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| Analysis on Vibration and Noise Produced by Water Hammer in the Fuel Pipe of Gasoline Engines |
| DOI：10.13949/j.cnki.nrjgc.2022.02.013 |
| Key Words:water hammer orifice cavity modal hydraulic impact fuel pipeline common rail fuel injector pressure pulsation |
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| Abstract:Based on the plane wave theory， the mechanism of water hammer vibration in a common rail fuel pipe was analyzed， and the water hammer wave frequency and acoustic cavity modal frequency of the common rail fuel pipe were calculated with different pressures and temperatures on a three-cylinder engine and a four-cylinder engine. The modal frequencies and vibration modes of the acoustic cavity of the fuel pipe assembly and the pipeline structure were calculated with finite element modality analysis method. The distribution law of water hammer wave pressure in the common rail fuel pipe on the 1st cylinder， and the variation law of axial force in the common rail fuel pipe caused by the close of the needle valve of the injectar on the 1st to the 4th cylinder were simulated and analyzed with lattice Boltzmann method. The variation law of vibration and noise caused by water hammer in the common rail fuel pipe with engine operating conditions， pipeline structures， flow field structures， and acoustic cavity modallities were analyzed. The analysis results show that the axial force caused by the water hammer produced by the close of the needle valve of the injector impacts the ends of the common rail fuel pipe and produces vibration and noise. The vibration and noise is produced mainly by the two cylinder injectors which are close to the ends of the common rail fuel pipe， that is， the first and third cylinders of three-cylinder engine and the first and fourth cylinders of four-cylinder engine. And the vibration and noise is related to the pressure distribution of the acoustic cavity of the fuel pipe. The frequency of vibration and noise caused by water hammer is related to the structure modality and frequency of the pipeline. The vibration and noise changes with the working conditions of engines. An orifice on the channel between the common rail fuel pipe and the injector needle valve can effectively attenuate the water hammer energy， and reduce or eliminate the vibration and the rattle caused by the water hammer. |
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