摘要
高海拔地区具有气压低、氧气稀薄的特点,影响水体中气核的分布。为揭示环境气压对水体中气核分布及水流空化特性的影响,研究了在常压地区实验室条件下可变气压环境水体中气核的观测方法及装置,观测和分析了不同环境气压下不同水体中气核的分布和数量。结果表明,环境气压越低,水体中气核总量越少,减少程度与水质有关;水体中气核分布呈幂函数,小粒径气核较多,主要分布在50μm以下,幂函数指数随气压降低呈减小的趋势;仅从水体气核特性角度分析,同种水体低气压下的初生空化数减小。
The high altitude area has the characteristics of low atmospheric pressure and thin oxygen, affecting the distribution of gas nuclei in water body. In order to reveal the influence of air pressure on the distribution of gas nuclei and cavitation characteristics of water, the method and device for observing gas nuclei in variable pressure under laboratory conditions were studied. The distribution and quantity of gas nuclei in different water under different air pressures were observed and analyzed. The results show that the lower the atmospheric pressure, the less the total amount of gas nuclei in the water, and the decrease is related to the water quality. The distribution of gas nuclei in water is power function, the exponent of which decreases with the decrease of air pressure, and the number of gas nuclei in small particles below 50μm is more. From the point of view of the distribution of water gas nuclei, the incipient cavitation number of the same water decreases at low air pressure.
作者
庞博慧
张陆陈
卢吉
迟福东
PANG Bo-hui1,2 ,ZHANG Lu-chen3 ,LU Ji2 ,CHI Fu-dong2(1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072,China; 2. Huaneng Laneang River Hydropower Ltd. , Kunming 650214, China; 3. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, Chin)
出处
《水电能源科学》
北大核心
2018年第9期30-33,共4页
Water Resources and Power
基金
中国华能集团科技项目(HNKJ16-H12
HNKJ17-ZC52)
云南省马洪琪院士2016年自由探索项目(2016HA012)
关键词
环境气压
气核分布
观测方法
高海拔
air pressure
gas nuclei distribution
observation method
high altitude
