Experimental investigation of the filling and draining processes of drainback systems (Part 2)

摘要

This paper presents the results from experimental investigations of the filling and draining processes of drainback systems (DBS). An experimental setup of DBS with transparent hydraulic components was built for these purposes. Three experiments have been carried out, evaluated and summarized: (1) impact of an air vent in combination with an air channel on draining and filling processes, (2) influence of the pump’s speed on the filling process, and (3) effect of the water level in the drainback tank on operation conditions. Some results of these investigations are: 1.A general method to measure the duration of the filling process for DBS is developed 2.Two types of draining processes “syphon draining” vs. “two columns draining” are compared 3.Air entrainments into the drainback tank due to splashing and vortex effects are analyzed Other results with explanations of the processes are presented in this paper. A familiarization with a previous publication- part 1 (Botpaev et al. 2013) is not required for a comprehensive reading of this work.