Influence of gas desorption in a safety relief valve undergoing cavitation

29th IAHR Symposium on Hydraulic Machinery and Systems

Lema, Marcos^1 ; Gosset, Anne^1 ; Peña, Fernando López^1

University of A Coruña, A Coruña

15000, Spain^1

关键词: Cavitation inception;    Characteristic curve;    Choked-flow condition;    Experimental facilities;    Fluid temperatures;    Safety relief valve;    Saturation levels;    Standard conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/6/062030/pdf
DOI  :  10.1088/1755-1315/240/6/062030

来源: IOP

【 摘 要 】

In this study, the characterization of the flow through a safety relief valve (SRV) is performed in presence of cavitation and gas desorption. For this purpose, a transparent safety relief valve model is used on an experimental facility in which the flow conditions (mass flow rate, fluid temperature, and pressure upstream and downstream the valve) can be accurately monitored. For two different valve openings, the characteristic curves are measured while flow visualization is performed on the transparent model. The results show that choked flow conditions are reached only for the smallest valve opening, with a remarkable repeatability. In order to take into consideration the gas saturation level of the working fluid, the vacuum system used to adjust the pressure downstream is also used for gas desorption by storing the liquid under vacuum conditions, a process known as vacuum degasification. In saturated liquids the evolved gas bubbles modify the flow properties, such as the speed of sound, and this may have an influence in the cavitation inception and the occurrence of choked flow. This study proves that gas saturated water in standard conditions (atmospheric pressure and 293 K) has the same behavior that fully deaerated water, both under the same cavitating conditions. It is thus not necessary to take the saturation level of the liquid into account when in standard conditions. The same is not expected in pressurized saturated liquids, which is currently under study.