摘要
利用一维非定常气流理论,建立了管道中气体传播的分布式参数模型,采用迎风差分的方法进行数值计算,并通过实验结果与模型仿真结果的比较,验证了该模型的正确性.通过改变管道直径、气源速度、入口压强和仿真空间步长等初始条件,模拟不同特性的管道,对仿真结果进行比较分析,得到不同波形的压力波在不同管道中传播的特性.结果表明:利用压力波测流量时,应采用下弦波或矩形波.
Based on the theory of one-dimensional unsteady flow,a distributed parameter model of gas transmitting in pipeline was given.Then the model was solved with upwind difference formula,numerical simulations of the transmission of pressure waves in the pipe were also performed.Comparing the result of simulation with experiments,it was verified that this model was correct.And then the initial condition,such as the pipe diameter,air velocity,inlet pressure and the space step of simulation,was changed to simulate the different characteristics of the pipeline.Comparative analysis of the simulation results,the characteristics of the pressure waves of different waveforms under different conditions in the pipeline were obtained.The simulation shows that when using pressure wave to gas flow measure,it should use the waveform of half part of sine or square.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2011年第5期600-604,共5页
Journal of Beijing University of Aeronautics and Astronautics
基金
国家自然科学基金资助项目(50705004)
高等学校博士学科点专项科研基金资助项目(20070006041)
关键词
非定常气流
迎风差分
压力波
传播
unsteady gas flow
upwind difference
pressure wave
transmit
