Internal Structure of a Jet Nozzle for Coalbed Methane Mining Based on Airfoil Curves

Table 1

Seepage simulation parameter.

Parameter	Value
Simulation type	Steady state simulation
Fluid type	Water
Turbulence model	K-epsilon
Domain type	Single fluid domain
Heat transfer model	Isothermal model (25°C)
Time scale	Physical time scale (100 s)
Inlet pressure	= 30 MPa
Outlet pressure	Atmospheric pressure
Boundary conditions	Nozzle roughness 0.0466 mm
	Coal-water-jet drilling roughness 10 mm
	Nonsliding wall