--%>
Assignment Help - homework help

Change of power in flow of kinetic energy

Air at 20 m/s, 260 K, 75 kPa with 5 kg/s flows into a jet engine and it flows out at 500 m/s, 800 K, 75 kPa. What is the change (power) in flow of kinetic energy?

E

Expert

Verified

m.ΔKE = m.1/2(V2e–V2i)

= 5 kg/s×12 (5002 – 202) (m/s)21

1000 (kW/W) = 624 kW

You can consider air and in these condition the first term of the equation will be cancelled out as there will be no role of enthalpy.

Above is an e.g. Of similar question

The only consideration is of Potential energy and kinetic energy and in the question no mass flow rate is given

PV = RT
V = RT/P =8.314*(100+273)/100 =31.0122

Mass Flow Rate, m = V/v = 31.0122/90=.34456

The continuity Equation
(Ve2 –Vi2)/2 +g(Ze - Zi)=(Q +W)/m

Also Q = 0

Putting all the values and soling we get

W=1391.17 kw

   Related Questions in Mechanical Engineering

  • Q : Maintenance in Product design

    Maintenance: How frequently and easily the product is to be maintained must be specified. A photocopier shouldn't require a service call from a technician just to add toner. If the product is to be maintenance free, then costs may be increased due to

    		•
  • Q : Mechanical Systems Reliability -

    Mechanical Systems Reliability, MP3701 Your assignment must be submitted electronically via eLe

    		•
  • Q : Excitation of Modes in Fiber A

    A multimode fiber is used to couple light into a single mode fiber. Both fibers have the same total diameter. Explain the coupling. Use equations, MATLAB, etc. if necessary. If an LED is used to excite a single mode fiber, explain the coupling of light to the fiber? U

    		•
  • Q : Servo drive What do you mean by Servo

    What do you mean by Servo drive and how mechatronic integration approach is improved by it.

    		•
  • Q : Problem on discharge of water In the

    In the below system, d = 6 in., D = 12 in., Δz1 = 6 ft, and Δz2 = 12 ft. The discharge of water in the given system is 10 cfs. Is the machine a turbine or a pump ? Determine the pressures at points A and B? Neglect head losses. Suppos

    		•
  • Q : Bernoulli's equation From Bernoulli's

    From Bernoulli's equation we know that presure head + velocity head at inlet and outlet header is same. If so  what is ' W' then in the equation ?

    		•
  • Q : Petroleum technology theories for the

    theories for the origin of petroleum, methods for detection of petroleum deposits, fractional distillation

    		•
  • Q : Brazing and Welding Differentiate the

    Differentiate the term Brazing and Welding?

    		•
  • Q : Powder Technology Explain the term

    Explain the term Powder Technology?

    		•
  • Q : Problem related to mass flow rate Water

    Water flows via a control volume as illustrated in the figure below. At Section (1) the diameter is 40 mm and the velocity profile is given by the V(r) = 10 (4 – r2) m/s, here r is the  distance from the centerline. At Section (2) the mass flow r

    		•