Wennerstrom and Puterbaugh (1984) presented a model for predicting the shock loss in a compressor blade row that took into account the three-dimensionality of the shock surface. Both the measured data and the numerical solution show that the shock surface is almost normal to the relative flow on each S_1 stream surface near the design flow condition. The shock surface is oblique in the spanwise' direction because of the sweep of the blade. Under the invisid flow condition, Wennerstrom and Puterbaughassumed that the three-dimensional shock intersects the outer casing obliquely in the spanwise direction. The hypothesis is untenable because of the complex interaction of the shock and boundary layer in the vicinity of tip section.
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