英语翻译In this section the simulations will be compared to the

英语翻译
In this section the simulations will be compared to the experimental results .This assessment will be made in terms of the noise source distribution in the rotor plane (Section 4,1) ,the rotor noise spectra (Section 4,2),and the overall noise levels as a function of rotor power(Section 4,3).
the measured and simulated source maps for both turbines are shown in Figure 3 to Figure 6.note that these source maps correspond to the upwind measurement position on the ground.the range of the colour scale is always 12 db,and the maximum is adjusted for each individual frequency band.The experimental source maps were averaged over all measurements,which were carried out for misalignment angles ά (see figure 1) around 00 and wind speeds (normalized to 10 m height ) between 6 and 10 m/s .the simulations were done for a misalignment angle of 00 and a wind speed close to the average experimental wind speed.
In general a very good qualitative agreement is ob served between experiments and simulations .as in the experiments ,the simulated source maps show dominant noise radiation from the outer part of the blades ,during their downward movement .similar frequency,which can be attributed to the thinner trailing edge boundary layer at higher radius .in some cases even the minor side-lobes (e.g.around “11 o’clock for 400-500 Hz in the GE results),which are an artifact of the array method,are reproduced in the simulations .obviously ,the minor experimental noise sources,at the nacelle and the tower ,are not reproduced in the simulation,because these are not simulated in the trailing edge noise prediction model.
For the GAMESA turbine ,the simulated source radius seems to be slightly higher than in the experiments.This may be due to the fact that the measured rotor had one tripped,one clean,and one untreated blade ,while he simulations are done for clean blades.Tripping results in a thicker trailing edge boundary layer ,so that the trailing edge noise at a given radius shifts to lower frequencies.