Influence Of Structure And Operating Parameters On Performance Of Gas Wave Divider

Gas wave divider is a new type of pressure switching equipment,its function is by entering a medium pressure fluid and then output a high pressure fluid with a low pressure fluid,it has simple structure,small size,can run the liquid and the advantages of convenient operation and maintenance,in the refrigeration and gas production and transportation,and other fields have broad application prospects.Wave rotor is the core component of gas wave divider.In this paper,by combining theoretical analysis,numerical simulation and experimental research,the internal flow process of wave rotor in the process of gas wave partial pressure is deeply analyzed,and then the influence law of various operating parameters and structural parameters on the performance of gas wave partial pressure device is studied.On this basis,the performance optimization method of gas wave divider under large expansion ratio is studied.The research contents and main conclusions of this paper are as follows:(1)The formation and reflection characteristics of pressure wave are analyzed by using the relevant theories of gas dynamics,and the working principle of gas wave divider is introduced.Based on this,the ideal wave diagram of gas wave partial pressure process is constructed,and the structural characteristics of gas wave divider are introduced.(2)Air wave divider numerical calculation model is established,and further analyzed the process of its internal flow,then studies the compression ratio,expansion ratio,and speed the influence law of the performance of gas wave divider,the study found that the performance of gas wave divider with the compression ratio,expansion ratio and speed of change and the change trend of present different,and under the specified speed,There is an optimal matching relation between the structural parameters and operating parameters of the gas wave divider.(3)A gas wave partial pressure experimental platform was built to study the influence of different operating parameters and structural parameters on the performance of gas wave divider.The experimental results show that when the expansion ratio is constant,the ratio of cooling temperature drop and high pressure air flow rate between middle and low pressure ports decreases with the increase of compression ratio.The larger the expansion ratio is,the larger the ultimate compression ratio it can reach,that is,the larger the expansion ratio is,the wider the pressurization range it can achieve.In certain cases,the compression ratio and low pressure port between the refrigeration temperature drop increases with the increase of the ratio of inflation,and high pressure gas flow ratio first increases and then decreases with increase of the expansion ratio of the trend,on the basis of the other operating parameters and structure parameters,the maximum high pressure gas flow of the corresponding expansion ratio does not change with the compression ratio and change.(4)Aiming at the problem of low performance of gas wave divider under large expansion ratio,a new medium pressure exhaust port is set up on the basis of three-port wave rotor,so as to carry out multi-stage pressure relief process for high pressure gas in the channel.The simulation results show that on the one hand,the structure can completely avoid the generation of shock wave in the low pressure port and reduce the shock loss;on the other hand,the gas velocity in the channel can be reduced to reduce the flow loss,so that the performance of the gas wave divider can be improved under the large expansion ratio.When other operating parameters and structure parameters unchanged,the export of medium pressure exhaust pressure exists an optimal value,when the exhaust pressure at the middle pressure outlet is low,shock waves will appear in the middle pressure exhaust port,resulting in shock loss.When the exhaust pressure at the middle pressure outlet is high,the gas velocity in the low pressure exhaust port is high,resulting in increased flow loss.Medium pressure outlet width has significant influence on medium pressure outlet flow and low pressure outlet flow,which should be set according to actual working conditions.