Prototype Centrifugal Compressor Built Impeller 19 Vanes Backswept 2 30 Rotating 12 000 Rp Q29302927

A prototype centrifugal compressor is to be built with an impeller having 19 vanes backswept at 2-30, rotating at 12,000 rpm and delivering air at an outlet pressure of 385 kPa. The total-to- total efficiency of the compressor, based upon previous well-established design data, is estimated 16. as 0.82. It can be assumed that the radial component of the air leaving the impeller equals 0.2 times the impeller tip speed. The air enters the inlet axially at a stagnation temperature and pressure of 288 K and 100 kPa. Determine Gi) the impeller tip speed and tip diameter using the Wiesner slip factor (ii) the specific speed of the compressor assuming that the axial velocity at entry is equal to the radial component of velocity at impeller outlet. Comment upon whether the chosen value of the efficiency is appropriate. How well does the specific speed you have found compare with the values shown in Chapter 2?

A prototype centrifugal compressor is to be built with an impeller having 19 vanes backswept at 2-30, rotating at 12,000 rpm and delivering air at an outlet pressure of 385 kPa. The total-to- total efficiency of the compressor, based upon previous well-established design data, is estimated 16. as 0.82. It can be assumed that the radial component of the air leaving the impeller equals 0.2 times the impeller tip speed. The air enters the inlet axially at a stagnation temperature and pressure of 288 K and 100 kPa. Determine Gi) the impeller tip speed and tip diameter using the Wiesner slip factor (ii) the specific speed of the compressor assuming that the axial velocity at entry is equal to the radial component of velocity at impeller outlet. Comment upon whether the chosen value of the efficiency is appropriate. How well does the specific speed you have found compare with the values shown in Chapter 2? Show transcribed image text

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