Pressure pulsations in piping systems excited by a centrifugal compressor (1st report, evaluation model and characteristics of pressure pulsations under resonant conditions)

Pressure pulsations in piping systems excited by a centrifugal compressor or fan at blade passing frequency were investigated by experiment and numerical simulation. A one-dimensional pressure excitation source model for a compressor was proposed based on the equation of motion, to establish the practical evaluation method for pressure pulsations in piping systems. As a result Of experiment, the maximum pressure amplitude in a piping system increased as the location of a compressor was close to the node of the pressure distribution of the resonant mode. This relation between the maximum pressure amplitude in piping systems and the location of an excitation source under resonant conditions can be evaluated by introducing the equivalent resistance of a compressor and that of piping systems. The role of the system resistance to the response of pressure pulsations was discussed in detail.