Effects of hydrogen and initial pressure on flame characteristics and explosion pressure of methane/hydrogen fuels

The ablation properties and thermal conductivity of carbon nanotube (CNT) and carbon fiber (CF)/phenolic composites were evaluated for different filler types and structures It was found that the mechanical and thermal properties of phenolic-polymer matrix composites were improved significantly by the addition of carbon materials as reinforcement The concentrations of CF and CNT reinforcing materials used in this study were 30 vol% and 05 wt%, respectively The thermal conductivity and thermal diffusion of the different composites were observed during ablation testing, using an oxygen–kerosene (1:1) flame torch The thermal conductivity of CF mat/phenolic composites was higher than that of random CF/phenolic composites Both CF mat and CNT/phenolic composites exhibited much better thermal conductivity and ablation properties than did neat phenolic resin The more conductive carbon materials significantly enhanced the heat conduction and dissipation from the flame location, thereby minimizing local thermal damage

Effects of carbon nanotubes and carbon fiber reinforcements on thermal conductivity and ablation properties of carbon/phenolic composites

https://research.aalto.fi/files/31662206/Large_eddy_simulation_of_dual_fuel_ignition.pdf

Large-eddy simulation of dual-fuel ignition: Diesel spray injection into a lean methane-air mixture

To improve the ablation resistance of carbon/carbon composites in cyclic ablation environment, SiC/HfC ceramic coating reinforced by HfC nanowires was prepared. The microstructure, bonding strength, coefficient of thermal expansion and cyclic ablation resistance of the as-prepared coating were investigated. After incorporating HfC nanowires, the bonding strength between inner SiC coating and outer HfC coating was increased. HfC nanowires could relieve the coefficient of thermal expansion mismatch between inner and outer coating and improve the toughness of the outer coating. By introducing HfC nanowires, the coated sample’s cyclic ablation resistance was improved. After cyclic ablation under oxyacetylene flame for 60 s × 3, the mass and linear ablation rates of the coated sample with HfC nanowires were only 0.444 mg/s and −0.767 μm/s, respectively.

Ablation resistance of HfC coating reinforced by HfC nanowires in cyclic ablation environment

Preparation and ablation properties of Hf(Ta)C co-deposition coating for carbon/carbon composites

Detailed numerical simulation of transient mixing and combustion of premixed methane/air mixtures in a pre-chamber/main-chamber system relevant to internal combustion engines

Effect of combustion gas mass flow rate on carbon/carbon composite nozzle ablation in a solid rocket motor

Oxidation kinetics and mechanisms of carbon/carbon composites and their components in water vapour at high temperatures

The invention provides an experiment device for researching the jet atomizing characteristic of a jet nozzle. The experiment device can provide a fuel gas environment similar to a fuel gas-vapor type launch power device, simulate the pressure intensity, the temperature, the speed and other parameters of airflow behind the jet nozzle, provide various test interfaces including a conventional test means and a non-contact test means; and in addition, the experiment device can obtain the jet atomizing characteristic of a jet nozzle for the researches on primary atomizing of cooling water at the outlet of the jet nozzle, secondary atomizing and vaporizing of the cooling water in lateral high-speed flue gas flow, water-vapor two phase flow with phase changes and other complicated flowing processes in the fuel gas-vapor type launch power device used for underwater launch, and provide a theoretical basis for the design of the fuel gas-vapor type launch power device.

Li-na Peng

Papers

Detailed numerical simulation of transient mixing and combustion of premixed methane/air mixtures in a pre-chamber/main-chamber system relevant to internal combustion engines

Effect of combustion gas mass flow rate on carbon/carbon composite nozzle ablation in a solid rocket motor

Oxidation kinetics and mechanisms of carbon/carbon composites and their components in water vapour at high temperatures

Experiment device for researching jet atomizing characteristic of jet nozzle

Oxidation kinetics and mechanisms of four-direction carbon/carbon composites and their components in carbon dioxide at high temperature