In order to complete the design of the fifth-generation turboshaft engine from the conceptual design stage to the preliminary design stage

the integrated design method based on the overall performance and size and mass of the turboshaft engine was studied. Through statistical evaluation of typical models of turboshaft engines at home and abroad

a database of technical parameters such as overall performance

overall structure

and the components aerodynamic/structure/strength/material properties of turboshaft engines was established; the concept of difficulty coefficient was proposed

and the technical parameters of the turboshaft engine were selected in the conceptual design stage using difficulty coefficient. An integrated design calculation model and program for the overall performance and size and mass of the turboshaft engine were developed

the overall performance of the tuboshaft engine was achieved under the constraints of the design criteria. Design of overall performance and other components performance

such as the aerodynamic/structural/strength/size/mass of the rotor components

was completed under the constraints of the design criteria. Results show that this design method can complete the overall design scheme of the turboshaft engine

and in this way

the fifth-generation turboshaft engine with 1500 kW shaft power was designed with specific fuel consumption (SFC) of 0.248kg/(kW·h) and P/W of 10.26kW/kg.