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Demonstration Of Gasoline Engine Performance Add in library

37 Download4 Pages 900 Words

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 (ËšC)

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 (ËšC)

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 (ËšC)

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 (ËšC)

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 parameters 
Gasoline 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

  1. 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-
  2. 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
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