低含液管线内液膜厚度分布特性的试验研究

摘要

湿气集输管线内存在低含液气液两相流动.利用相似准则建立试验管道,结合螺旋测微器设计出瞬时液膜厚度测量装置,对低含液管线内液膜厚度分布特性进行研究.结果表明:液膜具有波动性,水平管内液膜主要集中在底部,两侧存在薄液膜.同一表观气速下,随着表观液速的增加,液膜分布范围变大,最厚值先变小后增大;同一表观液速下,随着表观气速的增加,弯头下竖直管周向液膜最厚值和最薄值变小,周向等效均匀液膜厚度变小.%The gas-liquid flow with low liquid loading appeared in wet gas gathering pipelines.Experimental pipeline was established according to similarity criteria.A system of measuring transient liquid film thickness was designed with micrometer.Film distribution characteristics in the gas pipeline with low liquid loading were studied.The results show fluctuation in the film distribution.Liquid film is concentrated on the bottom of horizontal pipe.Thin film exists on the side walls of horizontal pipes.Under the same superficial gas velocity,the region occupied by liquid film is extended and the value of thickest film is increased first and then decreased with increasing superficial liquid velocity.Under the same superficial liquid velocity,the thickest and thinnest values of film thickness are decreased,and the circumferential equivalent uniform film thickness is decreased with increasing superficial gas velocity in the vertical pipe downstream of the elbow.