Numerical Study on Flow and Noise Characteristics of High-Temperature and High-Pressure Steam Ejector

Based on the shear stress transfer (SST) k-ω model, Ffowcs-Williams and Hawkings (FW–H) equation, Lilley sound source flow field of high-temperature high-pressure steam ejectors are simulated. The entrainment performance, near-field source, far-field noise ejector discussed. influences working parameters including primary pressure, secondary back pressure analyzed. results show that under design conditions, has two shock waves three regions. A layer at boundary first wave generates Sound source-I, separation second causes source-III. source-II is located near mixing chamber wall levels around depend distances from source-II. In terms with increasing or decreasing as driving difference decreases, so does ratio. As increases, ratio firstly remains constant, then rapidly decreases when exceeds critical value pb = 5.5 MPa. characteristics, level intensity have a positive correlation. When increases. Moreover, reaches minimum 98.2 dB slowly