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95 4.3.3 Velocity Ratio, ππ Velocity ratio is the ratio between the rotor blade speed and the spouting velocity, as expressed by equation (β4-3). Spouting velocity πΆ0is the velocity obtained if the entire isentropic enthalpy drop is converted into speed, as expressed by equation (β4-4). π£π = π4 (β4-3) πΆ0 πΆ0 = 2βπππ (β4-4) Dixon and Hall [197] recommended that for the best turbine efficiency, the velocity ratio should fall in the range 0.68 β€ π£ β€ 0.71. 4.3.4 Degree of Reaction, πΉ Stage reaction is the ratio of static enthalpy drop at the rotor to the total enthalpy change across the stage, as expressed by equation(β4-5). Aungier [234] suggested that the stage reaction shouldfall in the range of 0.45 β€ π β€ 0.65 for enhancedturbine performance. π = π4βπ5 π01 β π05 4.3.5 Flow π and Loading Ρ° Coefficients (β4-5) Flow and loading coefficients are extensively used in axial turbines [232]. Flow coefficient π is a characteristic of the mass flow behaviour through the stage and defined as the ratio of the exit meridional velocity to the inlet blade speed. Loading coefficient Ρ° is a measure of the work and loading of the stage. Equations(β4-6)and (β4-7) present the flow and loading coefficients, respectively. π= πΆπ5 π4 (β4-6)PDF Image | Automotive Radial Turbine Expander Design WHR
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