(b)
Figure 6 Flow properties at mid-span for positions 0, 1, 2, 3,
4: a) Velocity; b) Static pressure
Figure 7 depicts the evolutions of static pressure around IGV vane and
rotor blade with different positions of frozen-rotor. The distribution
of static pressure on IGV blade looks in some extent similar for all
positions expect there are small variations at trailing edge. For the
rotor there are noticeable variations in pressure (loading) on both
sides of blade which become clearer beyond 60 % of chord and more
towards the blade trailing edge from both sides due to wakes
interaction. The wakes of different vanes traverse differently the
blades passages and are chopped into segments by the downstream blade
row, and do not periodically envelop the rotor blades and behave as a
negative jet impinging on the leading edge of blades, hence altering the
inlet flow angle and the boundary layers and subsequently the
aerodynamic loading of blades is drastically affected.