The purpose of computer simulation is to use the powerful computing power of the computer to calculate for different variables, and use the graphics function of the computer to express the relationship between the flow characteristic parameter and the gas pipeline length L and inner diameter d with a curve, which is beneficial to qualitative analysis The relationship between the flow characteristic parameters and the geometric dimensions of the gas pipeline.
The computer simulation analysis program is compiled in C language, and compiled and passed by the easy-to-use LABWINDOWS / CVI compilation environment launched by NI.
Corresponding program was compiled according to the purpose of simulation, and the value of the sound velocity conductance and critical pressure ratio of the gas pipe with a given length and inner diameter was obtained through the program. Here, the average loss coefficient along the path is regarded as a constant 0.02. The relationship between the flow characteristic parameters and the length and inner diameter of the gas pipeline.
According to the definition of the relevant flow characteristic parameters in the experimental study, the sound velocity conductance value is related to the parameters of q * m, T1, 0, p1 and T0 (= 293.15K). Therefore, to obtain the sound velocity conductance value through the experimental method, it must Three values ​​of q * m, T1, p1 were measured. Since q * m is the mass flow rate through the element in a congested flow state, it must be ensured that the flow velocity in the pipeline reaches the speed of sound during the test.
In addition to knowing the above parameter values, the measurement of the critical pressure ratio also needs to determine the outlet pressure P2 of the measured element under subsonic flow and the mass flow value Qm at this time. Substituting these parameters into (1) can obtain the critical pressure ratio b value. Under the subsonic flow state, the flow characteristic curve is approximately a quarter ellipse, and the measured P2-Qm value is the point on the ellipse, tested under different pressure and flow, can get through this series The approximate ellipse of the point can be obtained by calculating the average value.
The experimental data shows that the test value of the gas pipeline flow characteristic parameter is basically consistent with the theoretical value, and the approximate formula can be used to calculate the value of the gas pipeline flow characteristic parameter in engineering use.
in conclusion
The research on the approximate calculation formula of the gas pipeline flow characteristic parameters has important practical significance for the performance analysis and optimization design of the pneumatic system. In this paper, according to the definition of ISO6358 on the flow characteristic parameters of sound velocity conductance C value and critical pressure ratio b value, combined with the relevant aerodynamic theory, the calculation method of the gas pipeline flow characteristic parameters is given, and the corresponding computer program is compiled for simulation. Using the simulation results and the least squares fitting method, the approximate formula for calculating the gas pipeline flow characteristic parameters is proposed for the first time and verified by experiments. The above approximate calculation formula has good practical value in engineering applications.
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