The air flow through a four-cylinder, four-stroke gasoline engine was measured by means of a7.5-cm diameter accurate flow-measuring device with its discharge coefficient of 0.66. Duringa Power Plants laboratory trial on this engine the following data were noted down as follows:Bore (d)Stroke (Ls)Shaft speed (N.)Mass flow rate of fuel used (m,)Brake power (W,)= 110= 12= 180000 rev/h166.67 g/minmmст= 40kWMJ/kgkJ/kgHigher calorific value (HCV)Heat carried away by water vapours in the exhaust (qsteam)Pressure drop across the measuring device (Ahw), by a water manometerAtmospheric pressure (P.)Atmospheric temperature (ta)442000cmH2Obar°C1.01= 23Determine:(a) the brake thermal efficiency (7, th),(b) the brake mean effective pressure (P m), and(c) the volumetric efficiency (nvol.e air cond) based on free air conditions.For air: Ra = 0.287 kJ/(kg-K) and the mass density if water, P =987kg/m³ and the local accel-eration due to gravity, g = 9.79 m/s².4.

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The air flow through a four-cylinder, four-stroke gasoline engine was measured by means of a 7.5-cm diameter accurate flow-measuring device with its discharge coefficient of 0.66. During a Power Plants laboratory trial on this engine the following data were noted down as follows:

The air flow through a four-cylinder, four-stroke gasoline engine was measured by means of a 7.5-cm diameter accurate flow-measuring device with its discharge coefficient of 0.66. During a Power Plants laboratory trial on this engine the following data were noted down as follows:

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

The air flow through a four-cylinder, four-stroke gasoline engine was measured by means of a
7.5-cm diameter accurate flow-measuring device with its discharge coefficient of 0.66. During
a Power Plants laboratory trial on this engine the following data were noted down as follows:
Bore (d)
Stroke (Ls)
Shaft speed (N.)
Mass flow rate of fuel used (m,)
Brake power (W,)
= 110
= 12
= 180000 rev/h
166.67 g/min
mm
ст
= 40
kW
MJ/kg
kJ/kg
Higher calorific value (HCV)
Heat carried away by water vapours in the exhaust (qsteam)
Pressure drop across the measuring device (Ahw), by a water manometer
Atmospheric pressure (P.)
Atmospheric temperature (ta)
44
2000
cmH2O
bar
°C
1.01
= 23
Determine:
(a) the brake thermal efficiency (7, th),
(b) the brake mean effective pressure (P m), and
(c) the volumetric efficiency (nvol.e air cond) based on free air conditions.
For air: Ra = 0.287 kJ/(kg-K) and the mass density if water, P =987kg/m³ and the local accel-
eration due to gravity, g = 9.79 m/s².
4.

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