Air enters the diffuser of a turbojet engine at 18 kPa, 216 K,
with a volumetric flow rate of 230 m^{3}/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 an air-standard
analysis.

a)

Determine the rate of heat input to the combustor, in MW.

In: Mechanical Engineering

Cryogenic engineering.

Theoretically investigate the performance of zeiner
liquefaction system using inline helical and spherical tube
arrangements...

Model the system and list all the variables related to it....Also
study the efffect of varying outside conditions and inside
conditions...

validate the results using scilab and Fortran 77...

please answer if u can otherwise skip it

don't waste my question quota....please

In: Mechanical Engineering

function and working principle of the component of the hydraulic power steering system with diagram. and kindly it's good if you send me a pdf or a book that briefly explains

In: Mechanical Engineering

7 mm çaplı 26 mm uzunluğundaki çelik tel, ön gerilmeli beton üretiminde kullanılmaktadır. P çekme kuvveti uygulandığında, telin 65 mm uzadığı görülmektedir. E=200 GPa olduğuna göre, a) P kuvvetinin büyüklüğünü b) telde oluşan gerilmeyi hesaplayınız. (7X2=14p)

In: Mechanical Engineering

a-Calculate conventional yield effort at 0.2% (0.002 in./in.)

b- Tensile strength.

c- The modulus of elasticity.

d- Elongation

e- The reduction in area.

f- The engineering effort to fracture

g- The real stress to fracture

h- The modulus of resilience

Magnesium

Load (N) | Calibrated length (mm) |

0 | 30.00000 |

5000 | 30.02960 |

10000 | 30.0592 |

15000 | 30.0888 |

20000 | 30.1500 |

25000 | 30.51 |

26500 | 30.9 |

27000 | 31.5 |

26500 | 32.1 |

25000 | 32.79 |

- Initial diameter of the test tube: 12 mm

- Initial calibrated length: 30 mm

- Calibrated length after fracture: 32.61 mm

- Diameter after fracture. 11.74 mm

In: Mechanical Engineering

Write short notes on the following, illustrating your answers
with neat sketches wherever necessary:

1- Effect of supersaturated flow in steam nozzles, and

2- Steam injector.

In: Mechanical Engineering

An aluminum plate with a thickness of 2L=0.22m is initially at a temperature of To=250°C. The plate is suddenly brought into contact with a fluid at a temperature of T∞=50°C, where the convection heat transfer coefficient is h=500 W/ m2K. Determine

a. the mid-plane temperature at t=300 seconds.

b. the total heat transfer from the plate to the fluid in 300 seconds if the surface area of one side of the plate is 1 m2 .

In: Mechanical Engineering

3. What is the just-in-time (JIT) manufacturing? How to achieve it? How does it impact facilities design? (15 pts)

In: Mechanical Engineering

In the planetary gear train shown in Figure Q2, the annulus A rotates at 300 rpm about the axis of fixed wheel S which has 80 teeth. The armed spider (arm) is driven at 180 rpm. The annulus is connected to input shaft whereas the arm is connected to the output shaft. If the efficiency of gear system is 98% and input torque is 100 Nm, identify the following information regarding these problems (i) The number of teeth on planet gear, P (ii) Holding torque for fixed wheel (iii) Power transmitted by the gear train.

In: Mechanical Engineering

The indoor temperature of an oven can go up to 250 degrees
Celsius. There is a 2 mm thick sheet metal material inside and
outside of the oven wall. There is a 10 mm insulation material
between the oven wall. It is desirable that this temperature should
not exceed 30 degrees Celsius in order not to damage the outside of
the oven by hand. Find the amount of heat (W) discharged from the
furnace unit area and unit time and the energy consumed if the
furnace operates for 2 hours.

k_Insulation = 0.0.35 W / m.K

k_sheet metal = 40 W / m.K

h = 25 W / m ^ 2.K

In: Mechanical Engineering

Sketch and label the following thermodynamic processes on enthalpy-temperature or internal energy-temperature diagrams (as appropriate). Use a separate diagram for each case. Clearly label reactant and product conditions on each diagram as well as the direction of the process path. For each process, specify (a) what initial conditions/inputs must be provided, (b) what resulting reaction quantity of interest can be calculated, (c) what thermodynamic constraints/assumptions apply, and (d) why you chose each diagram as well as why you drew each process path.

CASE 1: reaction occurring within a bomb calorimeter

CASE 2: reaction occurring in a highly conductive, non-insulated piston/cylinder

CASE 3: reaction associated with ideal combustion event in an Otto engine

CASE 4: reaction associated with ideal combustion event in a Diesel engine

In: Mechanical Engineering

Q/A coal sample has 90% carbon, 3.3% hydrogen, 3% oxygen, 0.8% nitrogen. 0.9% sulphur and 2% ash. For 50% excess air supply determine percentage composition of dry flue gases by volume and minimum oxygen required.

In: Mechanical Engineering

A 3-kg mass is attached to the end of a coil spring with stiffness k=48N/m . The mass is then pulled down 0.5m (from its equilibrium position) and released at t = 0 with an initial velocity of 2 m/sec directed upward. Neglect the resistance of the medium. a) Determine the resulting displacement and velocity as functions of time. b) Find amplitude, period and frequency of the motion. c) At what time does the weight first pass through the equilibrium position?

In: Mechanical Engineering

Water (cp=4179 J/kg·K) at 30 °C flows on the inside of a steel tube with 25 mm inner diameter and 0.4 mm wall thickness at a flow rate of 0.4 kg/s. The tubes forms inside of a counter flow double pipe heat exchanger. Engine oil at 100 °C flows in the annular space with a flowrate of 0.1 kg/s. The outlet temperature of the oil is 60 °C. The material of the heat exchanger is carbon steel with k=45 W/m·K. The inner diameter of the outer tube is 55 mm. If the length of a hairpin is 5m, calculate the number of hairpins ignoring the fouling resistances.

please can you help me course name heat exchangers.

In: Mechanical Engineering

Air enters the compressor of an ideal cold air-standard Brayton
cycle at 100 kPa, 300 K, with a mass flow rate of 6 kg/s. The
compressor pressure ratio is 10, and the turbine inlet temperature
is 1400 K.

For *k* = 1.4 and *C*_{p} = 1.005 kJ/kg,
calculate:

(a) the percent thermal efficiency of the cycle.

(b) the back work ratio.

(c) the net power developed, in kW

In: Mechanical Engineering