The invention discloses a fin enhanced heat exchange
infrared suppressor which is suitable for an exhaust
system of a
turboshaft engine. The fin enhanced heat exchange
infrared suppressor comprises anair collection chamber, a
cold air inlet, a firewall, a plurality of
shunting spray pipes, mixing pipes, heat insulation covers, fins and the like. On one hand, the
momentum of the high-temperature gas behind the
turbine is utilized to pump
cold air in the air and then mix with the
cold air to reduce the mainstream temperature in a core area; and on the other hand, the downwash
airflow of a lifting rotor enters interlayers between the mixing pipes and the heat insulation covers, and the outer sides of the heat insulation covers, and the temperature at the surfaces of high-temperature components of the mixing pipes and the heat insulation covers is carried away through a fin enhanced heat exchange, so that the
radiation heat transfer of the high-temperature components to the
skin is reduced, and meanwhile, the mainstream temperature in the core area is reduced to a certain extent. In addition, a double-layer wall
surface structure has good shielding and
thermal insulation effects, anda sand-proof residual gas is introduced into a double-layer
skin structure, so that the temperature of the
machine body is basically consistent with the outside temperature and
infrared radiation of the
skin to the outside is further reduced.