Construction of simulation experiments for gas combustion and smoke emission using Unity 3D
[Objective]The advancement of coal resource exploitation in deep coal seams has increasingly highlighted the issue of gas control,posing higher requirements for the cultivation of high-quality,composite,and outstanding talents.Practical teaching is an important process for achieving teaching and training goals because it can cultivate high-quality,innovative talents.However,owing to the flammable and explosive gases involved,traditional practical teaching of gas combustion and utilization is restricted by high safety risks and simple teaching methods,which makes it difficult to cultivate students'practical engineering abilities.To address these problems,a virtual simulation experimental system for ultra-low-concentration gas combustion and smoke emission component detection is constructed based on Unity 3D.[Methods]A simulation system is constructed according to the experimental scenarios of gas combustion and utilization based on a gas turbine and an infrared flue gas analyzer produced by Capstone.First,the knowledge architecture and teaching objectives of experimental teaching are reconstructed according to cutting-edge scientific research achievements and engineering technology application cases of low-concentration gas combustion and utilization.Subsequently,a five-layer architecture for the virtual simulation software system is designed according to the teaching requirements of virtual simulation experiments for gas turbines.As the experiment of gas combustion and smoke emission includes both physical models and unstable processes,it requires different strategies for modeling.For physical devices in the solid state,the experimental setup is divided into eight modules,and each device of the submodules is built in Blender.For transient,unstable processes,such as flame propagation,a virtual reality method for the three-dimensional dynamic display of transient structures driven by reconstruction data of the temperature field is proposed.Finally,according to the functional attributes of the physical apparatus,specific physical parameters and behavior rules are assigned to the corresponding virtual models to simulate the functions of the equipment and the processes of the experiments.[Results]The virtual simulation experimental platform consists of five stages:combustion scheme setting,methane filling,gas premixing,flame observation,and smoke component detection.After completing theoretical learning and virtual security training,users can perform experimental operations on a virtual simulation platform.By clicking the corresponding button,users can browse the experimental principles,operating steps,and safety tips for this experiment.To improve the users'level of safety operation,the system allows panoramic observation before conducting experiments and sends safety reminders in case of emergency.The results and practical skills involved in the experiments are evaluated through a combination of process evaluation and summative assessment.The virtual system enables dynamic interactive operation and experiment simulation.The system also provides training methods with high fidelity,strong immersion,and high safety for experimental teaching.[Conclusions]The virtual simulation experimental platform offers a safe operating environment with highly realistic scenes and effective human-computer interaction.The application of this virtual simulation system in experimental teaching significantly enhances students'understanding of experimental principles.Teaching practice shows that the project expands the learning space and cognitive scope of users,creating a scenically rich,interactive,experiential,and integrated teaching mode that benefits the cultivation of college students.
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