Numerical and experimental investigation of vane-piston separation-collision in variable-speed compressors

Separation and collision between the vane and piston of a variable-speed compressor increases internal leakage and has periodic effects. To understand the dynamic characteristics of the vane-piston separation-collision process, a platform was established to experimentally observe the vane motion, and the process and details of the vane motion were observed using high-speed photography and precision image-processing technologies. The results showed the occurrence of vane-piston separation-collision. A mathematical model of the vane-piston separation-collision process was established based on Lagrange's equations and the kinematic CoR, and this was verified experimentally. The characteristics and influencing factors of the separation-collision process were analyzed using the mathematical model. The results showed that the vane has different dynamic characteristics under different operating conditions. The separation-collision process is closely related to k and N.As k is increased, it becomes more difficult for the vane to separate from the piston. As N is increased, it becomes easier for the vane to separate from the piston. Our results provide experimental and theoretical input for how to prevent vane-piston separation in this type of variable-speed compressors. A mathematical model of the vane-piston separation-collision process was established based on Lagrange's equations and the kinematic CoR