Data from: A prediction model of compressor with variable geometry diffuser based on elliptic equation and Partial Least Squares

In order to fulfill more and more extensive intake air flow range of
diesel engine, variable geometry compressor (VGC) is introduced into
turbocharged diesel engine. However, due to the variable diffuser vanes
angle (DVA), the prediction for the performance of VGC becomes more
difficult than normal compressor. In the present study, a prediction model
comprised of elliptical equation and PLS (Partial Least Squares) model was
proposed to predict the performance of VGC. The speed lines of pressure
ratio map and efficiency map with elliptical equation were fitted, and the
coefficients of elliptical equation was introduced into PLS model to build
the polynomial relationship between the coefficients and relative speed,
DVA. And further, the maximal order of polynomical was detailed
investigated to reduce the number of sub-coefficients and acceptable fit
accuracy simultaneously. The prediction model was validated with sample
data and in order to present the superiority in compressor performance
prediction, the prediction results of this model were compared with those
of look-up table and BPNN. The validation and comparison results show that
the prediction accuracy of the new developed model is acceptable, and this
model is much more suitable than look-up table and BPNN under the same
condition in the VGA performance prediction. Moreover, the new developed
prediction model provides a novel and effective prediction solution for
VGC and can be used to improve the accuracy of the thermodynamic model for
turbocharged diesel engines in the future.