Abstract
In order to improve the low noise design level of the steam pipeline, the single-hole jet noise with a hole diameter of 10 mm was simulated and analyzed employing a DN125mm steam pipeline. The calculation results show that the in-tube injection has a distinct velocity potential nuclear region, and the vortex generated by the injection is changeas as the flow direction changes. The closer the nozzle is, the smaller the vortex volume at the nozzle is as well as the higher the radiation noise frequency is. The injection noise has obvious directivity. the closer the position is to the center line, the stronger the total sound pressure level is, and the farther the distance is, the total sound pressure level is relatively low.
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