- Example 8 2 Performance Data From The Cav Type 01 Radial Turbine Benson Cartwright And Das 1968 Operating At A Press 1 (202.77 KiB) Viewed 52 times
Example 8.2 Performance data from the CAV type 01 radial turbine (Benson, Cartwright, and Das 1968) operating at a pressure ratio poi/p3 of 1.5 with zero incidence relative flow onto the rotor is presented in the following form: m√/Toi/Pol [ = 1.44 × 10¯5, ms(K)¹/², N/√To1 = 2410, (rev/min)/K¹/2, T/Pol = 4.59 × 10-6, m³, where t is the torque, corrected for bearing friction loss. The principal dimensions and angles, etc. are given as follows: Rotor inlet diameter, 72.5 mm; Rotor inlet width, 7.14 mm; Rotor mean outlet diameter, 34.4 mm; Rotor outlet annulus height, 20.1 mm; Rotor inlet angle, 0°; Rotor outlet angle, 53°; Number of rotor blades, 10; Nozzle outlet diameter, 74.1 mm; Nozzle outlet angle, 80°; Nozzle blade number, 15. The turbine is "cold tested" with air heated to 400 K (to prevent condensation erosion of the blades). At nozzle outlet an estimate of the flow angle is given as 70° and the corresponding enthalpy loss coefficient is stated to be 0.065. Assuming that the absolute flow at rotor exit is without swirl and uniform and the relative flow leaves the rotor without any deviation, determine the total-to-static and overall efficiencies of the turbine, the rotor enthalpy loss coefficient and the rotor relative velocity ratio.