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Journal Articles
Article Type: Research Papers
J. Turbomach. May 2023, 145(5): 051007.
Paper No: TURBO-22-1225
Published Online: November 25, 2022
Journal Articles
Journal Articles
Journal Articles
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Notation for impeller outlet velocity triangle with deviation angle and sli...
Published Online: November 25, 2022
Fig. 1 Notation for impeller outlet velocity triangle with deviation angle and slip (slip coefficient defined as σ = c s / u 2 ) More
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Work coefficient versus exit flow coefficient showing the degree of reactio...
Published Online: November 25, 2022
Fig. 2 Work coefficient versus exit flow coefficient showing the degree of reaction, flow angles, and the exit velocity triangle for an impeller with ϕ 2 = 0.25 and λ = 0.6 More
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The  λ − ϕ  2  diagram adapted to show the relative velocity triangles at t...
Published Online: November 25, 2022
Fig. 3 The λ − ϕ 2 diagram adapted to show the relative velocity triangles at the hub and casing inlet and the impeller exit More
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Visualization of the slip coefficient, the blade exit angle, the deviation ...
Published Online: November 25, 2022
Fig. 4 Visualization of the slip coefficient, the blade exit angle, the deviation and the minimum pinch required to achieve 65 deg inlet angle for a vaneless diffuser for an impeller design with ϕ 2 = 0.234, λ = 0.72, and α 2 = 72 deg More
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Contours of the non-dimensional impeller outlet width parameter and absolut...
Published Online: November 25, 2022
Fig. 5 Contours of the non-dimensional impeller outlet width parameter and absolute exit flow angle with no blockage for a fixed tip-speed Mach number of M u 2 = 1.2 More
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Design points of work coefficient versus flow coefficient of vaneless diffu...
Published Online: November 25, 2022
Fig. 6 Design points of work coefficient versus flow coefficient of vaneless diffuser stages More
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Design points of work coefficient versus flow coefficient of vaned diffuser...
Published Online: November 25, 2022
Fig. 7 Design points of work coefficient versus flow coefficient of vaned diffuser stages More
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Work coefficient versus flow coefficient showing how the degree of reaction...
Published Online: November 25, 2022
Fig. 8 Work coefficient versus flow coefficient showing how the degree of reaction and absolute flow angle change as the impeller moves off-design More
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Work coefficient versus flow coefficient operating lines calculated from pe...
Published Online: November 25, 2022
Fig. 9 Work coefficient versus flow coefficient operating lines calculated from performance maps with contours of absolute impeller outlet velocity, c 2 /u 2 , and lines of constant absolute flow angle More
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Sketch of the numerical domains. Dashed lines belong to the computational d...
Published Online: November 25, 2022
Fig. 1 Sketch of the numerical domains. Dashed lines belong to the computational domain for the cylinder (Ω c ), solid lines to that for the turbine blade (Ω b ). No-slip boundary conditions are imposed along the black lines, periodic conditions along the magenta lines, inlet Dirichlet conditi... More
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Axial velocity profiles at  z  = 0.0 and  x  = −0.2 and  t  = { t  0 ,  t 0...
Published Online: November 25, 2022
Fig. 3 Axial velocity profiles at z = 0.0 and x = −0.2 and t = { t 0 , t 0 + 0.25 T , t 0 + 0.5 T , t 0 + 0.75 T }. The profiles are shifted according to u k = u + 1.5 ( k − 1). Black lines represent the velocity extracted from the turbine domain, and magenta lines represent ... More
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( a ) Absolute value    |     U  ¯     |    and     U       rms         at ...
Published Online: November 25, 2022
Fig. 4 ( a ) Absolute value | U ¯ | and U rms at x = −0.2 and ( b ) spanwise spectrum at x = −0.2 and positions of max ( u ^ rms ) ( y = 0.779, black) and the scaled von Kármán spectrum (blue) More
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( a ) Pressure coefficient and ( b ) wall shear stress distribution for the...
Published Online: November 25, 2022
Fig. 5 ( a ) Pressure coefficient and ( b ) wall shear stress distribution for the homogeneous-turbulence (blue) and moving bars case (red). Solid lines are used for the suction side, and dashed lines for the pressure side. More
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Mean tangential velocity profiles on the suction side of the blade for homo...
Published Online: November 25, 2022
Fig. 6 Mean tangential velocity profiles on the suction side of the blade for homogeneous-turbulence (blue) and moving bars case (red). The profiles are shifted according to u ¯ ξ k = u ¯ ξ + k with k = 1, 2, …, 8. The profiles are extracted at x ∈ {0.2, 0.5,... More
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First row: blade-to-blade view of the axial velocity perturbation field,   ...
Published Online: November 25, 2022
Fig. 7 First row: blade-to-blade view of the axial velocity perturbation field, u ^ . Second row: tangential velocity perturbation field, u ^ ξ , at wall normal distance η = 0.005. From left to right, the time increases as t ∈ { t 0 , t 0 + 0.25 T , t 0 + 0.5... More