Zou proposed a metric for rotation. The formation of galaxy velocity curves, etc., can be well explained by this rotation metric. It only needs to go through the field equations of general relativity, and no longer needs to be corrected by introducing additional dark matter gravity. This study believes that the rotation coordinates in the Zou metric are actually due to the dark matter vortex caused by the turbulent flow of the dark matter fluid. From the Zou metric, far from the center of the galaxy, the speed of the rotating coordinate will decrease to 0, becoming a flat metric. This reflects that far from the galactic matter, there is actually a laminar flow of dark matter fluid. Therefore, the Zou metric can be used to describe some important properties of dark matter fluids. This study applies it to explain the flight of the Voyager spacecraft after entering the galaxy space. It is thought that Voyager will first enter an interface between the visible and dark matter laminar flow of galaxies. The enter of dark matter turbulence will cause a certain degree of random change in the attitude of Voyager. Once it passes through this dark matter turbulent layer, the Voyager spacecraft will enter the high-speed dark matter laminar flow region. In this region, due to the energy dissipation characteristics of the dark matter fluid, the spacecraft will have an automatic acceleration phenomenon.