Comprehensive numerical investigations on the thermal performance of heat recirculating micro combustor with pin fins for micro-thermal voltaic system applications

You, Jingxiang; Yan, Yunfei; He, Ziqiang; Xue, Zongguo; Zhang, Chenghua; Chen, Yanrong

doi:10.1016/j.ijhydene.2022.08.294

Cited by 10 publications

(1 citation statement)

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“…The 17 Sustainable Development Goals (SDGs) outlined for 2030 emphasize the importance of improving the performances of microthermal energy conversion devices [1]. Combustion-based microdevices have revolutionized the field of energy conversion in the past 30 years due to their high energy density, low weight, compact size, and long lifespan [2][3][4][5][6][7][8][9]. These devices not only offer energy benefits but also have significant economic and social implications.…”

Section: Introduction 1backgroundmentioning

confidence: 99%

Toward Zero Carbon Emissions: Investigating the Combustion Performance of Shaped Microcombustors Using H2/Air and NH3/Air Mixtures

Cinieri,

Shah,

Marseglia

et al. 2023

Aerospace

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The research effort in the microcombustor field has recently increased due to the demand for high-performance systems in microelectromechanical and micro power generation devices. To address rising concerns about pollutants from fossil sources, zero-carbon fuels such as hydrogen (H2) and ammonia (NH3) have been considered as an alternative in microcombustion processes. In a microcombustor, the surface area-to-volume ratio is much higher compared to conventional combustion systems, resulting in faster heat transfer rates and more intense combustion reactions. However, achieving efficient mixing of fuel and an oxidizer in a microcombustor can be challenging due to its small size, particularly for highly reactive fuels like H2. For NH3, challenges in microcombustion involve a low reactive, high ignition temperature (923 K vs. 793 K of H2) and high concentration of NOx combustion products. Therefore, studying the performance of these fuels in microcombustors is important for developing clean energy technologies. In this paper, to explore features of non-premixed NH3/air and H2/air combustion in micro-scale combustors, an Ansys Fluent numerical investigation was conducted on a Y-shaped microcombustor. Results show that for combustion with H2, stationary flames can be achieved even at lower equivalence ratios. Additionally, the pollutants generated from H2 in the flame are generally twice those of NH3. The overall efficiency of the microcombustor is two times greater for NH3 conditions than for H2 conditions.

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