Numerical Simulation And Optimization Design Investigation Of The Flow Field For Transonic Compressor Rotor

Fan/compressor is an important component of aero engine, the improvements of its performance have very significant effect on the engine. With development of numerical simulation technology, aerodynamic design method based on optimization theory was developed gradually, and had attracted lots of scholars to study and employ it. This paper employed three-dimension aerodynamic optimization design system to carry through aerodynamic optimization design for a tranconic compressor rotor named NASA Rotor 37.First, employing the experiment data of NASA Rotor 37, this paper proved the flow solution procedure of tridimensional N-S equation based on Dawes. Aimed on NASA Rotor 37, the flow numerical simulation was carried out using this procedure, and obtained detailed flow structure. Subsequently, this paper analyzed the flow characteristics in transonic fan rotor in detail.Through employing B spline curve to parameterize the mechanical vane of impeller, and converting it into constraint question and integrating with genetic algorithm and simulation anneal algorithm, control point of B spline curve can be solved conveniencely and accurately, and fitting precision can be ensured. Accordingly, better foundation was established for aerodynamic optimization redesign of impeller machine.The number of flow field evaluation times, which employed genetic algorithm or simulation anneal algorithm for finding optional solution simply, is tremendous. Based on combining response surface model with genetic algorithm and simulation anneal algorithm, aerodynamic optimization design system, which has the ability of global searching optimization high efficiently and accurately, is proposed. Through employed the system, tridimensional aerodynamic optimization of NASA Rotor 37 was redesigned. Aimed on influence actors of rotor blade aerodynamic performance, the paper considered camber line, thickness distribution and tridemensional stacking format respectively. Through constructing tridemensional vane of different format, the performances were analyzed in detail. Then based on this system, multi-objective optimization design of total performance parameters, which included overall pressure ratio and adiabatic efficiency and so on, was making, and its result was contrasted with single-objective optimization result. The contrast study indicated the essentiality of multi-objective optimization design. Subsequently, practice work of transonic compressor rotor requires better alterant work condition characteristics, and that design of single work condition point could not be ensured, so the paper employed above mentioned system to make elementary optimization design of multiple working condition points, and had numerical analysis.