Calculate the isentropic efficiency of the compressor

Assignment Help Mechanical Engineering

Reference no: EM13710247

Air enters the compressor of a turbofan engine at –20°C and 60 kPa, with a flow rate of 95 kg/s and speed of 170 m/s. At the compressor exit, pressure is 1830 kPa, temperature is 455°C, and speed is 134 m/s. The aircraft is pitched up so that the centre of the compressor inlet is 100 mm higher than the centre of the outlet. 1.5% of the total flow of air is extracted from the compressor at a pressure of 880 kPa, temperature of 281°C, and low speed, for use in other aircraft systems.

a) Determine the mechanical power required to drive the compressor (state any assumptions clearly).

b) Calculate the percentage contributions of enthalpy, kinetic energy and potential energy to the compressor’s power requirement, and comment on the relative importance of these fractions.

c) Calculate the percentage of total power used to compress the extracted air. Why is this not simply equal to 1.5%?

d) Calculate the isentropic efficiency of the compressor, for air which flows through the main outlet.

Reference no: EM13710247

Questions Cloud

Consider a metal where the activation energy for vacancy : Consider a metal where the activation energy for vacancy formation is 0.95 eV/atom. At 1000 degrees C the fraction of vacancies in this material is:

Diffusion coefficient for zn in cu : At 500ºC the diffusion coefficient for Zn in Cu is 4.0E-18 m2/s. The activation energy for diffusion of Zn in Cu is 189 kJ/mol. Therefore at 700ºC, the diffusion coefficient for Zn in Cu is

Number of vacancies per cubic meter of manganese : Manganese has a density of 7.44 g/cm^3. Given that the activation energy for vacancy formation is 1.1 eV/atom, calculate the number of vacancies per cubic meter of Manganese at 1200 degrees C. The atomic weight of manganese is 54.94 amu.

Water expands upwards against a piston in vertical cylinder : A supply of steam at a pressure of 4 MPa and a temperature of 332°C (state 1) is used to do mechanical work as it expands to a pressure of 100 kPa and a quality of 90% (state 2). During the expansion process, 60 kJ/kg of heat is removed from the wate..

Calculate the isentropic efficiency of the compressor : Air enters the compressor of a turbofan engine at –20°C and 60 kPa, with a flow rate of 95 kg/s and speed of 170 m/s. At the compressor exit, pressure is 1830 kPa, temperature is 455°C, and speed is 134 m/s. The aircraft is pitched up so that the cen..

Discuss the current structure of the banking industry : Discuss the current structure of the banking industry. Compare and contrast today's structure versus historical structures - Why has consolidation occurred and who will experience benefits and losses - customers, the institutions, etc.

Determine the mass of potassium chloride required : Determine the mass of potassium chloride required to prepare a saturated solution in 50.0 mL of water at 40°C.

Decision of imposing fees on undeveloped plots : The Saudi government's long-awaited decision of imposing fees on undeveloped plots within cities, known as ‘white land - Discuss your thought in detail, and make it rich with information and arguments.

How could this relate to personality : In operant conditioning, how is shaping used to facilitate change in an organism's behavior? How could this impact personality?3.Do you agree with Bandura's belief that much of what individuals learn is acquired through observing others? Why or wh..

User Account

All Pages