CAJ | 학술논문

气固两相流体流经弯管时,在弯管内外两侧形成压差.已有的文献表明,该压差大小与气固两相流的混合浓度、气相流速、固相流速、弯管的曲率半径、弯管直径(或水力直径)等因素有关.一定条件下的固相颗粒对气相具有使其湍流强度抑制和加强两种作用,在分别对其进行数值模拟研究时发现:压差除受上述诸因素影响外,无论是在气相湍流抑制区还是湍流加强区,颗粒粒径对压差也具有较大的影响,尤其是颗粒粒径越小这种影响越显著,从理论上分析并解释了形成这种现象的原因,提出了以固相浓度为参变数的弯管内外两侧压差随颗粒粒径的变化的关联式.
기고량상류체류경만관시,재만관내외량측형성압차.이유적문헌표명,해압차대소여기고량상류적혼합농도、기상류속、고상류속、만관적곡솔반경、만관직경(혹수력직경)등인소유관.일정조건하적고상과립대기상구유사기단류강도억제화가강량충작용,재분별대기진행수치모의연구시발현:압차제수상술제인소영향외,무론시재기상단류억제구환시단류가강구,과립립경대압차야구유교대적영향,우기시과립립경월소저충영향월현저,종이론상분석병해석료형성저충현상적원인,제출료이고상농도위삼변수적만관내외량측압차수과립립경적변화적관련식.
It's well known that the pressure difference is produced between the outside and the inside of a bend when gas-solid two-phase flow passing through the bend. The existed references show that this pressure difference is related to following factors, mixture concentration of gas-solid two-phase flow, velocity of gas phase, velocity of solid phase, curvature radius of the bend, diameter of the bend (hydraulic radius) and so on. In certain case, solid phase particle can cause gas phase flow two regions, turbulence intensity restrained region and reinforced region. The numerical simula-tion in present research reveals that particle size has striking effects on the pressure difference both in the gas phase turbul-ence restraint region and in the turbulence reinforcement region, and the smaller particle size is, the more obvious the effect is. This paper analyzes theoretically the phenomena and proposes a correlation of the pressure difference between the outside and the inside of bend with particle size.