离心泵叶轮内部粘油流动激光测速计测量

FLOW MEASUREMENT OF VISCOUS OIL IN A CENTRIFUGAL PUMP IMPELLER USING LASER DOPPLER VELOCIMETER

利用二维激光测速计系统准确地测量了离心泵输送粘度为４８ｍｍ２／ｓ粘油时最优和小流量工况叶轮内部流动。试验表明，叶片吸力面有很宽的尾流，压力面不存在射流，叶轮内部流动属主流／尾流模型。尾流位于吸力面／前盖板、吸力面／后盖板拐角处，并覆盖整个吸力面。由最优工况变到小流量工况，尾流有扩大趋势。

The internal flow in a centrifugal pump impeller is measured accurately by using two dimensional Laser Doppler Velocimeter(LDV) at best efficiency and part loading points, respectively, as the pump hand ing the viscous oil whose kinematic viscosity is 48 mm 2/s.The measurement shows that there is a wide wake near blade suction side and not a jet near blade pressure side so that the internal flow in a centrifugal pump impeller dose not present the well known wake/jet flow model, but a wake/primary flow model. the wake is located at two corners of shroud and hub with the suction side, and covers the whole suction side. While pump work condition moves from the best efficiency point to part loading point the wake will be enlarged.