Novel high-speed coaxial double-rotor helicopter propelling system

Abstract

The invention discloses a novel high-speed coaxial double-rotor helicopter propelling system. Tail gas of a turboshaft engine is introduced into a downstream propelling system to drive a free turbine in the propelling system to rotate, and the free turbine drives a propelling propeller at the tail of a helicopter body to rotate so as to generate basic propelling force for increasing the flight speed of a helicopter, so that primary utilization of the engine tail gas is realized; and engine tail gas is discharged out of the body through the tail nozzle between the tail of the helicopter body and the propeller, the propelling efficiency of the propelling propeller is improved through high-speed wake flow flowing through the propelling propeller, so that secondary utilization of the engine tail gas is achieved, meanwhile, the engine tail gas is fully mixed with the external environment atmosphere, the infrared characteristic of the helicopter is greatly reduced, and the battlefield survival rate of the helicopter is improved. Meanwhile, the propelling propeller is located in the underwash flow field of the rotor wings, so that the propelling efficiency of the propelling propeller is improved, the propelling force of the propelling propeller is improved again, and finally the purpose of improving the flight speed of the helicopter is achieved.

Description

technical field [0001] The invention relates to a novel high-speed coaxial double-rotor helicopter propulsion system, which belongs to the field of increasing the flight speed of the coaxial double-rotor helicopter. Background technique [0002] Helicopters can take off and land vertically and hover in the field, and have good low-altitude maneuverability. They play an irreplaceable role in military and civilian fields. [0003] However, compared with fixed-wing aircraft, helicopters have disadvantages such as low flight speed and short range. People's demand for improving the flight speed and range of helicopters is increasing. Driven by the deepening demand, the development of new high-speed helicopters and related technologies The development has shown a trend of vigorous development. [0004] At present, the more successful high-speed helicopter configurations in the world mainly include tilt-rotor and coaxial dual-rotor compound propulsion. These two configurations hav...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve many problems such as the large exhaust energy loss of the current coaxial double-rotor compound propulsion high-speed helicopter, the difficulty in developing the mechanical power input system of the tail rotor, low reliability, complex vibration environment, and serious increase in the total weight of the helicopter for take-off. problem, a novel high-speed coaxial twin-rotor helicopter propulsion system is proposed

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