Pressure drop assessment of scaling distortion in reduced height test facility

In order to design a new type of nuclear reactor system, a scaling integral test facility must be built according to the general proportional modeling criterion. Compared with the full height simulation, the reduced height integral test has higher requirements for the scaling analysis of pressure drop parameters. This paper focuses on the pressure drop parameters in reduced height integral test, and makes a comprehensive analysis of the distortion degree of the pressure drop parameters under normal operating conditions and natural cycle conditions. The results show that the gravity pressure drop and acceleration pressure drop can keep the scaling ratio being constant in both normal operating conditions and natural cycle conditions. The scaling ratio of both the frictional pressure drop and the local resistance pressure drop in the natural cycle condition is less than ι_R, which leads to the higher total pressure drop parameter in the natural cycle condition compared with the scaling ratio. (authors)