The cavitation development process in regulating valve under different inlet pressures is investigated experimentally and numerically in our paper. The influence of inlet pressure P_in on cavitation location, shape, area and intensity is studied in axial and radial directions, and the axial and radial pressure distributions are also analyzed. The cavitation is generally annular in shape radially and irregular polygon in shape axially. Cavitation bubbles occur at the throat entrance when the inlet pressure increases. The bubbles then accumulate, and a bubble ring is formed. The cavitation development process under different inlet pressures is separated into three stages, no-cavitation, initial cavitation and steady-cavitation stages. During the no-cavitation stage, no bubbles exist. During the initial cavitation stage, bubbles occur and the area and intensity of cavitation increase in the radial and axial directions with increasing inlet pressure. During the steady-cavitation stage, the calculation area and intensity of bubble rings reach their maximum values and then remain stable. The cavitation bubbles extend downstream, and the area of cavitation ring and cavitation intensity increase with increasing inlet pressure. A slit exists between the upper and lower parts of bubbles in the cavitation process, both parts touch each other forming a whole.

本文通过实验和数值研究了在不同进口压力下调节阀的气穴形成过程。入口压力P _in的影响研究了在轴向和径向方向上空化的位置，形状，面积和强度，并分析了轴向和径向压力分布。空化通常在径向上是环形的，在轴向上是不规则的多边形。当入口压力增加时，在喉咙入口处会出现气蚀气泡。然后气泡累积，并形成气泡环。在不同入口压力下的气蚀发展过程分为三个阶段：无气蚀，初始气蚀和稳定气蚀两个阶段。在无气蚀阶段，不存在气泡。在初始气蚀阶段，随着入口压力的增加，气泡发生，并且气蚀的面积和强度在径向和轴向上增加。在稳定气蚀阶段，气泡环的计算面积和强度达到最大值，然后保持稳定。空化气泡向下游延伸，并且空化环的面积和空化强度随入口压力的增加而增加。在气蚀过程中，气泡的上部和下部之间存在缝隙，这两部分相互接触形成一个整体。