Demonstration of Gasoline Engine Performance

Question: Explain some points which are as follows:(1) Draw a schematic diagram for the setup of the test system (2) Test Procedure: (a) Fix the engine speed at 2000 rpm, then gradually increase the engine torque output from 60 Nm to 140 Nm with a step of 20 Nm. Task: Record raw data, then fill required results in the table below after necessary calculations; Plot results into appropriate graph. Torque (Nm) Fuel flow* rate (g/s) Power (kW) BSFC** (g/kW.hr) Energy Efficiency Exhaust Temperature (ËÅ ¡C) 60 80 100 120 140 *Take the average reading of 10 seconds; **BSFC Brake Specific Fuel Consumption. (b) Fix the torque at 80 Nm, then increase engine speed from 1800 rpm to 3000 rpm (or from 2100 rpm to 3300 rpm) with a step of 300 rpm. Task: Record raw data, then fill required results in the table below after necessary calculations; Plot results into appropriate graph. Speed (rpm) Fuel flow* rate (g/s) Power (kW) BSFC** (g/kW.hr) Energy Efficiency Exhaust Temperature (ËÅ ¡C) 1800 2100 2400 2700 3000 3300 *Take the average reading of 10 seconds; **BSFC Brake Specific Fuel Consumption. (3) Discussion of relations between various operating and performance parameters (4) Conclusions Answer: (1) Schematic diagram for the setup of the test system Test System Engine Dynamometer Shaft Flywheel Exhaust pipe Dynamometer control unit Gas analyzer Fuel measurement system (2) Test Procedure (a)Fix the engine speed at 2000 rpm, then gradually increase the engine torque output from 60 Nm to 140 Nm with a step of 20 Nm. Task: Record raw data, then fill required results in the table below after necessary calculations; Plot results into appropriate graph. Torque (Nm) Fuel flow* rate (g/s) Power (kW) BSFC** (g/kW.hr) Energy Efficiency Exhaust Temperature (ËÅ ¡C) 60 1.410 753600 1.871 x 10 -6 0.01214 80 1.650 1004800 1.642 x 10 -6 0.01384 100 1.940 1256000 1.544 x 10 -6 0.01471 120 2.130 1507200 1.413 x 10 -6 0.01608 140 2.480 1758400 1.410 x 10 -6 0.01611 (*Take the average reading of 10 seconds; **BSFC Brake Specific Fuel Consumption.) Graph 1 : Graph for Torque Vs. Power Graph 2: Graph for Torque Vs. Energy Efficiency Graph 3: Graph for Power Vs. Energy Efficiency (b)Fix the torque at 80 Nm, then increase engine speed from 1800 rpm to 3000 rpm(or from 2100 rpm to 3300 rpm) with a step of 300 rpm. Task: Record raw data, then fill required results in the table below after necessary calculations; Plot results into appropriate graph. Speed (rpm) Fuel flow* rate (g/s) Power (kW) BSFC** (g/kW.hr) Energy Efficiency Exhaust Temperature (ËÅ ¡C) 1800 2100 1.715 1055040 1.625 x 10 -6 0.0139 2400 2.110 1205760 1.749 x 10 -6 0.0129 2700 2.430 1356480 1.791 x 10 -6 0.0126 3000 2.980 1507200 1.977 x 10 -6 0.0114 3300 3.530 1657920 2.129 x 10 -6 0.0106 *Take the average reading of 10 seconds; **BSFC Brake Specific Fuel Consumption Graph 1 : Graph for. Power Vs. Energy Efficiency Graph 2 : Graph for Speed Vs. Power Graph 3 : Graph for Fuel Flow Vs. Power (3) DISCUSSION Relations between operating parameters and performance parametersGasoline engine is also termed as petrol engine. It consists of internal combustion engine having spark ignition. It is designed and developed to run with gasoline or petrol and other fuels. Petrol engines are usually run on the two stroke or four stroke cycle. There are many parameters existing with the function and performance of the gasoline engine. The important parameters are brake power, which is measured at the flywheel. Brake power is the actual mechanical power output related to the engine. Power output is slightly dependent on the energy value of the fuel that has been using, humidity and ambient air temperature. So, while testing, the engines are usually rated at 250C and humidity considered is 50%. There are many other parameters for the engine, like the speed of the engine, torque, power, fuel flow, brake specific fuel consumption or BSFC, energy efficiency and exhaust temperature. Exhaust temperature or exhaust gas temperature is an important parameter of the gasoline engine. It has significant role to the function of the catalytic converted related to the internal combustion engine. It is measured with the help of the exhaust gas temperature gauge. (4) Conclusion In the gasoline engine performance, the total energy efficiency is measured by taking the engine speed as a fixed parameter. Fuel flow is measured for the varied torque and the final energy efficiency is calculated. And apart from that, torque is kept as a constant value and fuel flow is measured for varied engine speeds. By considering the input and output parameters, the overall graph is plot and shown. So, the demonstration of gasoline engine performance experiment is completed considering multiple parameters and calculating the energy efficiency accordingly. References Ioannis Gravalos, Dimitrois Moshou, Theodoros Gialamas, Panagiotis Xyradakis, Dimitrois Kateris and Zisis Tsiropoulos, Performance and Emission Characteristics of Spark Ignition Engine Fuelled with Ethanol and methanol gasoline blended fuels, Chapter 7, Intech Open Science, viewed on January 2015, "https://www.intechopen.com/books/alternative-fuel/performance-and-emission-characteristics-of-spark-ignition-engine-fuelled-with-ethanol-and-methanol-"https://www.intechopen.com/books/alternative-fuel/performance-and-emission-characteristics-of-spark-ignition-engine-fuelled-with-ethanol-and-methanol- Standard Support and And Environmental Impact Statement, Volume 1: Stationary Internal Combustion Engines, EPA-450/2-78-125a, U. S. Environmental Protection Agency, Research Triangle Park, NC, July 1979