| 摘要 |
PROBLEM TO BE SOLVED: To reduce temperature of high speed exhaust gas discharged from an exhaust pipe used for a turbine engine of a small size vertical take-off and landing aircraft. SOLUTION: An exhaust pipe structure is provided with a first duct 30 in which exhaust gas discharged from a turbine engine circulates and a second duct 40 in which outside air around the turbine engine arranged to form a double pipe around the first duct 30 circulates. An opening part 30a discharging exhaust gas of the first duct 30 and an opening part 40a discharging outside air around the turbine engine of the second duct 40 are arranged to form a double pipe at roughly same position in a longitudinal direction, and the opening part 30a of the first duct 30 is formed to keep the distance from a center line to an outer circumference line in a cross section at a predetermined length or shorter. COPYRIGHT: (C)2007,JPO&INPIT
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