Abstract
In order to investigate the effects of the diameter of cylindrical section on the solid fuel scramjet combustor performance and the flowfield characteristics, based on a solid fuel scramjet experimental data, the numerical investigations concerning about the characteristics of the flow field in the solid fuel scramjet and the combustor performance are carried out when the diameter of the cylindrical section is changed. A second-order-upwind difference scheme and the pressure based solver were used for simulating the dynamic flow associated with an axis symmetric physical model. The combustion model in the numerical simulations was Finite-Rate/Eddy-Dissipation and the turbulence model was the SST k-ω model. The boundary of PMMA solid fuel was defined as the user defined function way. The numerical simulation results indicate that with the increasing of the diameter of the cylindrical section, until the cylindrical section is open, the combustor will not be choked and the mainstream in the combustor becomes supersonic. In certain size of the cylindrical section diameter (about dcyl=16.5 mm), the outlet of the combustor is optimum-expansion. Generally, as the diameter of the cylindrical section increases, the combustion efficiency increases from 62.45% to 72.74% at outlet, while the total pressure loss also increases, which gets an maximum value of 52% at outlet in certain model, and the combustor thrust decreases.
Original language | English |
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Pages (from-to) | 884-892 |
Number of pages | 9 |
Journal | Tuijin Jishu/Journal of Propulsion Technology |
Volume | 36 |
Issue number | 6 |
DOIs | |
Publication status | Published - 1 Jun 2015 |
Keywords
- Combustion efficiency
- Combustor thrust
- Flow field characteristics
- Numerical simulation
- Solid fuel scramjet
- Total pressure loss