MAPUA INSTITUTE OF TECHNOLOGY School of Mechanical and Manufacturing Engineering Experiment No. 5 Diesel Engine Test Bed SN.13 – LALUSIS, JOHN VINCENT M. Performed: March 3, 2015 2010100951 Submitted: March 10, 2015 ME152L/B2 GROUP 3 ENGR. Teodulo A. Valle Instructor GRADE
TABLE OF CONTENTS A OBJECTIVES 1 B THEORIES AND ANALYSIS 1 C FORMULAS 2 D LIST OF APPARATUS 3 E PROCEDURE 4 F SET - UP APPARATUS 5 G FINAL DATA SHEET 6 H SAMPLE COMPUTATIONS 9 I TABLES 11 J TEST DATA ANALYSIS 12 K DISCUSSION 13 L QUESTIONS AND ANSWERS 49 M CONCLUSION 57 N RECOMMENDATION 58 O REFERENCES 59
A OBJECTIVES: 1 To familiarize the students with the diesel engine operation 2 To be able to know the basic principle behind the operation 3 To be able to calculate the different parameters of the Mechanical Engineering laboratory test Diesel Engine when subjected to varying loads 4 To be able to understand how the Engine Analyzer works 5 To familiarize the students with the operation and function of the Engine Analyzer B THEORY AND ANALYSIS: A diesel engine is a high compression internal combustion engine that depends upon the heat of compression for ignition. It is an engine that burns the fuel and the combustion gases released is used to drive the moving parts to produce power. It is also known as the compression-ignition engine primarily because it depends on high compression before the combustion took place. No spark plug needed during the process. In this cycle, the processes involved are: 1 Compression process – starting with the piston at the bottom dead center, heated air is compressed isentropically (reversible adiabatic) to a high temperature 2 Isobaric Heat Addition process – Heat is added at constant pressure. This process corresponds to fuel injection and burning the fuel inside the engine. The temperature after compression exceeds the fuel ignition temperature thereby the fuel ignites spontaneously upon injection into the combustion chamber. Since the expansion during this process, heat transfer must be sufficient to maintain the pressure constant. 3 Expansion process – The gas undergoes a reversible isentropic expansion process in which the pressure and temperature decrease. During this process, the piston moves downward from the top dead center position to bottom dead center position. 4 Isometric Heat Rejection process – Heat is being rejected at constant volume during this process, accompanied by a decrease of pressure and temperature.
C FORMULA: Indicated Mean Effective Pressure P mi = a x S / l Where: a = area of indicator card S = spring constant l = length of the card P mi = indicated mean effective pressure Indicated Power IP = P mi L s A N n c Where: L s = length of stroke A = piston area N = number of power cycles per minute = rotative speed /1 – for 2-stroke cycle = rotative speed /2 – for 4-stroke cycle n c = number of cylinders IP = indicated power Brake Power BP = 2 πn T = 2 π F R n Where: n = rotative speed of the shaft F = net load R = brake arm length T = torque BP = brake power
Mechanical Efficiency η = Brake power
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