Mahmoud Ashraf Abdelmohsen Elsayed  <br/><br/>
Numerical investigation of the deflagration of turbulent premixed flames forairpremixed lpg and hydrogen in a semi-confinedobstructed compartment /  
 التحقيق العددى لأشتعال كلا من لهب غاز البترول المسال وغاز الهيدروجين المضطرب سابق الخلط مع الهواء داخل غرفة مقيدة شبه محدودة 
Mahmoud Ashraf Abdelmohsen Elsayed ; Supervised Mohamed Ahmed Yehia , Hatem Omar Haridy 
 - Cairo :   Mahmoud Ashraf Abdelmohsen Elsayed  ,   2020 
 - 151 P. :   charts , maps ;   30cm  
<br/><br/>Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Mechanical Power Engineering 
<br/><br/> This study presents a numerical study of the transient events following the ignition of  a flammable mixture of air premixed with hydrogen or LPG at different equivalence ratios inside a small semi-confined compartment obstructed with various obstacles to induce different levels of turbulence. The compartment and the data used for validation are obtained from previous experimental work that was carried out in Sydney University, Australia.The configuration of the rig is a square cross-section of 50 x 50 with length of 250 mm made of Perspex to allow laser diagnosis to detect the position of the flame front at different time steps. The numerical facility used is an in-house code named "PUFFIN" developed by a collaborative group in Loughborough University. This numerical tool applies large eddy simulation techniques with the turbulence treated using a dynamic Smagornisky model and the combustion is treated by a modified dynamic flame-let surface density model 
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<br/><br/><label>Subjects--Index Terms: </label>Dynamic Smagornisky model  Equivalence ratios  Small semi-confined compartment