Three-dimensional CFD modeling and simulation on the performance of steam ejector heat pump for dryer section of the paper machine

摘要: Abstract A three-dimensional model of the steam ejector heat pump for dryer section paper machine was developed by applying Computational Fluid Dynamics (CFD) technique, which provided pressure and velocity distributions fluid flow in pump. The results indicated that field has an incomplete axially symmetrical distribution. entrainment ratio initially increases rapidly with increase ejected inlet then decreases after exceeds one certain value. There exists a critical value mixed under given operating conditions. optimal diameter constant area mixing to nozzle throat is about 3.4 length L/D m 6. An divergence angle diffuser observed different length. optimized position condition where maximum observed. CFD technique found be efficient alternative predict performance conclusions research can provide beneficial reference structural optimization design ejector.