7ENT1066 Advanced Engines and Power Systems Assignment – School of Engineering and Computer Science – University of Hertfordshire – UK
Assignment Title – Engine in-cylinder pressure analysis
Learning Outcomes –
Learning Outcome 1 – Explore alternative fuel properties and their use for advanced engines and power systems.
Learning Outcomes 2 – Analyse the performance of a variety of vehicle power units/systems and alternative vehicle fuels.
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Assignment Details –
Introduction – In this assignment you are given in-cylinder pressure data from a four-stroke single cylinder square engine using gasoline and E50 as shown in Table 1. Then, using the data the performance of these fuels needs to be compared to each other. The results are to be presented in a report and submitted to S.net. (Other operating parameters will be set: displacement volume: 148cc, compression ratio: 8.5, constant crank speed of 1800 rpm, conrod length: 62.5 mm, volumetric efficiency: 68%; stoichiometric condition for both fuels, ignition time 20 degrees BTDC.)
Table 1 A screen shot of a typical data set (5-45 degrees)
|
Angle(deg) |
Pressure(bar) |
|
5.000000 |
-5.670000 |
|
6.000000 |
-5.775000 |
|
7.000000 |
-5.775000 |
|
8.000000 |
-5.775000 |
|
9.000000 |
-5.775000 |
|
10.000000 |
-5.775000 |
|
11.000000 |
-5.775000 |
|
12.000000 |
-5.775000 |
|
13.000000 |
-5.791988 |
|
14.000000 |
-5.832357 |
|
15.000000 |
-5.775000 |
|
16.000000 |
-5.880000 |
|
17.000000 |
-5.775000 |
|
18.000000 |
-5.945261 |
|
19.000000 |
-5.784085 |
|
20.000000 |
-5.901569 |
|
21.000000 |
-5.775000 |
|
22.000000 |
-5.880000 |
|
23.000000 |
-5.985000 |
|
24.000000 |
-5.880000 |
|
25.000000 |
-5.915158 |
|
26.000000 |
-5.880000 |
|
27.000000 |
-5.906151 |
|
28.000000 |
-5.985000 |
|
29.000000 |
-5.967460 |
|
30.000000 |
-5.893115 |
|
31.000000 |
-5.923769 |
|
32.000000 |
-5.985000 |
|
33.000000 |
-5.985000 |
|
34.000000 |
-5.985000 |
|
35.000000 |
-5.985000 |
|
36.000000 |
-5.985000 |
|
37.000000 |
-5.985000 |
|
38.000000 |
-5.985000 |
|
39.000000 |
-5.985000 |
|
40.000000 |
-5.980341 |
|
41.000000 |
-5.985000 |
|
42.000000 |
-6.024032 |
|
43.000000 |
-5.985000 |
|
44.000000 |
-5.985000 |
|
45.000000 |
-5.985000 |
Report, article content –
Students expected to:
1. Create a research paper like document.
2. Compare the performance of gasoline and E50 (power output, Torque, SFC).
3. Show pressure curves with some analysis.
4. Obtain mass fraction burned curves.
5. Compare physicochemical properties of E50 and gasoline (ignition delay time and laminar flame speed).
The abstract – An abstract is a brief summary of a research article, thesis, review, conference proceeding or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper’s purpose. The abstract must be able to stand on its own: overall aim and some details must be given, at the end of it some of the main findings should be shown.
Introduction – Introduce the reader to the followings:
1. Why is the content of the paper is important (must support your statement with references.
2. What is that the methodology, questions, proves, argues…
3. Make your contribution clear, could be a separate short section (could be analytical type with hypothesis)
Results and discussion – These can be separated or presented together depending on personal preferences and on the topic. If it’s an experimental type report then evaluation of errors is vital. This can be done separately or together with the results.
Present your findings, discuss if these meet the expectations. It is important that you cross-compare the values with some already published values.
At a master level for marks over 70, it is expected that student carry out some advanced analysis this can include:
i. statistical analysis of data and correct presentation
ii. detailed analysis of p-V diagram: imep, bmep, fmep.
iii. Heat release rate calculation from pressure curves
iv. Mass fraction burned
Conclusions – When you write a paper, you always end by summing up your arguments and drawing a conclusion about what you’ve been writing about. The phrase in conclusion means “finally, to sum up,” and is used to introduce some final comments at the end of a speech or piece of writing. It usually starts with restating the main argument, add a brief description of methodology, show your results.
