Abstract:

Taking heating pipeline leakage as the object, the interior flow and acoustic source characteristics of pipe leakage were solved by coupling CFD with Computational Acoustics (CA). The influence of media pressure, temperature on the interior flow and acoustic source characteristics were analyzed using Fluent and Virtual. Lab Acoustics. The results showed that the flowing field near the leakage source presents an asymmetric fan- shaped structure. The leakage sound energy of the hot water pipeline is mainly concentrated in the low frequency band (0~20 Hz). The average sound pressure level increases with the increase of medium pressure, while decreases with the increase of the water temperature. The deviation between simulation results the experimental results in the literature is below 7.99%. This study provides a theoretical basis for improving the detection technology of heating pipeline leakage based on acoustic wave method. 

Key words:  heating pipeline, leaking acoustic source, CFD/CA, flowing characteristic, acoustic source characteristic