単動翼列多段チップタービン内の非定常流れ : 第二報:隔壁配置位置が効率に与える影響

概要

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Numerical simulations of the single rotor blade row with multi stage tip turbine were conducted to investigate a dependency of enthalpy drop on bulkheads positioning of the tip turbine. When leading edge of a rotor blade comes close to a stator blade which separates inlets of high pressure turbine (HPT) and low pressure turbine (LPT), a bulkhead which separate outlets of HPT and LPT should be placed with distance 2L toward the rotation direction of the turbine from the trailing edge of the rotor blade, where multiplication of a rotor speed U and mean rotor blade passing time T of fluid makes L. If the bulkhead is placed as mentioned above, the enthalpy drop of the tip turbine increases at a border where the turbine rotor blades proceed from LPT to HPT. While at a border where the turbine rotor blades proceed from HPT to LPT, the displacement of bulkhead should be zero instead of the 2L.
社団法人日本ガスタービン学会の論文
2006-03-20