Analysis of flow-rate characteristics for a Laval fuel flow-rate control valve

LI Hong-zhou1， XV Guang2， LI Song-jing1
（1. Department of Fluid Control and Automation， Harbin Institute of Technology， Harbin 150001，China；
2. Nanjing Office of The Navy， Nanjing 210018， China）

Abstract： It is the most important point for scramjet engine to control the supplying flow rate of fuel propely，and it is necessary to enhance the performance of the engine. In order to control the flow of gas fuel precisely in such high temperature situation in ramjet engines，a high flow control Laval valve for the ramjet engines was developed，which controls the gas flowing through the inlet passage of the engine. On this basis，a high temperature flow rate control valve for fuel supply was developed. Research on the characterristics of Laval nozzle mouth of the valve，and analysis on the velocity and pressure distribution with the finite element method were carried out. The research results indicate that，the rate of flow keeps the same when the opening of the valve and the inlet pressure are both fixed. The outlet pressure of the valve has no influence on the flow rate of the valve.
Key words： scramjet； Laval nozzle； flow-rate control valve； flow-rate characteristics