| Combustion is the main means for human beings to obtain energy,power and generate thrust,so it is important to deepen the understanding of the phenomenon of combustion.The effect of gravity on combustion is obvious.Deepening research on combustion phenomena in microgravity or low-gravity environments can help to improve the ability of humans to predict and prevent fires,which is also a practical need for fire prevention and fire extinguishing projects in manned spaceflight practice.At present,most microgravity combustion experiments are carried out through ground experimental facilities,so they are limited by the time and level of microgravity.The space station provides a perfect microgravity environment for these experiments.Around 2022,China's manned space station will be built to support large-scale and multidisciplinary space science research.Microgravity combustion experiments will also be carried out on the manned space station.The China Space Station Combustion Science Rack(CSR)project is to provide a safe and reliable platform for the space station combustion experiment,which can be used to conduct gas,liquid and solid combustion experiments.Based on this project,with the background of the research and development of the combustion science experimental system of the combustion science experiment rack of the space station,according to the existing experience at home and abroad,referring to the design of the Combustion Integrated Rack(CIR)of the international space station,this paper designs the system and verifies the scheme.Chapter 2 of this paper gives the design principles of the combustion chamber,introduces the finite element analysis method and mechanical environment test method,and provides theoretical support for the subsequent finite element simulation analysis and mechanical environment test.Chapter 3 designs the scheme of the combustion science experiment system.The mission objectives and technical indicators are analyzed in detail,and the scheme design of the combustion science experiment system is completed according to the functions that the system should have.The design features and principles of the structure are described in detail in terms of the functions and subsystems of the structure.Chapter 4 analyzes the feasibility of the design scheme of the combustion science experiment system.In order to verify the rationality of the structural design,the structural technology components of the combustion science experiment system were constructed.Finite element analysis of the combustor,multi-functional optical plate and the whole structure was carried out using finite element software.The strength and dynamic response characteristics of the structure were comprehensively analyzed.The results showed that the structural strength and rigidity meet the design requirements.The PIV velocity measurement scheme of the combustion diagnosis subsystem was experimentally verified.The cold field experiment and the combustion flow field experiment verified the feasibility of this measurement method for low-speed flow field measurement,and proposed an improved method for the subsequent PIV measurement system design.In Chapter 5,the mechanical environment test of the structural technology parts of the combustion science experiment system was completed.In order to further verify the rationality of the structural design,according to the dynamic load that the system bears during the process of transportation,the mechanical environment test plan of the structural process parts of the combustion science experiment system was designed and implemented,and the structural process parts were carried out in the three directions of X,Y,and Z.The results of the sinusoidal vibration test and the random vibration test show that the test requirements are met,the scheme is reasonable and feasible,and it has certain guiding significance for the subsequent design of the combustion science experiment rack. |
PDF Full Text Request