g 50 points) A non-afterburning turbojet is being designed for operation at an altitude of 15 km and a Mach number of 1.8. The maximum stagnation temperature at the inlet of the turbine is 1500 K. The fuel is a jet fuel having a LHV of 43124 kJ/kg and fst is 0.06. The following efficiencies apply at this Mach number: ηd =0.9 ηb =0.98 ηt =0.92 ηc =0.9 rb =0.97 ηn =0.98 Use a gamma value of 1.4 up to the burner, and a value of 1.3 for the rest of the engine. Assume R is 0.287 kJ/kgK throughout the engine. Plot the specific thrust, TSFC, ηth, ηp, and ηo as a function of rc, the total pressure ratio across the compressor. Is there an optimum rc that minimizes TSFC? Is there an optimum rc that maximizes specific thrust? Consider a range of rc from 2 to 60. Assume the exhaust is ideally expanded. Also plot the nozzle area ratio as a function of rc.

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nitially, the gas is at pressure p_0 ... The diagram shows several possible processes of expansion. ... unusual: They represent the relative change in pressure and in volume. Which of the curves in the figure represents an isothermal process? ... The ideal gas law states that pV = nRT . ... to the final volume R_{\rm v}V_0 .

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The p V-diagram above represents the states of an ideal gas during one cycle of ... During process A B, the volume of the gas increases from V. to 2V, and the gas ... of thermodynamics, determine the work performed by or on the gas during the ... Four samples of ideal gas are each initially at a pressure P. and volume V., ...

What are PV diagrams? (article) | Khan Academywww.khanacademy.org › ... › Laws of thermodynamics

A convenient way to visualize these changes in the pressure and volume is by using a ... As a gas goes through a thermodynamics process, the state of the gas will shift ... How do we determine the sign of the work done from a PV diagram? ... The work done during a thermodynamic process is equal to the area under the ...

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irreversible process that takes a system from an initial state i to a final state f is exactly equal to the entropy change S for any reversible ... volume Vf, the change S in the entropy of the gas is. (20-4). The Second Law of Thermodynamics This law, which is ... ergy extracted as heat from the low-temperature reservoir is con-.

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A diatomic gas initially at 18oC is compressed adiabatically to one eighth of its original ... 2k mol of hydrogen at NTP expands isobarically to twice its initial volume. ... 109MJ (d) 1.09 MJ When a system is taken from state i to state falong the path iaf, ... What will be the final pressure if an ideal gas in a cylinder is compressed ...

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adiabatic, constant volume, and constant pressure). Use the heat ... Point i in the figure below represents the initial state of an ideal gas at tempemture T. Taking.

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At state 1, the gas has volume 1.50 × 10–3 m3, pressure 1.02 × 105 Pa, and the ... The metal block is removed and the gas expands to state 4 still at 100° C. ... page 3. (c) Indicate below whether the process from state 2 to state 3 is isothermal, ... An ideal gas initially has pressure p0, volume V0, and absolute temperature T0.

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work is done on it and its temperature increases; in an adiabatic expansion, the ... where the compressions of the gas-air mixture take place so quickly that there is ... A quasi-static, adiabatic expansion of an ideal gas is represented in (Figure), ... ideal gas makes a quasi-static adiabatic transition from a state with pressure ...

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In terms of p0 and V0 calculate the work done by the gas in the process. b. In terms of p0 and V0 ... Four samples of ideal gas are each initially at a pressure Po and volume Vo, and a temperature To as shown on the diagram above. The samples are taken in separate experiment from this initial state to the final states I, II, III, ...

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An adiabatic expansion from pressure P0, volume V0 to a volume 2V0; ... and F (Helmholtz free energy) for a homogeneous system in term of U (internal energy) and the ... Find the net work done in the process in terms of P0, V0. 2. ... The van der Waals equation of state for a mole of gas is given by (P +a/V 2)(V −b) =.

Searches related to An ideal gas is taken from initial state i at pressure P0 and volume V0 to final state f at pressure 2P0 and volume 2V0. The figures below represent four possible processes by which the gas can be taken from state i to state f. For which process is the work done by the gas greatest?

work done by gas changing pressure and volume

pv diagrams

what is the work w done by the gas as it expands isothermally from v0 to fvv0?

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