Taking the gas fuel control valve of gas turbine as the research object

based on the computational fluid dynamics method

the flow field distribution and flow change rule of the gas fuel control valve under the actual operating conditions are studied

and the flow characteristic curve of the valve is fitted. The results show that the mass flow of the control valve at the same opening has nothing to do with the change of the pressure behind the valve

and is in a blocked flow state when the pressure in front of the valve is 2.650 MPa and the pressure ratio behind the valve to that in front of the valve is 0.49～0.78; Under the same pressure ratio

the discharge coefficient is approximately linear with the opening

which is consistent with the actual requirements of the project; There is a linear correlation between the flow coefficient and throat area. By optimizing the valve core profile

the linear curve of throat area with opening is improved

and the linearity of the flow characteristic curve is improved.