Abstract: The predicting formula of maximum instantaneous distortion are given in this paper. The comparison between estimated values and experimental results shows that the accuracy of estimation of the maximum value can be improved by considering the correlations between fluctuating pressures. The average relative error of the estimation for parameter (Kmax-Kss) can be reduced from 19.96% to 11.84%, and that for(K-Kss)and δK are respectively reduced from 28.16% to 12.33%, and from 11.37% to 5.43%, with consideration of the correlation between fluctuating pressures. The effects of the correlation coefficient between fluctuating pressures on the estimation of the maximum values are discussed in this paper. When the mean correlation coefficient, defined in this paper, is less than 0.1, at different condition the relative error of estimated values are less than 3%, the maximum value of instantaneous distortion can be estimated by an assumption of uncorrelated fluctuation pressures.

Key words: inlets, pressure distribution, estimates