please solve it i need urgent A naturally-aspirated (NA) oil engine (i.e., a slow-speed CI Engine) which produces one power pulse in two revolutions of its crankshaft is to be designed to operate with the following characteristic at sea level where the mean atmospheric conditions are Pa = 101325 N/m2 and ta = 17°C. The value of gas constant of air is Ra = 0.287 kJ/(kg·K). Gross brake power, Wb, gross = 300 kW Volumetric efficiency, hvol = 80% Brake specific fuel consumption, sfcb = 255 g/(kW·h) Actual air-to-fuel ratio, (A/F)act = (m a / m f )act = 17:1 Angular speed of the shaft, w = 125 rad/s Calculate: (i) The required engine capacity Vs, total in cc (cm3), as well as in litres (L); Vs is the swept volume, and (ii) the brake mean effective pressure ( Pbm ). The engine is fitted with a supercharger (SC) so that it may be operated at an al- titude, z, of 3000 m (above sea level) where the atmospheric pressure (Pa) in N/m2 is determined from the following relation: Pa = 101325´[1 - (2.25577 10-5 z)]5.25588 N/m2 The power taken by the supercharger Wb,SC is 7.5% of total or gross power pro- duced by the engine and temperature of air leaving the supercharger is 302 K. The air-fuel ratio (A/F) and brake thermal efficiency (hb, th ) remain same for su- percharged engine as when running without supercharger as in part (a) above, as does the volumetric efficiency. Calculate the increased air pressure required at the supercharger to maintain the net output of 300 kW.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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please solve it i need urgent

A naturally-aspirated (NA) oil engine (i.e., a slow-speed CI Engine) which produces one power pulse in two revolutions of its crankshaft is to be designed to operate with the following characteristic at sea level where the mean atmospheric conditions are P_a = 101325 N/m² and t_a = 17°C. The value of gas constant of air is R_a = 0.287 kJ/(kg·K).

Gross brake power, Wb, gross = 300 kW

Volumetric efficiency, h_vol = 80%

Brake specific fuel consumption, sfc_b = 255 g/(kW·h)

Actual air-to-fuel ratio, (A/F)_act = (m _a / m _f )act = 17:1

Angular speed of the shaft, w = 125

rad/s

Calculate: (i) The required engine capacity V_s, _total in cc (cm³), as well as in litres (L); V_s is the swept volume, and (ii) the brake mean effective pressure ( Pbm ).
The engine is fitted with a supercharger (SC) so that it may be operated at an al- titude, z, of 3000 m (above sea level) where the atmospheric pressure (P_a) in N/m² is determined from the following relation:

P_a = 101325´[1 - (2.25577 10^-5 z)]^5.25588 N/m²

The power taken by the supercharger Wb,SC

is 7.5% of total or gross power pro-

duced by the engine and temperature of air leaving the supercharger is 302 K. The air-fuel ratio (A/F) and brake thermal efficiency (h_b, _th ) remain same for su-

percharged engine as when running without supercharger as in part (a) above, as does the volumetric efficiency. Calculate the increased air pressure required at the supercharger to maintain the net output of 300 kW.

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