余热发电系统双S型旋流片喷嘴内部闪蒸过程数值研究

doi:10.3976/j.issn.1002-4026.2021.06.010

Abstract

Abstract:

Flash evaporation refers to the abrupt vaporization of liquid when it undergoes a sudden pressure drop. It has broad application prospects in the field of waste heat recovery in energy-intensive industries. Motivated by the lack of research on internal flow and phase-change phenomena inside the nozzle in a waste heat power generation system, in this work, we conduct numerical research on the internal flashing in a typical nozzle with two S-shaped internal vanes. The mathematical description of this problem is given by coupling the Volume of Fluent model and the pressure-driven phase-change model, and a numerical solution is obtained using CFD software. Results show that the fluid starts to rotate and accelerate when it flows through the S-shaped vanes. Downstream the vanes, the rotation speed is low in the middle and high near the wall. After that, the fluid accelerates and ejects through the contraction section of the nozzle. Pressure drop downstream the vanes leads to flash evaporation inside the nozzle, and fluid leaves the nozzle as a liquid-vapor mixture. In addition, a modified nozzle structure is proposed from the perspectives of improving atomization, reducing fouling, and enlarging passage area. The proposed structure can promote the complete and rapid progress of spray flash evaporation and help to further improve the efficiency of the waste heat power generation system.

Key words: flash evaporation, numerical simulation, two-phase flow, phase change

CLC Number:

TK124

JI Can, LIU Zhi-gang, LÜ Ming-ming. Numerical investigation of the flash evaporation process inside a nozzle with two S-shaped internal vanes in a waste heat power generation system[J].Shandong Science, 2021, 34(6): 77-82.

Figures/Tables 10

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References 15

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Numerical investigation of the flash evaporation process inside a nozzle with two S-shaped internal vanes in a waste heat power generation system

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