You have been asked to help with the low-pressure compressor (LPC) design for aturbofan engine with a bypass ratio of 8.4. The preliminary cycle design calls for theLPC to produce a pressure ratio of 9.4 with the following operating conditions andconstraints..Inlet ConditionsTO2PozCore Air MassFlowrate (kg/s) (K) (kPa)282 24.647.0Design ConstraintsMaximum PolytropicEfficiency94.1%MaximumStage Pr1.55Estimate the minimum number of stages required for this LPC. Then assuming the 1ststage of the LPC operates at the maximum allowable pressure ratio, determine thestagnation temperature exiting the 1st stage, and the stage's adiabatic efficiency. Alsodetermine the power (W) required to operate the full LPC (not just 1st stage). Finally,what would be the percent change in the required power if the polytropic efficiencywas only 90.0%.

To determine:(a) minimum number of stages required for LPC.(b) Stagnation temperature exiting the…

You have been asked to help with the low-pressure compressor (LPC) design for a turbofan engine with a bypass ratio of 8.4. The preliminary cycle design calls for the LPC to produce a pressure ratio of 9.4 with the following operating conditions and constraints. Inlet Conditions Core Air Mass Flowrate (kg/s) 47.0 To2 (K) Po2 (kPa) 282 24.6 Design Constraints Maximum Maximum Polytropic Stage Pr 1.55 Efficiency 94.1% Estimate the minimum number of stages required for this LPC. Then assuming the 1st stage of the LPC operates at the maximum allowable pressure ratio, determine the stagnation temperature exiting the 1st stage, and the stage's adiabatic efficiency. Also determine the power (W) required to operate the full LPC (not just 1st stage). Finally, what would be the percent change in the required power if the polytropic efficiency was only 90.0%.

You have been asked to help with the low-pressure compressor (LPC) design for a turbofan engine with a bypass ratio of 8.4. The preliminary cycle design calls for the LPC to produce a pressure ratio of 9.4 with the following operating conditions and constraints. Inlet Conditions Core Air Mass Flowrate (kg/s) 47.0 To2 (K) Po2 (kPa) 282 24.6 Design Constraints Maximum Maximum Polytropic Stage Pr 1.55 Efficiency 94.1% Estimate the minimum number of stages required for this LPC. Then assuming the 1st stage of the LPC operates at the maximum allowable pressure ratio, determine the stagnation temperature exiting the 1st stage, and the stage's adiabatic efficiency. Also determine the power (W) required to operate the full LPC (not just 1st stage). Finally, what would be the percent change in the required power if the polytropic efficiency was only 90.0%.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

You have been asked to help with the low-pressure compressor (LPC) design for a
turbofan engine with a bypass ratio of 8.4. The preliminary cycle design calls for the
LPC to produce a pressure ratio of 9.4 with the following operating conditions and
constraints.
.Inlet Conditions
TO2
Poz
Core Air Mass
Flowrate (kg/s) (K) (kPa)
282 24.6
47.0
Design Constraints
Maximum Polytropic
Efficiency
94.1%
Maximum
Stage Pr
1.55
Estimate the minimum number of stages required for this LPC. Then assuming the 1st
stage of the LPC operates at the maximum allowable pressure ratio, determine the
stagnation temperature exiting the 1st stage, and the stage's adiabatic efficiency. Also
determine the power (W) required to operate the full LPC (not just 1st stage). Finally,
what would be the percent change in the required power if the polytropic efficiency
was only 90.0%.

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Step 1: Determine the minimum number of stages

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Step 2: Calculate the design exit pressure

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Step 3: Calculate the minimum number of stages required (N)

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Step 4: Calculate the stagnation temperature

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Step 5: calculate the power required to operate LPC

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Step 6: Calculate the percent change in efficiency

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