The dynamic equation of the fluid pipeline is very similar to the dynamic equation in the circuit. Gerstoft P (1987) applied the circuit simulation theory to the pressure measurement system of the wind tunnel pipeline, replacing the previous method of directly solving the fluid dynamic equation. And further research on pipeline dynamic analysis. Based on the circuit transmission line theory, the dissipation model of the fluid pipeline is proposed and the relationship between the pipeline output and the pressure and flow rate is expressed by the matrix transfer relationship. Compared with the recursive Bergh_Tijdeman equation, the non-recursive dissipation model is more convenient to use, but He did not give the equation for parallel pipes. Based on the circuit transmission line theory, this paper deduces the equations that can be used for parallel pipelines, extends the application of the dissipation model to parallel pipelines, and compares the calculation results with the Bergh_Tijdeman equation of parallel pipelines and experimental values.
The PVC pipe in the pressure measurement pipeline system, the metal short pipe fixed at the pressure measurement hole on the surface of the model, and the restrictor can be regarded as simple pipelines; the pneumatic main pipe in the pressure measurement pipeline system and the cavity inside the sensor can be used To describe.
When considering the influence of the sensor on the frequency response function, it is generally equivalent to a series system of simple pipeline and cavity.
There are PVC pipes connected in parallel from the copper pipe of the pressure measuring hole on the model surface to the input pipe of the pneumatic manifold (pneumaticmanifold). In actual operation, the length and diameter of these parallel connected PVC pipes are required to be exactly the same. This is not only because of the convenience of calculation and experimental operation, but more importantly, the pipe size will affect the degree of signal distortion. If the length and diameter of the parallel-connected PVC pipes are inconsistent, the degree of distortion of the air flow from the pressure measurement hole on the model surface to the pneumatic main pipe will be different after passing through these pipes, so that the signal will be superimposed in the pneumatic main pipe. Can't reflect the real situation. In the experiment, the length and diameter of the parallel-connected PVC pipes should be the same, and should be as short as possible, so that the air flow from the pressure measurement hole on the model surface to the pneumatic main pipe is basically not distorted.
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