高压汽水两相流摩擦阻力特性的研究

A Study of Frictional Resistance Characteristics of High-pressure Steam-water Two-phase Flows

研究国产600MW直流锅炉水冷壁管在亚临界及近临界压力区的摩擦阻力特性。试验段为25×3mm的1Cr18Ni9Ti不锈钢管,试验参数为:压力p=12～21MPa,质量流量G=400～1200kg/(m2.s),质量含汽率x=0～1.0。试验研究了工质压力、质量流速和质量含汽率对摩擦阻力的影响。根据所得的大量实验数据,在理论分析的基础上得出了可供设计使用的水冷壁管摩擦阻力的关联式,计算值与试验值的相对误差在15%以内。

A study was performed of the frictional resistance characteristics of the water-wall tubes in subcritical and close-to-critical pressure zones of a 600 MW once-through boiler made in China.The test section consists of 1Cr18Ni9Ti stainless steel tubes having a diameter of 25×3 mm with the following experimental parameters:pressure p=12～21 MPa,mass flow rate G=400～1200 kg/(m2·s) and mass steam content x=0～1.0.Through the tests,studied was the impact of working medium pressure,mass flow velocity and mass steam content on the frictional resistance.On the basis of a great deal of data obtained from the tests and related theoretical analyses,a correlation formula of frictional resistance of water-wall tubes was derived,which is suited for design purposes.The relative error between the calculated values and test ones does not exceed 15%.