Structural Design And Analysis For Combustion Diagnosis Subsystem Of Combustion Science Experimental System For Space Station

Energy utilization and power acquisition can be realized by combustion process.But fire,explosion and pollution caused by uncontrolled combustion also cause great trouble to human beings.Therefore,it is important to improve the ability to predict and control combustion phenomena.The microgravity environment,an ideal environment for combustion science research,can simplify the combustion model and provide a way to test the classical combustion theory and explore the unknown combustion phenomena of human beings.China plans to build a large manned space station around 2022.The Combustion Science Experimental System is a comprehensive platform for microgravity combustion experiment research,which will be operated by astronauts in orbit in the China Space Station.The Combustion Diagnosis Subsystem of Combustion Science Experimental System can obtain information that reflects combustion characteristics such as flame structure,temperature field,velocity field,carbon and smoke concentration field,and spectral characteristics of intermediate components through non-contact measurement means.In this paper,the structure design and analysis of the Combustion Diagnosis Subsystem are carried out based on the basic principles of various combustion diagnostic techniques and design specifications.First,The Combustion Diagnostic Subsystem consists of 4 measurement units.The measurement principle of continuous collimated optical unit etc.is analyzed.The functional implementation feasibility of each unit was evaluated in conjunction with the spatial layout on the Optical Support Plate of the diagnostic equipment contained in each unit.Prior to the structural design,experiments are required to verify whether the continuous laser can be applied to flame velocity field measurements.Then,cold state experiments and combustion state experiments were designed.According to the comparative analysis of the experimental results based on a doublepulse laser PIV system and a continuous laser TR PIV system,it is demonstrated that the measurement results of the continuous laser PIV system are close to those of the double-pulse laser PIV system with some accuracy when the low velocity flow field was measured.In addition,it is also known that the continuous laser PIV system is more sensitive to parameters such as tracer particle size and spreading concentration.Finally,the laser and cameras were selected.The optical diagnostic equipment using the same camera was normalized.Based on the design specifications,the calculation of lens parameters and detailed structure design of the high-speed camera module,enhanced camera module and collimated light source module were carried out using the modular design idea.After the design was completed,the measurement error and mechanical environment adaptability of the designed structure were evaluated through error analysis and dynamics simulation analysis,which proved that the structure design was reasonable and reliable.