Investigation Of The Numerical Simulation On Porpeller/Wind Turbine Using Steady And Unsteady Methods

In the21st century, energy conservation and the development of green energy havebecome the themes of our age, especially in the aerospace, wind energy and otherfields. The development of advanced propeller engines and large-scale wind turbineshas been paid more and more attention. The research methods of propellers and windturbines and other rotating machinery, mainly included numerical simulations, windtunnel experiments and flight experiments/outdoor measurements. With thedevelopment of computer technology and numerical theory, numerical simulation hasobvious advantages: Firstly, numerical simulation can simulate the real states directly,which close to realistic conditions; Secondly, numerical simulation do not required tomachining model, therefore there is no interference problems, and has the advantagesof short cycle, low cost; Thirdly, numerical simulation is easy for a variety ofconfigurations, and other aerodynamic design and optimization. Also numericalsimulations have the advantages of versatility and scalability.In this paper, the steady and unsteady calculation modules which based onself-developed large-scale "TRI sonic Platform"(TRIP3.0) and applied to windturbines and other rotating machinery was developed. Using steady and unsteady Eulermethods to simulate and verify the case study on single propeller separately. Also, awhole turboprop aircraft was simulated, especially in the effect of slipstream. At thesame time, the unsteady N-S equation on NREL Phase VI wind turbine model wascalculated and verified with the data of wind tunnel, also the pressure distribution atdifferent position and the effects of calculation results caused by real time step werecompared.This paper is divided into six chapters, each chapter is summarized as follows:The introduction summarizes the research background and significance of thepropellers, the wind turbines and other rotating machinery. then a brief review of thedevelopment propeller theory and numerical simulation methods, finally the mainwork of this paper was introduced.The second chapter introduces the main numerical simulation methods of propeller,such as the control equation, discrete methods, the accelerating convergence technique,grid generation technique;The third chapter uses the steady and unsteady methods to simulate a singlepropeller and compared with the wind tunnel experiment;The fourth chapter through the numerical simulation study of a complex turbopropaircraft, comparative analysis of the results calculated by steady and unsteady methods, and the effect by blade unsteady slipstream is studied. At the same time, the results ofthe steady and unsteady methods at different angles of attack and speed conditionswere compared and analyzed.The fifth chapter uses the unsteady N-S method for the numerical simulation ofvarious conditions on the NREL Phase VI wind turbine model, focusing oncomparative analysis of pressure coefficient on different stations at the blade,respectively dynamic patched-grid and crossed-grid techniques were analyzed. In orderto ensure the accuracy of calculation, the results of different real time step werecompared.The sixth chapter is the conclusion, the summary of this work was carried out. Atthe same time, the direction of future work proposed.