Question
In: Mechanical Engineering
Imagine a diverging channel in place of the jet engine. Air enters the channel supersonically and...
Imagine a diverging channel in place of the jet engine. Air enters the channel supersonically and accelerates further in the diverging geometry. The exit velocity is an even faster jet which would provide thrust to the aircraft. In this design no energy is required in the form of combustion. Would this design work? If yes, why, and if not, why not? Use equations to explain your physics based arguments. You can use a quantitative example to make your point.
Solutions
samet mamat answered 2 years agoRelated Solutions
A jet propulsion engine has an air that enter the compressor at 100 kPa and 290K....
A jet propulsion engine has an air that enter the compressor at
100 kPa and 290K. The pressure ratio across the compressor is 14
and the turbine inlet temperature is 1500K. When the air leaves the
turbine, it enters the nozzle and expands to 100kPa. Determine the
pressure at the nozzle inlet and the velocity of the air leaving
the nozzle
Important notes: Please be neat and write legibly, it’s
important that I understand your writing and follow your thoughts....
1. Air enters a converging-diverging nozzle with a total pressure of 1100 kPa and a total temperature...
1. Air enters a
converging-diverging nozzle with a total pressure of 1100 kPa and a
total temperature of 127°C. The exit area to throat area
ratio is 1.8. The throat area is 5
cm2. The velocity at the throat is sonic and
the diverging section acts as a nozzle. Determine the
following:
a. The mass flow
rate
b. The exit pressure and
temperature
c. The exit Mach
number
d. The exit velocity
2. The converging-diverging
nozzle now has a throat area of 100 mm2 and an exit area
of 160...
Air passes through a jet engine nozzle operating at steady state. The flow at the nozzle...
Air passes through a jet engine nozzle operating at steady
state. The flow at the nozzle inlet has a temperature of 900° F.
The nozzle inlet has an area of 5 ft2. The flow at the nozzle
outlet has a temperature of 875° F, a specific volume of 90 ft3/lb,
and a velocity of 600 ft/s. The nozzle outlet has an area of 2 ft2.
Model the air as an ideal gas with constant specific heats.
Evaluate the specific heats...
The air mass flow rate of a jet engine is 10 kg/s. The stagnation enthalpy at...
The air mass flow rate of a jet engine is 10 kg/s. The
stagnation enthalpy at the exit of the turbine is 918 kJ/kg and the
excess air is 4.5.
(a) What should be the mass flow rate of fuel injected in the
afterburner, such that the stagnation enthalpy at the end of the
afterburner is 1700 kJ/kg?
(b) What is the excess air in the afterburner?
(c) What is the maximum temperature in the afterburner?
Air enters the diffuser of a ramjet engine at 22 kPa, 228 K and a velocity...
Air enters the diffuser of a ramjet engine at 22 kPa, 228 K and a
velocity of 920 m/s, decelerating to a negligible velocity at the
point at which heat is added. Using cold airstandard analysis with
constant specific heats at 300K, determine the following if the exit
pressure is 22 kPa and heat is added at 750 kJ per kg of air:
(a) The pressure at the diffuser exit, in kPa.
(b) The velocity at the nozzle exit, in...
Air enters the diffuser of a turbojet engine at 18 kPa, 216 K, with a volumetric...
Air enters the diffuser of a turbojet engine at 18 kPa, 216 K,
with a volumetric flow rate of 230 m3/s and a velocity
of 265 m/s. The compressor pressure ratio is 15, and its isentropic
efficiency is 87%. Air enters the turbine at 1560 K and the same
pressure as at the exit of the compressor. The turbine isentropic
efficiency is 89%, and the nozzle isentropic efficiency is 97%. The
pressure at the nozzle exit is 18 kPa. Use...
Imagine two fictional airline manufacturing companies, Nechako Jet and Air Fraser, are in a fierce competition...
Imagine two fictional airline manufacturing companies, Nechako
Jet and Air Fraser, are in a fierce competition to sell their
corporate jets. In 2019, Nechako’s “Brown Bear” has 1500 orders.
Fraser’s “Wolverine” has 1550 orders this year.
Background Data:
Aircraft
Price
Aircraft
Price
Nechako
Brown Bear
$19,000,000
Fraser
Wolverine
$18,500,000
Assumptions:
Assume that the performance and operating costs of the two
aircraft are the same.
At list price, both Nechako and Fraser can get another 200
orders each, and make 4...
Imagine two fictional airline manufacturing companies, Nechako Jet and Air Fraser, are in a fierce competition...
Imagine two fictional airline manufacturing companies, Nechako
Jet and Air Fraser, are in a fierce competition to sell their
corporate jets. In 2019, Nechako’s “Brown Bear” has 1500 orders.
Fraser’s “Wolverine” has 1550 orders this year.
Background Data:
Aircraft
Price
Aircraft
Price
Nechako
Brown Bear
$19,000,000
Fraser
Wolverine
$18,500,000
Assumptions:
Assume that the performance and operating costs of the two
aircraft are the same.
At list price, both Nechako and Fraser can get another 200
orders each, and make 4...
Imagine two fictional airline manufacturing companies, Nechako Jet and Air Fraser, are in a fierce competition...
Imagine two fictional airline manufacturing companies, Nechako
Jet and Air Fraser, are in a fierce competition to sell their
corporate jets. In 2019, Nechako’s “Brown Bear” has 1500 orders.
Fraser’s “Wolverine” has 1550 orders this year.
Background Data:
Aircraft
Price
Aircraft
Price
Nechako
Brown Bear
$19,000,000
Fraser
Wolverine
$18,500,000
Assumptions:
Assume that the performance and operating costs of the two
aircraft are the same.
At list price, both Nechako and Fraser can get another 200
orders each, and make 4...
Imagine two fictional airline manufacturing companies, Nechako Jet and Air Fraser, are in a fierce competition...
Imagine two fictional airline manufacturing companies, Nechako
Jet and Air Fraser, are in a fierce competition to sell their
corporate jets. In 2019, Nechako’s “Brown Bear” has 1500 orders.
Fraser’s “Wolverine” has 1550 orders this year. Background Data:
Aircraft Price Aircraft Price Nechako Brown Bear $19,000,000 Fraser
Wolverine $18,500,000 Assumptions: Assume that the performance
and operating costs of the two aircraft are the same. At list
price, both Nechako and Fraser can get another 200 orders each, and...
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