Modeling and dynamic analysis of the performance of diffuser augmented wind turbine

Abstract EN

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 wind turbines, 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 Cp 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.