Homework Help is Here – Start Your Trial Now!
Engineering
Mechanical Engineering
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
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
See similar textbooks
icon
Related questions
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 (L) Shaft speed (N.) Mass flow rate of fuel used (rim, ) = 110 = 12 = 180000 rev/h = 166.67 g/min mm cm Brake power (W, ) = 40 kW = 44 = 2000 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 = 4 Atmospheric pressure (P.) Atmospheric temperature (ta) MJ/kg kJ/kg cmH2O = 1.01 = 23 bar °C Determine: (a) the brake thermal efficiency (7,th). (b) the brake mean effective pressure (Pom) , and (c) the volumetric efficiency (7ol.fme air cona) based on free air conditions. For air: R, = 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. NOTE: In the beginning of your Solution after Data, draw the actual P-v diagram for the engine per cycle and a simple schematic diagram of the test rig with the names of all the salient parts as well as the given property values properly labelled at appropriate locations near the parts. The marks allocated for P-v and schematic diagrams will be deducted if you do not draw these.
Transcribed Image Text: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 (L) Shaft speed (N.) Mass flow rate of fuel used (rim, ) = 110 = 12 = 180000 rev/h = 166.67 g/min mm cm Brake power (W, ) = 40 kW = 44 = 2000 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 = 4 Atmospheric pressure (P.) Atmospheric temperature (ta) MJ/kg kJ/kg cmH2O = 1.01 = 23 bar °C Determine: (a) the brake thermal efficiency (7,th). (b) the brake mean effective pressure (Pom) , and (c) the volumetric efficiency (7ol.fme air cona) based on free air conditions. For air: R, = 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. NOTE: In the beginning of your Solution after Data, draw the actual P-v diagram for the engine per cycle and a simple schematic diagram of the test rig with the names of all the salient parts as well as the given property values properly labelled at appropriate locations near the parts. The marks allocated for P-v and schematic diagrams will be deducted if you do not draw these.
Expert Solution
steps

Step by step

Solved in 2 steps with 1 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Compressible Flow
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Elements Of Electromagnetics
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY
SEE MORE TEXTBOOKS