An experimental investigation on the pressure oscillation induced by the steam jet condensation in water flow within a vertical pipe

An experimental investigation on the pressure oscillation induced by the steam jet condensation in water flow in pipes was conducted in this work. The saturation vapor with mass flow rate 0~150 kg·m^-2·s^-1 and pressure 0.2~0.4 MPa was injected into the water flow in the vertical pipe through a nozzle of diameter 8 mm. The water temperature and pressure ranges of the pipe flow are 30~70 ℃ and 0.11~0.15 MPa,respectively. The pressure fluctuation signal was captured by detecting the wall pressure signal. This paper systematically analyzed variations of the pressure wave which had low frequency and high amplitude with time at low steam mass flow rate,and presented the quantitative changes of pressure oscillation amplitude with steam mass flow rate and subcooled water temperature. And also included was the probability density function distribution,the variation of skewness coefficient and kurtosis coefficient of pressure fluctuation signal.