| 摘要 |
A premixed fuel/air burner with velocity and fuel/air ratio control having a nozzle with a nozzle wall forming a Venturi mixer and a nozzle exit, means for separately introducing fuel and air into the Venturi mixer, a hollow body disposed in the nozzle and moveable in a longitudinal direction toward the nozzle exit, the hollow body having at least one orifice through a wall thereof at an angle with respect to a longitudinal axis of the nozzle such that fuel is injected through said orifice into the Venturi mixer. Movement of the hollow body toward the nozzle exit changes the cross-sectional area of the Venturi mixer and nozzle exit thereby permitting control of nozzle velocity of the resulting fuel/air mixture. To control the fuel/air ratio, a fixed orifice baffle is provided inside the hollow body which changes the opening of the orifice as the hollow body is moved toward the nozzle exit.
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