Loading...

Experimental Investigation on the Effect of Air Swirlers on Kerosene Spray Combustion under Highly Diluted and Preheated Conditions

Arazi Kalat, Sadegh | 2021

216 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55001 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Mardani, Amir
  7. Abstract:
  8. In this study, the effects of using the co-flow air rotation on Kerosene combustion under air preheating and diluting conditions have been investigated. During this research, we have tried to achieve combustion under the MILD regime by simultaneous diluting, preheating, and swirling the co-flow air, which has also been achieved. To investigate the factors affecting the flame structure such as preheating temperature, dilution, swirl number, airflow rate, and also the type of fuel nozzle, the Sharif University MILD combustion test rig (SMCTR) has been upgraded in this research.The SMCTR has a symmetrically axial structure and provides a co-flow air with the desired temperature, swirl number, and dilution level for a liquid fuel spray combustion and a variety of fuel spray nozzle types and injection pressure. By performing flame photography, the geometrical characteristics of the flame such as length, flame front view area, the equivalent volume of the flame, and lift off are studied. Also, by imaging with bandpass filters, the chemiluminescence characteristics of the flame for species such as HCO, N2O, and CH have been investigated. By reviewing the obtained results, the flame structures observed during the tests were classified into five flame structures for non-diluted conditions and two structures for diluted conditions. One of the two structures presented in flames with dilution is the blue flame structure. This blue flame structure, which is created at high dilution conditions and high preheating temperature using a high-swirl airflow, has many similarities to the MILD combustion regime specifications, therefore it seems that we have achieved the MILD combustion regime. Another issue investigated in this study is the flame stability under the conditions of co-flow air swirling along with preheating and dilution. A stability map has been extracted for these conditions and a wider operational condition with a stable flame in case of using co-flow air swirling has been reported
  9. Keywords:
  10. Preheating ; Dilution ; Spray Combustion ; Crocin ; Moderate or Intense Low Axygen Dilution (MILD) ; Diluting Conditions ; Flame Stabilization

 Digital Object List

 Bookmark

No TOC