| 摘要 |
This apparatus (1) includes an air intake duct, a volute (5) of which the inlet opening (22) communicates with the air intake duct, a first vane rotor (4) located immediately downstream of the inlet opening (22) of the volute (5), a motor (3) for driving the rotor (4), and a motor (3) for rotating the rotor (4) in order to generate a centrifugal air flow in the volute (5). The apparatus further includes: a casing (2) having a tubular portion (10a) located at a substantially constant distance from the motor (3), the casing (2) and the motor (3) thereby together bounding a gas flow passage (15) including at least one gas inlet orifice (20) and at least one gas outlet orifice (16); and a second vane rotor (6) located downstream of the gas inlet orifice (20) rotated in order to generate a forced gas stream in the gas flow passage (15).
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