Calculation method for predicting influence of swirl distortion intake air on performance of aero-engine

Abstract

The invention discloses a calculation method for predicting an influence of swirl distortion intake air on the performance of an aero-engine, which organically combines a three-dimensional physical model with a two-dimensional multi-sub parallel engine part model and is suitable for analyzing the influence of complex swirl distortion intake air on the performance of the whole aero-gas turbine engine. The method comprises: describing engine impeller mechanical part by adopting a three-dimensional body force model, wherein a multi-stage gas compressor and a turbine are included; describing a combustion chamber and an exhaust nozzle by adopting a two-dimensional multi-sub parallel engine part model; setting a numerical value transmission interface between the three-dimensional model and the two-dimensional model to realize conversion between three-dimensional calculation and two-dimensional calculation; supplementing a rotor kinetic equation and an engine control rule to realize work balance calculation between the turbine and the gas compressor, and determining the rotating speed of the engine in real time; and applying large-scale rotational flow distortion inlet air to the boundaryof an inlet of an air compressor, and obtaining the influence of rotational flow distortion on the performance of the whole aero-engine and the internal distortion flow field characteristics of a compression system in the whole aero-engine environment on the basis of time-marching solving.

Description

technical field [0001] The invention belongs to the technical field of numerical simulation of aero-engines, and in particular relates to a calculation method for predicting the influence of swirl distortion intake air on the performance of aero-engines. Background technique [0002] The numerical simulation of each component in the traditional aero-engine design system is relatively independent, mainly relying on physical tests to expose design problems in the later stage, and adopting the iterative development mode of design / test, which greatly increases the development cost, cycle and risk of the engine. Since the 1980s, Western aviation powers have successively implemented special research programs on high-precision numerical simulation technology for aero-engines, such as the NPSS (Numerical Propulsion System Simulation) program in the United States and the VIVACE (Value Improvement Through a Virtual Aeronauti-cal Collaborative Enterprise) program in the European Union. ...

AI Technical Summary

Problems solved by technology

However, there are few public reports on the application of this technical concept in the numerical simulation of engine intake distortion, except that Pachidis et al. from Cranfield University have coupled the two-dimensional streamline curvature method of compression parts with the zero-dimensional simulation model of the engine, and analyzed The influence of radial total pressure distortion on the performance of the whole machine (Pachidis V, Pilidis P, Templalexis I, et al. Prediction of engine performance under compressor inlet flow distortion using streamline curvature[J]. Journal of Engineer-ing for Gas Turbines and Power ,2007,129(1):97-103.)

Images