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

See similar textbooks

Similar questions

2. An ideal Otto engine operating on the hot air standard with k = 1.34, has a compression ratio of 5. At the beginning of compression the volume is 6 cu ft, the pressure is 13.75 psi and the temp. is 100 °F. During the constant volume heating, 340 BTU are added per cycle. Find a. percent clearance b. T, с. Р, d. Efficiency е. Мер)
b) A single-acting, two-stage reciprocating air compressor runs at a speed of 500 rev/min with overall pressure ratio of 20 to 1 has free air delivery of 5.0 m3/min. For the first stage compressor, the pressure and temperature at the end of induction stroke is 100kPa and 27°C, respectively. The intermediate pressure is 500 kPa, and the intercooling process is complete. The clearance volumes of both stages are 5% of their respective swept volumes. The ambient pressure and temperature are at 100 kPa and 27°C, respectively. The index of compression and expansion, n is 1.3. i) Sketch the cycle on a P-V diagram. ii) Determine final delivery temperature of the compressor, C. iii) Determine totalindicated power, kw. iv) Determine volumetric efficiency for the first stage, %. v) Calculate the swept volume of the first and second stage, m2. Take the value of R for air is 0.287 kl/kg.K.
The Fifth Question: A six-cylinder, 4-stroke petrol engine develops 62 H.P at 3000 r.p.m. The volumetric efficiency at N.T.P. is 85%. The bore is equal to the stroke and thermal efficiency of 25 % may be assumed. Calorific value of petrol is 44100 kj/kg. Air-fuel ratio is to be 15:1. Calculate the cylinder bore and stroke.
Performance of a compressor needs to be analyzed. Air enters the compressor of an air- standard Brayton cycle at 100 kPa, 300 K, with a volumetric flow rate of 5 m/s. The turbine inlet temperature is 1400 K. The efficiency of the compressor is 70%. For compressor pressure ratios of 8, (draw layout and T-s diagram) analyze: a The themal efficiency of the cycle. b. Outline and compare the effect on cycle efficiency, if compression ratio is increased beyond 8? Dodecane (C1H26) burns completely with 150% of theoretical air. Analyze its performance on the basis of Air-fuel ratio on a molar and mass basis.
hi At the beginning of the compression process of an air standard Otto cycle, p1 = 1 bar, T1 = 300 K. The maximum temperature in the cycle is 2250 K and the compression ratio is 9.8. The engine has 4 cylinders and an engine displacement of Vd = 2.6 L. Determine per cylinder: Only letters d,e, and f needed a) the volume at state 1.b) the air mass per cycle.c) the heat addition per cycle, in kJ.d) the heat rejection per cycle, in kJ. - <e) the net work per cycle, in kJ. - <f) the thermal efficiency. - <
In a diesel engine, the compression starts at 11 pounds per square inch absolute (psia) and 111 degrees Fahrenheit. The compression ratio, denoted by rk, is 14.1, and fuel cut-off happens at 6% of the stroke. The engine is considered light-loaded, and the compression process follows a cold-air standard. You are asked to determine the state points in all corners of the cycle for a unit mass, find the mean effective pressure, and compute the air-standard efficiency.
A The compression ratio of a diesel cycle is 15.5, and the cutoff occurs at 10% of the stroke.14 psia and 600 K characterize state 1. Calculate the following for the hot-air standard with k= 1.34and a starting volume of 2 cu ft:a. Find T2 , P2 , V2 , T3 , V3 , P4 , and T4b. Compute the heat added (QA),heat rejected (QR), work (W) andthe cycle efficiency (e).c. for a rate of circulation of 1000 cfm,compute the horsepower.
A The compression ratio of a diesel cycle is 15.5, and the cutoff occurs at 10% of the stroke.14 psia and 600 K characterize state 1. Calculate the following for the hot-air standard with k= 1.34and a starting volume of 2 cu ft:a. Find T2 , P2 , V2 , T3 , V3 , P4 , and T4b. Compute the heat added (QA),heat rejected (QR), work (W) andthe cycle efficiency (e).c. for a rate of circulation of 1000 cfm,compute the horsepower. (full solution pls)
1.2 Estimate the loss in air standard efficiency for the diesel engine for the compression ratio 14 and the cut-off changes from 6% to 13% of the stroke. 1.3 The compression ratio of an air standard dual cycle is 12 and the maximum pressure on the cycle is limited to 70bar. The pressure and temperature of the cycle at the beginning of compression process are 1bar and 300K. Calculate the thermal efficiency and Mean Effective Pressure. Assume cylinder bore = 250mm, Stroke length = 300mm, Cp=1.005K J/Kg K, Cv=0.718KJ/Kg K. %3D
COMBUSTION ENGINEERING In an air-standard Otto cycle engine, the following data were obtained: k = 1.4 , C, = 1.0045 ,C, = 0.7175 , P1 = 103 kPa , t, = 26°C, t2 = 414°C, tz = 2527°C, kgK kg-K t4 = 945.8°C. To be done: a. Find the compression ratio r. A. 6,5 В. 7 C. 7.5 D. 8.0 E. None of these b. Find the pressure at the end of the compression stroke p2. А. 1804 КРа В. 1894 КРа С. 1994 КPа D. 2004 КРа c. Find the pressure at the end of heat addition. A. 7700 kPa B. 7719 kPa C. 8019 kPa D. 8800 kPa E. None of these d. Find the pressure at the end of the expansion stroke P4. A. 410 kPa В. 420 kPa C. 8019 kPa D. 460 kPa E. None of these e. Find the Heat added qa to the cycle, in kJ/kg air. A. 1615 kJ/kg C. 1555 kJ/kg E. None of these B. 1575 kJ/kg D. 1516 kJ/kg f. Find the work of the cycle wey, in kJ/kg air. A. 866.1- kg air B. 877.1 k) kg air C. 880.2- D. 900- E. None of these kg air E. None of these kg air Page 1 of 2 g. Calculate the cycle efficiency for the cycle, in percent. A. Ncy =…
A The compression ratio of a diesel cycle is 15.5, and the cutoff occurs at 10% of the stroke. 14 psia and 600 K characterize state 1. Calculate the following for the hot-air standard with k= 1.34 and a starting volume of 2 cu ft: Qin a. Find T2 , P2 , V2 , T3 , V3 , P4 , and T4 3 P = P, b. Compute the heat added (QA), Wout heat rejected (Qr), work (W) and the cycle efficiency (e). P. c. for a rate of circulation of 1000 cfm, Qout compute the horsepower.
Example dulmalek Air enters the compressor of an ideal air-standard Brayton cycle at 300K. the compressor ratio is 8 and the turbine inlet temperature is 1300K. Determine: a) The gas temperature at the exit of the compressor and the turbine. b) The back work ratio. c) c) The thermal efficiency. Assume the compressor efficiency of 80 percent and the turbine efficiency of 85 percent. d) The thermal efficiency of the gas-turbine power plant if generation having an effectiveness of 80 percent is installed. Shay