研究目的
Investigating the effects of geometric parameters on the combustion and thermal performance of a swirl micro-combustor for micro thermophotovoltaic systems.
研究成果
The study concludes that the geometric parameters significantly affect the combustion and thermal performance of the swirl micro-combustor. The inner recirculation zone and corner recirculation zone are critical for flame stability. The swirler width (w2) and step height (w3) have notable effects on heat transfer and temperature uniformity, while the center inlet radius (w1) has a minimal impact. The optimized micro-combustor design shows improved thermal performance and energy output for micro thermophotovoltaic applications.
研究不足
The study is limited to numerical simulations and does not include experimental validation for all cases. The effects of radiation are not considered due to the small size of the combustor, which may not capture all heat transfer mechanisms.
1：Experimental Design and Method Selection:
A three-dimensional numerical model is developed using ANSYS Fluent 15.0 with a detailed hydrogen/air reaction mechanism. The realizable k-ε turbulence model is adopted to simulate the micro flow. The combustion process utilizes a detailed chemical reaction mechanism, and the eddy dissipation conception model is used to compute the turbulence-chemistry interaction.
2：0 with a detailed hydrogen/air reaction mechanism. The realizable k-ε turbulence model is adopted to simulate the micro flow. The combustion process utilizes a detailed chemical reaction mechanism, and the eddy dissipation conception model is used to compute the turbulence-chemistry interaction.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The study focuses on a premixed hydrogen/air flame in a swirl micro-combustor. The geometric parameters varied are the center inlet radius (w1), swirler width (w2), and step height (w3).
3：3).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The combustor is made of silicon carbide (SiC), with density, thermal conductivity, and specific heat of 3217 kg/m3, 32.8 W/m$K, and 2352 J/kg$K, respectively.
4：8 W/m$K, and 2352 J/kg$K, respectively.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The study involves numerical simulations to investigate the effects of varying geometric parameters on the combustion and thermal performance of the micro-combustor. The boundary conditions include a premixed H2/air mixture at 300 K with uniform velocity and species distribution at the inlet, and a pressure-outlet boundary condition at the outlet.
5：Data Analysis Methods:
The results are analyzed in terms of temperature distributions, combustion efficiency, and thermal performance metrics such as mean wall temperature and temperature uniformity.
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