The injected cooling-air is taken as mass sources distributed in the mixing region, on which the governing equations in hyperbolic conservative form has been derived for the three dimensional flow and the circumferent...The injected cooling-air is taken as mass sources distributed in the mixing region, on which the governing equations in hyperbolic conservative form has been derived for the three dimensional flow and the circumferentially averaged flow in air-cooled turbine cacscades.Based on the continuity equations of the gas flow and the mixed flow, a formula has been worked out to specify the density of the mass source. A high discrimination and high-orderaccuracy TVD scheme has been applied to solve the governing equations. Two numerical proof calculations have been done on an annular-cascade flow and a single-stage-turbine averaged flow, through which some influences of air injection are studied on the variation ofthe shock waves and turbine aerodynamic performace.展开更多
文摘The injected cooling-air is taken as mass sources distributed in the mixing region, on which the governing equations in hyperbolic conservative form has been derived for the three dimensional flow and the circumferentially averaged flow in air-cooled turbine cacscades.Based on the continuity equations of the gas flow and the mixed flow, a formula has been worked out to specify the density of the mass source. A high discrimination and high-orderaccuracy TVD scheme has been applied to solve the governing equations. Two numerical proof calculations have been done on an annular-cascade flow and a single-stage-turbine averaged flow, through which some influences of air injection are studied on the variation ofthe shock waves and turbine aerodynamic performace.
