Air intake of a pull-in layout for engine power output

Abstract

A pull-in type layout aircraft air inlet for engine power output, comprising an air inlet base, the air inlet base is arranged on the back of the nose of the aircraft, and the air inlet base is composed of an inlet of the air inlet, an air inlet Composed of pipe and inlet outlet, the inlet pipe gradually bends and reverses to the inlet outlet after passing through the inlet, and finally forms a C-shaped pipe; in order to improve the intake efficiency of the inlet and reduce the distortion of the inlet outlet , the inlet of the inlet is provided with an inlet partition to eliminate part of the boundary layer airflow; the present invention adopts a piggyback C-shaped intake in the form of a pull-in convergence, with high performance, and the inlet in a typical flight state The outlet total pressure recovery coefficient can reach 0.99, and the quality of the outlet flow field is good, which can provide the stable flow field required for the engine to work, thereby ensuring the normal and stable operation of the engine, and well reducing the impact of the inlet on the overall layout of the aircraft.

Description

technical field [0001] The invention relates to the technical field of aircraft aerodynamic design, in particular to a pull-in layout aircraft air inlet with engine power output afterward. Background technique [0002] In general, turboprop aircraft are divided into push type and pull type. The engine equipped with pull type turboprop aircraft is generally a power output engine with front air intake, and the propeller is installed at the front of the engine; push type turboprop aircraft The engine is generally installed at the tail of the aircraft, which is the output engine after the power, the nose intake, and the propeller is installed at the rear of the engine. The required airflow of the turboprop aircraft with the above two layouts enters directly or deflects 90° through the air inlet. For the engine, if the axial-flow air-intake engine with rear power output is installed on a pull-in layout propeller aircraft, the air inlet of the aircraft engine faces the rear, and a...

AI Technical Summary

Problems solved by technology

[0002] In general, turboprop aircraft are divided into push type and pull type. The engine equipped with pull type turboprop aircraft is generally a power output engine with front air intake, and the propeller is installed at the front of the engine; push type turboprop aircraft The engine is generally installed at the tail of the aircraft, which is the output engine after the power, the nose intake, and the propeller is installed at the rear of the engine. The required airflow of the turboprop aircraft with the above two layouts enters directly or deflects 90° through the air inlet. For the engine, if the axial-flow air-intake engine with rear power output is installed on a pull-in layout propeller aircraft, the air inlet of the aircraft engine faces the rear, and at this time, the incoming flow needs to be deflected by 180° before entering the engine inlet, and the airflow turning angle is large , it is very easy to cause airflow separation in the inner pipeline, which will easily cause the engine to not work stably and affect the performance of the aircraft

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