采用重整化群(renormalization group,RNG)理论k-ε湍流模型以及流体体积(volume of fluid,VOF)函数气液两相流模型对有压管道局部高点滞留气团的排出进行数值模拟,计算出气泡开始出现破碎的临界流速v1、气泡开始有效破碎且小气泡被带...采用重整化群(renormalization group,RNG)理论k-ε湍流模型以及流体体积(volume of fluid,VOF)函数气液两相流模型对有压管道局部高点滞留气团的排出进行数值模拟,计算出气泡开始出现破碎的临界流速v1、气泡开始有效破碎且小气泡被带走的临界流速v2以及气泡被一次性带走的临界流速v3。此外,通过粒子图像测速(particle image velocimetry,PIV)系统测试了3种临界速度下的流场结构。研究表明:有压管道下降角度增大,3种临界流速均增大;随着滞留气团的体积变大,临界流速v1减小,而临界流速v2和v3均增大;在管道直径、下降角、气量均不变的情况下,临界流速v3比v2大2%~10%,但临界流速v1远小于v2。展开更多
Korea Atomic Energy Research Institute (KAERI) has been carrying out a scaled-down moderator test program to simulate the CANDU-6 moderator circulation phenomena during steady state operation and accident conditions. ...Korea Atomic Energy Research Institute (KAERI) has been carrying out a scaled-down moderator test program to simulate the CANDU-6 moderator circulation phenomena during steady state operation and accident conditions. The Moderator Circulation Test (MCT) facility was designed and constructed as 1/4 scale of the prototype of CANDU-6 reactor. In the present work spatial distribution of two-dimensional velocity in the MCT facility under isothermal condition was measured using planar Particle Image Velocimetry (PIV) system which consists of double pulsed laser, synchronizer, and high speed camera. TSI’s Insight TM 4G software was used to perform PIV image capturing, PIV calculation and post processing. 10 μm sized silver-coated hollow sphere particles were used as flow tracer particles. Multiple experiments were conducted to cover large area of the MCT facility with limited field of view of a single camera. Instantaneous and averaged velocity field were analyzed for each spatial position and flow rate. This research is capable of offering validation data for self-reliant CFD tools to predict moderator subcooling margin in CANDU-6 reactor.展开更多
文摘Korea Atomic Energy Research Institute (KAERI) has been carrying out a scaled-down moderator test program to simulate the CANDU-6 moderator circulation phenomena during steady state operation and accident conditions. The Moderator Circulation Test (MCT) facility was designed and constructed as 1/4 scale of the prototype of CANDU-6 reactor. In the present work spatial distribution of two-dimensional velocity in the MCT facility under isothermal condition was measured using planar Particle Image Velocimetry (PIV) system which consists of double pulsed laser, synchronizer, and high speed camera. TSI’s Insight TM 4G software was used to perform PIV image capturing, PIV calculation and post processing. 10 μm sized silver-coated hollow sphere particles were used as flow tracer particles. Multiple experiments were conducted to cover large area of the MCT facility with limited field of view of a single camera. Instantaneous and averaged velocity field were analyzed for each spatial position and flow rate. This research is capable of offering validation data for self-reliant CFD tools to predict moderator subcooling margin in CANDU-6 reactor.
