Internal Combustion Engine Performance Characterist ics Submitted To Dr Mark Ellis Submitted By MD MARUFUR RAHMAN Thermofluids and Turbomachinery Assignment 2011-2012 2 | P a g e Table of Contents 1.0 Introduction: ..................................... ................................................... ............................ 3 2.0 Question Section 1: ............................... ................................................... ....................... 3 2.1 Calculation and table for performance characteristi cs: ............................................... 3 3.0 Question Section 2: ............................... ................................................... ....................... 6 3.1 Performance characteristics Vs engine speed (rpm) G raphs:...................................... 7 3.1.1 Raw Torque Vs Engine Speed: ....................... ................................................... .. 7 3.1.2 Raw Power Vs Engine Speed: ........................ ................................................... .. 7 3.1.3 BMEP Vs Engine Speed: ............................. ................................................... ..... 8 3.1.4 SFC Vs Engine Speed: .............................. ................................................... ........ 9 3.1.5 AFR Vs Engine Speed: .............................. ................................................... ....... 9 3.1.6 Volumetric Efficiency Vs Engine Speed: ............ .............................................. 10 3.1.7 Brake Thermal Efficiency Vs Engine Speed: ......... ........................................... 10 3.1.8 Exhaust Temperature Vs Engine Speed: ............... ............................................. 11 4.0 Question Section 3: ............................... ................................................... ..................... 11 4.1 Corrected Measured Raw Torque and Raw Power: ...... ............................................ 11 4.1.1 Corrected Measured Raw Torque: .................... ................................................. 1 2 4.1.2 Corrected Measured Raw Torque Vs Engine Speed Graph : ............................. 12 4.1.3 Corrected Measured Raw Power: ..................... ................................................. 1 3 4.1.4 Corrected Measured Raw Power Vs Engine Speed Graph: ............................... 13 5.0 Question Section 4: ............................... ................................................... ..................... 14 5.1 Air Standard Cycle Efficiency: .................... ................................................... .......... 14 5.1.1 Test Engine Air Standard Cycle Efficiency: ........ .............................................. 14 5.1.2 Differences between Air Std Cycle efficiency and Th ermal efficiency: ........... 15 6.0 Question Section 5: ............................... ................................................... ..................... 16 6.1 Construct an Energy Balance diagram: ............... ................................................... ... 16 4.0 Conclusion: ....................................... ................................................... ......................... 17 5.0 References: ....................................... ................................................... .......................... 17 Thermofluids and Turbomachinery Assignment 2011-2012 3 | P a g e 1.0 Introduction: A single-cylinder 4-stroke SI engine was tested on an engine dynamometer at LSBU. Engine torque, fuel flow, airflow, and exhaust gas tempera ture were measured at 7 different engine speeds, all full-load (FT). However, the small inte rnal combustion engine is extensively used as a convenient and compact source of power such as cultivators, pumps, cement mixers and motor cycles. [1] Here I tried to address the ques