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turbine configuration for low-power organic Rankine cycle

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turbine configuration for low-power organic Rankine cycle ( turbine-configuration-low-power-organic-rankine-cycle )

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ACCEPTED MANUSCRIPT Stator o (throat width) α1 αβ2W WU S2 2 Rotor 3 3 (Blade velocity) b C2 U2Ω β3α3C3 Axial chord b Fig. 3. Schematic of blade passage for both axial and radial out-flow configurations. 3.2 Radial outflow turbine (ROT) design The specific work in the ROT is low compared with the AFT due to the reduction of the peripheral velocity through the expansion of the working fluid (U2 < U3) as illustrated in Fig. 3. The losses model of the AFT design (i.e. Table 3) is borrowed and applied in the PD of the radial-outflow turbine. Consequently, the equations (6,11,12,13) and Table 3 are used in the PD code of the ROT configuration. In this configuration, the distribution of the blade along the stage diameter is affected by the blade’s height and chord. The outlet section area and the stage diameter are calculated as follows (Casati et al., 2014): Assuming a rectilinear suction blade end-side, the relationship between blade geometric discharge angle and outlet width is calculated as: 𝑜 = 𝑆𝑐𝑜𝑠 (𝐵𝐷𝐴) (16) where BDA is a blade geometric discharge angle, equivalent to α2 and β3 in Fig. 3. The blade pitch (S) is calculated based on the following equation: 𝑆=𝜋𝐷𝑜𝑢𝑡 𝑁𝑏𝑙𝑑𝑠 (17) The blade height is calculated by rearranging equation (14) as: C1 𝐴𝑜𝑢𝑡 =𝐻𝑜𝑢𝑡𝑜=𝜌 𝑉 𝐷𝑜𝑢𝑡 = 𝐷𝑖𝑛 + 𝑏 𝑁 (14) (15) 𝑚 𝑜𝑢𝑡 𝑜𝑢𝑡 𝑏𝑙𝑑𝑠 11

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turbine configuration for low-power organic Rankine cycle

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