Aji, Aryo Prastyo (2018) Analisa dan Pengaruh Swirl Number pada Conical Quarl Swirl Burner pada Jenis Partially Premixed Combustion Dengan Menggunakan Model Large-Eddy Simulations. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Emisi NOx dengan kriteria ultra low sangat diharapkan pada pembakaran turbin gas. Penerapan pembakaran dengan model non-premixed flame banyak digunakan karena model pembakaran ini memiliki stabilitas dan pengendalian yang baik. Tetapi, pembakaran jenis ini memiliki beberapa kekurangan diantaranya terdapat emisi jelaga dan NOx. Dipasangnya swirling injectors yang dapat difungsikan untuk mengoptimalkan pencampuran antara bahan bakar dan udara, dengan optimalnya pembakaran sehingga dapat mengurangi polutan yang dihasilkan. Penelitian ini menggunakan penerapan konsep Partially Premixed Combustion dan pengaruh dari swirl number pada ruang pembakaran. 4 variasi utama swirl number yang masing-masing variasi memiliki 3 subvariasi equivalence ratio dengan nilai equivalence ratio sebesar 1,6, 1,97, dan 2,4 Variasi swirl number dengan interval antar variasi nilai swirl number sebesar 0.1. Disemua reaksi pembakaran terjadi penurunan temperature yang signifikan dengan rata-rata penurunan sebesar 1782,645 K. Perbedaan nilai swirl number berpengaruh terhadap perubahan temperature tetapi pengaruh swirl number berfluktuasi dengan pola perubahan naik turun temperature yang cenderung sama. Dengan temperature maksimum terdapat pada swirl number 0,57 pada equivalence ratio 1,6 dan 1,97 sedangkan pada equivalence ratio 2,4 memiliki temperature maksimum pada swirl number 0,77. Dengan flame stagnation point maksimum terdapat pada swirl number 0,57 pada equivalence ratio 1,6 yaitu disekitar 0,05856 m. Pengaruh pollutan NOx terhadap swirl number disetiap equivalence ratio didapat bahwa pola meningkat dan turunnya nilai polutan disetiap swirl number sama dengan pola naik turunnya nilai temperature di setiap swirl number. Pollutan NOx didapat maksimum pada equivalence ratio 1,6 dengan swirl number 0,57 dan terjadi perbedaan nilai pollutan yang signifikan dimana pada equivalence ratio 1,97 dan 2,4 memiliki nilai jauh lebih rendah. Pembakaran paling sempurna dengan rendahnya nilai swirl number yaitu pada swirl number 0,77 pada equivalence ratio 1,97 dan 2,4. Sedangkan, pada equivalence ratio 1,6 terdapat perbedaan dimana pembakaran dengan fraksi massa CO paling rendah terdapat pada swirl number 0,57 dan dapat dikatakan pembakaran paling sempurna pada equivalence ratio 1,6 yaitu swirl number 0,57. Kata Kunci : Partially Premixed Combustion , Temperature, Emisi NOx, Swirl Number.
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NOx emissions with ultra-low criteria are desirable for combustion of gas turbines. Application of combustion with non-premixed flame model is widely used because this combustion model has good stability and control. However, this type of combustion has several disadvantages including soot emissions and NOx. Installation of swirling injectors that can be enabled to optimize the mixing of fuel and air, with optimal combustion to reduce the pollutant produced. This study uses the application of the concept of Partially Premixed Combustion and the influence of swirl number on the combustion chamber. 4 main variations of swirl number each variation has 3 subvariations equivalence ratio with equivalence ratio value equal to 1,6, 1,97, and 2,4 variation of swirl number with an interval between a variation of the value of swirl number equal to 0,1. In all combustion reactions, there was a significant decrease in temperature with an average decrease of 1782,645 K. There was a similarity in the decrease in the value of the temperature in all equivalence ratios of swirl number 0.57 to 0.67. The different swirl number values associated with the temperature and influence of the swirl numbers fluctuate with the rising parameters being the same temperature. With maximum temperatures found on the swirl number of 0.57 on the equivalence ratio of 1.6 and 1.97 whereas in the 2.4 equality ratio has the maximum temperature at the swirl number of 0.77. With the maximum flame stagnation point is found on the swirl number of 0.57 at the equivalence ratio of 1.6 which is located 0.05856 m. An indicator of NOx pollution on swirl number in each equivalence ratio shows that the pattern of rising and fall of pollutant value in each swirl number is similar to the pattern of fluctuation of the temperature value in each swirl number. NOx Pollutant obtained a maximum comparison on equality of 1.6 with swirl number 0.57 and the occurrence of significant pollutant prices in the ratio of equality of 1.97 and 2.4 has a much lower value. The most perfect burning with the low swirl number is swirl number 0.77 at the 1.97 and 2.4 equivalence ratios. Whereas, in the equivalence ratio 1.6 there is a value with the lowest CO mass fraction in swirl number 0.57 and can be said the most perfect at the equivalence ratio 1.6 is the swirl number 0.57. Keywords: Partially Premixed Combustion, swirl number, equivalence ratio, and NOx pollutant
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSF 620.106 4 Aji a-1 3100018076123 |
| Uncontrolled Keywords: | Partially Premixed Combustion , Temperature, Emisi NOx, Swirl Number |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ266 Turbines. Turbomachines (General) T Technology > TJ Mechanical engineering and machinery > TJ785 Internal combustion engines. Spark ignition |
| Divisions: | Faculty of Industrial Technology > Physics Engineering > 30201-(S1) Undergraduate Thesis |
| Depositing User: | ARYO PRASTYO AJI |
| Date Deposited: | 17 Nov 2020 04:48 |
| Last Modified: | 30 Nov 2020 07:17 |
| URI: | http://repository.its.ac.id/id/eprint/55029 |
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