新型的灰渣阀的入口被设计成渐缩段,通过改变传统阀体结构来提高抗磨性能。该型式的阀门可使来流束缩成射流,使高磨损的固液流跳过阀体槽,降低该处所承受灰渣水流的磨损强度。本文介绍了其工作原理,并利用势流理论以及轴对称射流理论对流场进行分析,得出收缩水流的解析式并进行数值计算,给出了阀门入口设计参考值。 The entrance of the new ash valve is designed as a tapered section, improving wear resistance by changing the traditional valve body structure. This type of valve reduces the flux of the incoming stream into a jet, allowing high-wear, solid-liquid flow to bypass the body slot and reduce the wear strength of the ash flow carried there. In this paper, its working principle is introduced. Based on the theory of potential flow and axisymmetric jet theory, the flow field is analyzed. The analytic formula of shrinkage flow is derived and numerical calculation is given. The reference value of valve inlet design is given.