Abstract
The rotating flash flow has rarely been studied, although its characteristics affect significantly the performance of the two-phase flow turbine. In this paper, through analyzing the flashing flow obtained by CFD methods, which is validated with the experimental data, the relationships of average flow parameters under various rotational speeds were studied theoretically and numerically using the flow equations established on the Frenet coordinate system. The ratio of the mass flow rate under various rotational speeds was formalized and found to be dependent on the rotational speed and thermophysical properties. The generation and development of vapour were revealed and correlated to the geometry of the channel. The secondary flow in the flashing rotating channel was discussed and found to rotate in opposite directions upstream/downstream of the throat. The flashing induced near the throat had the effect on flow homogenizing in the normal direction of the cross-section. The analysis could be further applied to the analogy of the secondary flow between the rotating single-phase flow and the rotating flashing flow.
Highlights
The stationary flashing flow can take place in various industrial equipment, such as pipelines in nuclear plants [1], fuel injectors [2,3], CO2 ejectors [4], desalination chambers [5], safety valves [6,7], water and liquid nitrogen spray [8,9], converging-diverging nozzles [10,11], and so on
As revealed in previous researches [30,31,32,33,34,35,36,37] about the flashing flow profile in stationary channels, there is a vapour ring generated at the throat of the channel, which develops along with the flow or disappears after a certain distance depending on the geometry
Date et al [39] published the experimental performance of the two-phase reaction turbine and Rane and He [38] simulated the rotating flashing flow in this turbine, it can be found that in the flashing rotational channel, the variation of the mass flow rate under various rotational speeds has not been fully understood, the vapour ring has not been studied, and the secondary flow has not been revealed
Summary
The stationary flashing flow can take place in various industrial equipment, such as pipelines in nuclear plants [1], fuel injectors [2,3], CO2 ejectors [4], desalination chambers [5], safety valves [6,7], water and liquid nitrogen spray [8,9], converging-diverging nozzles [10,11], and so on. Date et al [39] published the experimental performance of the two-phase reaction turbine and Rane and He [38] simulated the rotating flashing flow in this turbine, it can be found that in the flashing rotational channel, the variation of the mass flow rate under various rotational speeds has not been fully understood, the vapour ring has not been studied, and the secondary flow has not been revealed. The flashing flow field in a two-phase flow turbine was analyzed numerically based on the flashing models proposed by Rane and He [38] and compared with the experimental data published by Date et al [39], and the vapour ring and liquid attachment effects were provided and analyzed.
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