Fig 1.
Structure of hot airflow fan.
Fig 2.
Structure of the centrifugal fan(a) Impeller structure, (b) Volute structure.
Fig 3.
Internal structure of the heater. 1.Air Inlet 2.Fresh Air Wheel 3.Controller 4.Combustion Chamber 5.Hot Air Outlet 6.Exhaust Gas Outlet 7.Oil Inlet 8.Combustible Air Inlet.
Fig 4.
Structure of the fan.
Fig 5.
Computational domain of the fan (a) Computational domain, grid system and definition of boundary conditions, (b) Detail of the mesh in the interaction region.
Fig 6.
Sensitivity of air velocity to grid resolution.
Table 1.
k-ε model setup.
Fig 7.
Fan internal section.
Fig 8.
Comparison of air pressure contour for XY sections. (a) Air pressure contour for circular inlet structure; (b) Air pressure contour of the modified-inlet structure.
Fig 9.
Average air velocity of XY sections.
Fig 10.
Comparison of air velocity contour at the outlet. (a) modified-inlet fan contour at the outlet; (b) Circular inlet fan contour at the outlet.
Fig 11.
Comparison of air velocity of different fans.
Fig 12.
Effect of fan speed on air temperature and air velocity.
Fig 13.
Relationship between inlet air temperature and average air temperature of the fan oulet.
Fig 14.
Air temperature contour at volute temperature of 60 °C and z 0.324 m.
Fig 15.
Relationship between volute temperature and average air temperature of outlet.
Table 2.
Test results of response surface of Hot-air fan cleaning performance.
Fig 16.
Response surface of the air temperature interaction effect at the upper outlet.
Fig 17.
Response surface of the air temperature interaction effect at the lower outlet.
Fig 18.
Response surface for the air velocity interaction effect at the upper outlet.
Fig 19.
Response surface of the air velocity interaction effect at the lower outlet.
Fig 20.
Experimental setup components of the hot-air fans.
Fig 21.
Transverse distribution of airspeed and air temperature for hot-air fans.