Question 2An aircraft engine operates on a simple ideal Brayton cycle with a pressure ratio of 10. Heat is addedto the combustion chamber producing air at 1700 K. The air passes through the engine at a rate of1 kg/s. The air at the beginning of the compression is at 70 kPa and 280 K. Using the variable specificheat approached, determine, for this engine,(a) the net power produced(b) the thermal efficiencyCompressor70 kPa280 KCombustionchamber1700 KⓇTurbine

The cycle is the Brayton cycle. The mass flow rate of air is m=1 kg/s The air at beginning of…

Answered: Question 2 An aircraft engine operates…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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A compression ratio of 8 is achieved by using an ideal air-standard Otto cycle engine. The working fluid has a pressure of 100 kPa and a temperature of 27°C at the start of the compression process, and the constant volume heat addition process supplies 800 kJ/kg of heat to the working fluid. What are the (a )the temperature, volume and pressure of the air at the end of each process (in K, m3 and kPa) (b) the net work output/cycle [kJ/kg], and (c) the thermal efficiency of this engine cycle
1. To approximate an actual spark-ignition engine consider an air-standard Otto cycle that has a heat addition of 1800 kJ/kg of air, a compression ratio of 7, and a pressure and temperature at the beginning of the compression process of 90 kPa, 10°C. Assuming constant specific heat, determine the maximum pressure and temperature of the cycle and the thermal efficiency of the cycle. 2. In an air standard Otto Cycle, air enters at 101.25Kpa and 36°C. The compression ratio is 4:1. If the network of the cycle is 125 KJ/Kg. Calculate the heat supplied in KJ/Kg. 3. An engine Operates on the air-standard Otto Cycle. The cycle work is 1050KJ/kg. What is the compression ratio of the engine if the maximum cycle temperature is 3176K and temperature at the end of isentropic compression is 950K?
First you selected a gas-turbine power plant operating on an ideal Brayton cycle and according to the manufacturing datasheets it has the following specifications:• A pressure ratio of 10. • Heat is added to the cycle at a rate of 500 kW• Air passes through the engine at a rate of 1 kg/s• The air at the beginning of the compression is at 70 kPa and 0 C.Task 1Investigate the principles of operation for a gas turbine power plant by considering the following:1. Construct T-S and P-V diagrams while discussing the operation of a gas turbine power plant2. Describe the difference between closed and open gas turbine engine3. Explain how a closed gas turbine engine would be combined with a steam power plant. 4. Explain why Brayton cycle is more preferred over Rankin cycle in power plant stations? And how would you enhance the performance of a Brayton cycle?
Consider a simple and ideal Brayton cycle operating with a pressure ratio of 8, where the air enters the compressor at 300 K and 100 kPa, while it enters the turbine at 1050 K. Assume speciﬁc heats are evaluated at 700 K. 1. Report the temperature at the inlet to the heat exchanger in K to one decimal place using rounding. 2. Report the amount of heat added to the cycle in kJ/kg to one decimal place using rounding. 3. Report the temperature after expansion in the turbine in K to one decimal place using rounding. 4. Report the amount of heat rejected by the cycle in kJ/kg to one decimal place using rounding. 5. Report the thermal efficiency as a percentage (0 to 100) to one decimal place using rounding.
An air standard diesel cycle has a compression ratio of 13 and a peak combustion temperature of 1681.55C. If the heat rejected by the engine amounts to 3kW, determine the theoretical output power that can be produced by the engine.a. 3.8552kW b. 3.8553kW c. 3.8551kW d. 3.8550kW
A spark ignition engine that operates on Otto cycle has a compression ratio of 10. At the beginning of the compression process, air is at 100 kPa and 25 C. 750 kJ/kg of heat is transferred to air duringthe constant-volume heat-addition process. Consider the variation of specific heats with temperature. 1)Describe with the aid of diagrams the operational sequence of four stroke spark ignition engines 2)Explain the mechanical efficiency for ideal otto cycle of two and four stroke engines
A spark ignition engine that operates on Otto cycle has a compression ratio of 10. At the beginning of the compression process, air is at 100 kPa and 25 C. 750 kJ/kg of heat is transferred to air duringthe constant-volume heat-addition process. Consider the variation of specific heats with temperature. Explain the mechanical efficiency for ideal otto cycle of two and four stroke engines?
The net work output and the thermal efficiency for the Carnot and the simple ideal Rankine cycles with steam as the working fluid are to be calculated and compared. Steam enters the turbine in both cases at 5 MPa as a saturated vapor, and the condenser pressure is 50 kPa. In the Rankine cycle, the condenser exit state is saturated liquid and in the Carnot cycle, the boiler inlet state is saturated liquid. Draw the T-s diagrams for both cycles.
3. An ideal Brayton cycle is used in a gas-turbine power plant with two stages of expansion and two stages of compression. Air enters each stage of the compressor and turbine at 17°C and 1067 °C, respectively. If the overall pressure ratio is 9.5, determine the efficiency of the cycle considering the variation of specific heat with temperature. O a. 37.2% Ob. 42% Oc. 36.8% O'd. 28.9% O e. 48.1%
An ideal Brayton cycle with regeneration has a pressure ratio of 8. Air enters the compressor at 300 K and the turbine at 1400 K. If the effectiveness of the regenerator is 100 %, determine: a- back work ratio,b- the net work output,c- the thermal efficiency of the cycle, andd- draw the p-v and T-s diagrams.Account for the variation of specific heats with temperature.
3. Show that the thermal efficiency of the Carnct cycle in terms of the isentropic compression ratio r is given by e = 1-1. k-1
An SI engine operates on an Otto cycle at 3800 RPM, with maximum cycle temperature andpressure of 3100 K and 7846 kPa. The engine has a compression ratio of 9.8:1, and immediately after combustion there is 0.000622 kg of exhaust gas in eachcylinder.During exhaustblowdown, the average mass flow rate through the single exhaust valve is 0.218 kg/sec. Atthe end of blowdown, cylinder pressure is reduced to exhaust pressure of 101 kPa.Calculate:(a) Temperature in cylinder at end of exhaust blowdown. [K](b) Mass of exhaust gas in cylinder at end of blowdown. [kg](c) Crank angle when exhaust valve opens. [° bBDC]

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