微细通道内蒸汽直接接触间歇凝结压力振荡特性
Pressure oscillation characteristics of direct contact condensation in a microchannel
李树谦 1张超群 2张东 3侯娜娜 1张猛 3马坤茹3
作者信息
- 1. 河北水利电力学院土木工程系,河北 沧州 061001;河北省数据中心相变热管理技术创新中心,河北 沧州 061001;沧州市储热及低品位余热利用型电磁供热技术创新中心,河北 沧州 061001
- 2. 河北建筑工程学院能源工程系,河北 张家口 075132
- 3. 河北科技大学建筑工程学院,河北 石家庄 050018
- 折叠
摘要
为探究微尺度条件下蒸汽直接接触间歇凝结瞬时压力振荡特性,开展了T型微细通道内间歇凝结压力测量实验及频谱分析等.研究发现,在蒸汽温度100℃、蒸汽质量流量0.45g/min、过冷水温度40℃以及过冷水质量流量12.65g/min工况下,间歇凝结压力时域信号在-29.5～8.8kPa之间波动,压力值在2.5kPa附近的概率密度最大.此外,通过频谱分析发现压力频域信号的第一主频为10Hz,与1s内间歇凝结经历的周期数量相近.
Abstract
In order to investigate the instantaneous pressure oscillation characteristics of steam direct contact intermittent condensation under microscale conditions,experiments and spectral analysis were conducted on the measurement of intermittent condensation pressure in a T-shaped microchannel.It was found that under the working conditions of steam temperature 100℃,steam mass flow rate 0.45g/min,supercooled water temperature 40℃ and supercooled water mass flow rate 12.65g/min,the time domain signal of intermittent condensation pressure fluctuates between-29.5kPa and 8.8kPa,and the probability density of the pressure value near 2.5kPa was the largest.In addition,through spectrum analysis,it was found that the first dominant frequency of the pressure frequency domain signal was 10Hz,which was similar to the number of cycles experienced by intermittent condensation within one second.
关键词
微细通道/直接接触/间歇凝结/压力振荡/频谱分析Key words
microchannels/direct contact/chugging/pressure oscillation/spectrum analysis引用本文复制引用
基金项目
国家自然科学基金(51976052)
河北省自然科学基金(E2020412176)
出版年
2024
国家科技期刊平台
NSTL
万方数据