IGTC-10 An Experimental Study of the Influence of Blade Curving on Centralized Vortices, Blade Loading and Losses(Session A-4 CASCADE PERFORMANCE)
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概要
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For the purpose of studing whether the crosswise secondary losses are reduced in a turbine stator cascade with a low aspect ratio by the use of the curvilinear lean blades, four sets of the rectangular cascades with the conventional straight blades and the curvilinear lean ones were tested in a low speed wind-tunnel. The aspect ratio of the tested cascades is 0.68. The selected lean angles of the curvilinear blades on the endwalls are 10°, 20°, and 30°, respectively. At different incidence the static pressure fields on the walls (blade surfaces and endwalls) and the cascade exit flow fields were measured with the static pressure measuring holes disposed on the walls and the five-hole bunched shaped probe. The results are presented in the form of the local parameter contours, the pitch-averaged loss distributions along blade height and the variations of the total losses with the lean angles and so on. Through the comparison of the results obtained for the conventional straight blades with those for the curvilinear lean blades, it is revealed that at any incidence blade curving forms the negative pressure gradients starting from both endwalls and reduces the crosswise pressure gradients on the endwalls. Thereby, the centralized vortices near the endwalls are weakened, and the blade loading there is also decreased. As a result, the crosswise secondary losses in both end-regions are cut down considerably.
- 公益社団法人日本ガスタービン学会の論文
著者
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Xu W.y.
Power Engineering Department Of Harbin Institute Of Technology
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Han W.j.
Power Engineering Department Of Harbin Institute Of Technology
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Wang Z.q.
Power Engineering Department Of Harbin Institute Of Technology