DADOREN: Direct numerical simulations And Data-driven analysis Of ignition and combustion in Realistic pre-chamber/ Engine systems with NH3/H2 blend fuel

为了促进实际发动机系统的无碳低排放燃烧，本项目研究了在真实的预燃室/发动机几何结构中使用NH3/H2混合燃料的瞬时点火和湍流燃烧过程。在超级计算机上用艾级计算对该系统进行了直接数值模拟，产生了大量的高保真数据。将机器学习技术应用于化学动力学的加速计算中。真实感几何图形用浸没边界方法表示。通过数据驱动分析，详细研究了湍流火焰的着火特性和多尺度特性。还对NOx排放进行了调查。对实际使用NH3/H2燃料的预燃室/发动机系统有了更好的了解，这对基础学术研究和实际应用都是有帮助的。

To facilitate carbon-free and low emission combustion in practical engine systems, this project investigates the transient ignition and turbulent combustion process in a realistic pre-chamber/engine geometry with NH3/H2 blend fuel. Direct numerical simulations (DNS) are carried out for this system with exascale computation on Supercomputers, generating a vast amount of high-fidelity data. Machine learning techniques are applied to accelerate the chemical kinetic computation in DNS. The realistic geometry is represented by the immersed boundary method. Data-driven analysis is done to investigate in detail the ignition characteristics and the multi-scale features of the turbulent flames. NOx emissions are also investigated. A better understanding of the practical pre-chamber/engine system using NH3/H2 fuel should be finally obtained, which would be useful for both fundamental academic research and practical applications.