8 results about "Combustion kinetics" patented technology

This invention provides a method for predicting the hazard range of oil fires on the water surface based on interface tracking coupled combustion dynamics. The method includes: using a conserved two-dimensional shallow water equation to describe oil film diffusion; spatial discretization using the finite volume method; mitigating frictional rigidity using the Strang splitting method; calculating flux using the Roe scheme; suppressing spurious flow using the Well-Balanced scheme; controlling the time step using CFL conditions; and outputting the oil film thickness hourly. A mass evaporation rate conversion model based on energy balance is constructed to transform the oil film thickness field into a mass evaporation rate field per unit area. The mass evaporation rate field is used as the bottom boundary source term of the fire dynamics model and coupled to the three-dimensional low Mach number Navier-Stokes equations through a volume source term, achieving real-time coupled simulation of oil film transport and fire spread. The combustion dynamics control equations, including the conservation of mass, momentum, energy, and components, are solved. Combined with the radiative transfer equations, the spatiotemporal distributions of the temperature field, thermal radiation flux, and flue gas concentration are calculated to achieve dynamic prediction of the hazard range of oil fires on the water surface.

The present disclosure is directed to a method of operating a combustion system to attenuate combustion dynamics. The method includes flowing, via a compressor section, an overall supply of air to the combustion system; flowing, via a fuel supply system, an overall flow of fuel to the combustion system; flowing, to a first fuel nozzle of the combustion system, a first supply of fuel defining a richer burning fuel-air mixture at the first fuel nozzle; flowing, to a second fuel nozzle of the combustion system, a second supply of fuel defining a leaner burning fuel-air mixture at the second fuel nozzle; and igniting the richer burning fuel-air mixture and the leaner burning fuel-air mixture to produce an overall fuel-air ratio at a combustion chamber of the combustion system.

The invention discloses a low-nitrogen gas combustion system based on flue gas recirculation, which relates to the technical field of gas combustion, and comprises the following steps: detecting the components of gas supplied to a combustor online in real time; based on the real-time data of the fuel gas components, two control parameters are calculated and generated at the same time; adjusting the recirculation flue gas flow according to the flue gas recirculation rate recommendation value, and adjusting the operation parameters according to the activation intensity recommendation value; and mixing the recycled flue gas subjected to activation treatment with fuel gas and combustion-supporting air, and combusting. According to the method, gas components are detected in real time and input into a combustion kinetic model, the optimal flue gas recirculation rate and the plasma activation intensity are synchronously decided, key free radicals are supplemented through activated flue gas, and the contradiction between deep nitrogen reduction and combustion stability in the traditional technology is broken through; through a linkage execution mechanism and an intelligent dynamic mixing distribution strategy, collaborative precise regulation and control of a physical field and a chemical field in the combustion process are achieved.

This invention relates to the field of combustion dynamics technology, and provides a method for modeling the combustion dynamics of nano-aluminum particles based on molecular reaction dynamics. The method includes: S1 constructing a nano-aluminum particle model; S2 establishing an oxidation combustion reaction system; S3 analyzing molecular trajectories; S4 extracting reaction paths; S5 determining gas-phase reaction kinetic parameters; S6 determining surface reaction kinetic parameters; S7 constructing a heterogeneous combustion kinetic mechanism; and S8 verifying and outputting simulation results. This invention directly extracts reaction paths through molecular dynamic trajectories in the reaction force field, reducing the subjectivity of relying entirely on artificially preset elementary reactions. It supplements key gas-phase and surface reaction parameters through quantum chemical calculations and density functional theory calculations, improving the physicochemical basis of the mechanism parameters. By coupling gas-phase and surface reactions into a heterogeneous combustion kinetic mechanism, it more completely describes the structural evolution process of aluminum nanoparticles from melting, rapid oxidation, partial oxidation to equilibrium.

The present application provides a rail transit material combustion smoke density dynamic monitoring method and system, relating to the technical field of rail transit, comprising collecting smoke concentration data of multiple sensors in a combustion test box, using a three-dimensional space interpolation algorithm of adaptive grid refinement for three-dimensional reconstruction, combining material combustion characteristic parameters to construct a combustion kinetics model, fusing high-precision three-dimensional distribution map and the kinetics model, constructing a multi-scale diffusion prediction model based on graph neural network, generating smoke density distribution and diffusion path prediction data at future time, so as to realize accurate monitoring and early warning of rail transit carriage smoke density.

The invention provides a water surface oil fire hazard range prediction method based on interface tracking coupling combustion kinetics, and the method comprises the steps: employing a conservation type two-dimensional shallow water equation to describe oil film diffusion, employing a finite volume method to perform spatial discretization, employing a Strand splitting method to relieve friction rigidity, employing a Roe format to calculate flux, employing a Well-Balanced format to inhibit false flow, and employing a CFL condition to control a time step length. The oil film thickness is output hour by hour; a mass evaporation rate conversion model based on energy balance is constructed, and the oil film thickness field is converted into a unit area mass evaporation rate field; the mass evaporation rate field serves as a bottom boundary source item of the fire dynamic model and is coupled to a three-dimensional low-Mach-number Navier-Stokes equation set in a body source item mode, and real-time coupling simulation of oil film transportation and fire spreading is achieved; and solving a combustion dynamic control equation containing mass, momentum, energy and component conservation, and calculating spatial and temporal distribution of a temperature field, thermal radiation flux and smoke concentration in combination with a radiation transfer equation so as to realize dynamic prediction of the hazard range of the oil fire on the water surface.

This invention relates to a simplified method for combustion mechanisms based on reaction molecular dynamics, belonging to the field of combustion dynamics simulation technology. The method first constructs an ammonia-hydrogen combustion system model using Materials Studio software; secondly, it uses the C / H / O / N potential function and performs multi-condition simulations using LAMMPS software; then, it extracts key reaction pathways and core species through reaction trajectory analysis, and removes secondary species and reactions based on species reaction frequencies, constructing a simplified combustion mechanism model; finally, it verifies and optimizes key parameters such as laminar flame velocity and ignition delay time using Chemkin-Pro software under multiple conditions. This invention overcomes the shortcomings of traditional combustion mechanism simplifications that rely on empirical judgment, revealing the essence of combustion reactions at the atomic scale. While ensuring prediction accuracy, it significantly reduces the computational complexity of the mechanism, providing theoretical support for a deeper understanding of combustion dynamics mechanisms and guidance for the efficient organization and optimization of combustion processes.

This invention discloses a comprehensive analysis method and apparatus for the combustion characteristics of hydrogen-blended natural gas pipelines, relating to the fields of gas transmission and distribution and comprehensive utilization of hydrogen energy. Addressing the lack of a systematic method in existing technologies for simultaneously predicting the calorific value, Wobbe index, and combustion potential of hydrogen-blended natural gas, this invention constructs an integrated computational model encompassing thermodynamics, interchangeability, and combustion kinetics, employing a modular design: it calculates the higher and lower calorific values ​​of the mixed gas using a weighted average method, calculates the Wobbe index based on relative density and internationally accepted definitions, and innovatively quantifies combustion potential using a semi-empirical model; it also cross-compares with national standards such as GB17820, and uses multi-indicator collaborative decision-making to determine the feasibility of the proposed scheme. This invention overcomes the shortcomings of the three-dimensional comprehensive evaluation of hydrogen-blended natural gas, offering accurate calculations, strong compliance, and the ability to rapidly generate hydrogen blending ratio-combustion characteristic maps, providing technical support for the design of hydrogen-blended transportation projects, operational safety assessments, and the formulation of relevant national standards.