and propagation of shack waves and the acceleration of flames were investigated in detail with many pressure transducers and ion probes. In the experiments, we used hydrogen-oxygen-argon gas mixtures and hydrogen-air gas mixture, where the equivalence ratio was kept unity. It was found that the intense acceleration of flames and subsequent deflagration-to-detonation transition occurred in the vicinity of the side wall of the combustor. The separation distance and cross-sectional shape of the obstacle plates were hind to have significant influences on the deflagration-to-detonation transition process After some optimization of the obstacle-plate conditions, we successfully initiated detonations in the hydrogen-air gas mixture.
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Research Products
(4 results)
