النمذجة والتحليل الديناميكي لأداء Diffuser Augmented Wind Turbine

Abstract

Increasing the diffuser area as well as the negative back pressure at the diffuser exit was found profitable in the experiments. The present paper aims to find a theoretical demonstration of DAWT by using theoretical analysis based on one-dimensional analysis, mathematical models, assumptions, estimations and maximization of power coefficients and augmentation ratios. With a simple momentum theory, developed along the lines of momentum theory for bare windturbines, it was shown that power augmentation is proportional to the mass flow increase generated at the nozzle of the DAWT. Modeling and analysis of DAWT system were estimated and improved for determining the power coefficient and augmentation ratio by changing area ratio, diffuser efficiency, velocity ratio, turbine factor and pressure recovery. Referred to rotor power coefficients values of C p rotor =2.5 might be achievable according to theory, It was apparent that an optimal exit-area-ratio would depend upon economic arguments however; it appears unlikely that the exit-area-ratio would exceed a value around 3. Keyword: Diffuser flow; diffuser augmented wind turbine; theoretical demonstration; design and performance and one dimensional flow Diffuser Augmented Wind Turbine : . Diffuser Augmented Wind Turbine . DAWT . windturbines DAWT. DAWT Juma Alaydi . 2.5 = C 3 .