Abstract: In this paper, geometric models of throttling parts with three different structures are established based on the characteristics of pressure proportioner. The numerical simulation of the proportioner with different throttling parts is carried out by using Fluent software to analyze the pressure distribution and velocity distribution under design conditions.And through experiments, the mixing ratio and pressure loss of the three proportioner with different structures are studied. The influence of the structure characteristics of different pressure proportioner on the main performance parameters are analyzed. In the comparison of experimental and simulation results,the relative error of pressure loss under high flow rate is within ±10%, which provides a theoretical reference for the design calculation, selection and structure optimization of the proportional mixer.

Key words: pressure proportioner, throttling part, pressure loss, mixing rate, flow characteristics