Turboprop engine

Abstract

A turboprop engine comprises all structures of a propeller, axial-flow compressors, evaporative combustors, turbines, an exhaust nozzle and the like, and is characterized by further comprising by-pass pipes and internal exhaust valves, and external exhaust valves are mounted or are not mounted in pipes outside the engine and between air inlets and air outlets of the by-pass pipes; and when the engine is started for operation, the internal exhaust valves are opened, the supercharge ratios of the axial-flow compressors are increased and kept unchanged by means of the by-pass pipes and through opening and closing of the internal exhaust valves or the internal exhaust valves and the external exhaust valves, the increased supercharge ratios are not larger than the mechanical strength limit which can be borne by the axial-flow compressors and the turbines, the turbine inlet temperature is kept unchanged, that is, the supercharge ratios and a power weight ratio are increased, the oil consumption rate is reduced, however, the number of stages of the axial-flow compressors and the turbines is not increased, and the turbine inlet temperature is not increased.

Description

technical field [0001] The invention relates to a turboprop engine, in particular to a turboprop engine capable of increasing the boosting ratio and power-to-weight ratio, and belongs to the technical field of turboprop engines. Background technique [0002] In a turboprop engine, increasing the supercharging ratio of the compressor can increase power and reduce fuel consumption. To increase the supercharging ratio, at present, it is mainly to increase the number of stages of the compressor and turbine or to increase the gas temperature before the turbine; but the former Increased weight and volume are not conducive to improving the power-to-weight ratio. The latter must use high-temperature resistant, high-performance turbine blade materials, coating materials, and advanced cooling technologies. It is very difficult to improve; and the current turboprop engine The boost ratio is fixed and cannot be increased. Contents of the invention [0003] The purpose of the present ...

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Problems solved by technology

[0002] In a turboprop engine, increasing the supercharging ratio of the compressor can increase power and reduce fuel consumption. To increase the supercharging ratio, at present, it is mainly to increase the number of stages of the compressor and turbine or to increase the gas temperature before the turbine; but the former Increased weight and volume are not conducive to improving the power-to-weight ratio. The latter must use high-temperature resistant, high-performance turbine blade materials, coating materials, and advanced cooling technologies. It is very difficult to improve; and the current turboprop engine The boost ratio is fixed and cannot be increased

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