- Problem 1 A Straight Radial Centrifugal Compressor Is Designed To Provide A Pressure Ratio Of P03 P 01 2 8 The 1 (76.74 KiB) Viewed 39 times
Problem # 1 A straight radial centrifugal compressor is designed to provide a pressure ratio of (P03 / P-01 = 2.8). The slip factor is 0.85 and the compressor efficiency is 82%. If the outer radius of the impeller r2 = 0.1 m and the radial component of the velocity at the exit of the rotor is 120 m/s: a) Determine the rotating speed of the rotor. b) Determine the specific work required to drive the compressor. c) If the inlet total pressure is 100 kPa and the total temperature is 30 °C and the Hight of the impeller at the tip is h= 0.01 m, find the flowrate of air consider Cp = 1.02 kJ/kg. K and y = 1.4. assume constant total pressure in the diffuser. Problem # 2 The compressor in problem#1 is driven with a radial turbine on common shaft. Consider the air flow rate to be the same as for the compress find: a) the required impeller outer diameter for the turbine. b) The pressure ratio across the turbine if the inlet temperature is 650 °C and considering constant Cp = 1.12 kJ/kg.K and = 1.35. and the turbine efficiency is 87 %. c) If the required exit total pressure is to be 105 kPa, what would be the required inlet pressure?