1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Degger [83]
3 years ago
11

Steam flows steadily through an adiabatic turbine. The inlet conditions of the steam are 4 MPa, 500°C, and 80 m/s and the exit c

onditions are 30 kPa, 92 percent quality, and 50 m/s. The mass flow rate of the steam is 12.6 kg/s. The properties of the steam are v1 = 0.086442 m^3/kg, h1 = 3446 kJ/kg, and h2 = 2437.7 kJ/kg. Determine:
a. the change in kinetic energy.
b. the power output.
c. the turbine inlet area.
Physics
1 answer:
FrozenT [24]3 years ago
8 0

Answer:

a) \Delta \dot K = 24.570\,kW, b) \dot W_{out} = 12729.15\,kW, c) A_{in} = 0.0136\,m^{2}

Explanation:

A turbine is a device which works usually in steady state and assumption of being adiabatic means no heat interactions between steam through turbine and surroudings and produce mechanical work from fluid energy. Changes in gravitational energy can be neglected. This system can be modelled after the First Law of Thermodynamics:

-\dot W_{out} + \dot m \cdot (h_{in} - h_{out}) + \frac{1}{2}\cdot \dot m \cdot (v_{in}^{2}-v_{out}^{2})   = 0

a) Change in kinetic energy

\Delta \dot K = \frac{1}{2}\cdot \dot m \cdot (v_{in}^{2} - v_{out}^{2})

\Delta \dot K = \frac{1}{2} \cdot \left(12.6\,\frac{kg}{s} \right) \cdot \left[\left(80\,\frac{m}{s} \right)^{2}-\left(50\,\frac{m}{s} \right)^{2}\right]

\Delta \dot K = 24570\,W

\Delta \dot K = 24.570\,kW

b) Power output

\dot W_{out} = \dot m \cdot (h_{in} - h_{out}) + \frac{1}{2}\cdot \dot m \cdot (v_{in}^{2}-v_{out}^{2})

\dot W_{out} = \left(12.6\,\frac{kg}{s}\right)\cdot \left(3446\,\frac{kJ}{kg} - 2437.7\,\frac{kJ}{kg} \right) + 24.570\,kW

\dot W_{out} = 12729.15\,kW

c) Turbine inlet area

Turbine inlet area can be found by using the following expressions:

\dot V_{in} = \dot m \cdot \nu_{in}

\dot V_{in} = \left(12.6\,\frac{kg}{s}\right) \cdot \left(0.086442\,\frac{m^{3}}{kg} \right)

\dot V_{in} = 1.089\,\frac{m^{3}}{s}

A_{in} = \frac{\dot V_{in}}{v_{in}}

A_{in} = \frac{1.089\,\frac{m^{3}}{s} }{80\,\frac{m}{s} }

A_{in} = 0.0136\,m^{2}

You might be interested in
Why are paperclips attracted to magnets? Group of answer choices They contain silver They contain aluminum They contain tin They
riadik2000 [5.3K]

Answer:

They contain iron.

Explanation:

Iron is made of metal and magnets attract to metal Iron.

5 0
3 years ago
A powerful motorcycle can produce an acceleration of 3.00 m/s2 while traveling at 90.0 km/h. At that speed the forces resisting
nata0808 [166]

Answer:

1185 N

Explanation:

From Newton’s second law of motion,  

F=ma where m= mass of motorcycle, a is acceleration of the motorcycle and F=Force

Net force acting on motorcycle F_{net} is given by  F_{net}=F-f

Where F is force acting on motorcycle and f is frictional force

Substituting F-f for F_{net}

F_{net}=ma hence  ma= F- f Substituting a with 3, m with 245Kg and f with 450N as provided

245*3= F- 450

F=245*3 +450= 1185 N

6 0
3 years ago
A train starts at v=10m/s and accelerates at 1m/s2 for 5s. Its final speed is *
ad-work [718]

Answer:

D) 15 m/s

Explanation:

v = u + at

v = 10 m/s + 1 m/s²(5 s)

v = 15 m/s

3 0
2 years ago
The rhinestones in costume jewelry are glass with index of refraction 1.50. to make them more reflective, they are often coated
nevsk [136]
What is he minumum coating of thickness needed to ensure that lifght of waveelntght 5660 mbnd si
7 0
3 years ago
The standard metric unit of density for a solid is
prisoha [69]
There is no SI "base unit" of density.
(Any unit of mass) divided by (any unit of volume) is
a valid unit of density.

The units of density that are seen most often are

(gram per cm³) and (kgm per meter³) .
5 0
3 years ago
Other questions:
  • How does Newton's three laws of motion apply to the egg drop project
    6·2 answers
  • What must be the acceleration of a train in order for it to stop from 12m/s in a distance of 541m?
    13·2 answers
  • What happens if a species is unable to adapt to a changing environment
    8·2 answers
  • Which planet has a ring system made of mostly water ice?
    7·2 answers
  • Define constant speed
    7·2 answers
  • A car is moving at high speed along a highway when the driver makes an emergency braking. The wheels become locked (stop rolling
    8·1 answer
  • An echo is a reflection of sound against another surface. Suppose you are standing on one side of a canyon and you
    8·1 answer
  • The national government would like to start a program that would give states money for flood relief. Which of the following stat
    15·1 answer
  • A boy pushes his baby sister in a stroller that has a mass of 45,000 g. What is the acceleration on the stroller if the force is
    7·1 answer
  • Estimate how long a 2500 W electric kettle would take to boil away 1.5 Kg of water . The specific latent heat of vaporization of
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!