• Gopinath S
• Yuvaraj C
• JV Muruga Lal Jeyan

Scramjet Isolator's main function is to decelerate the high-speed flow within the scramjet engine and stabilize the flow before it enters the combustor to a suitable condition. The difference in pressure due to combustion will spread forward and may impact the isolator flow area. This resulted in the inlet region creating "Un-start" status. To prevent this state of un-starting, the insulator will be built to keep the shock train inside the isolator. Indeed, insulator leads to extra weight and viscous drag which greatly affects scramjet engine performance. For the impact of divergent angle or Bleed air, and so on, shorter insulator should be used to reduce the extra weight. This thesis deals with the theoretical analysis of scramjet isolator efficiency by injecting bleed air into the inside of the isolator flow. Testing was conducted at the inlet Mach number M=1.3 and by injecting the bleed air for different Mach numbers (0.3, 0.35, 0.4). Comparisons were made with various cases and with the base model as well. The models were developed using CATIA V5, and the research was carried out using the software program ANSYS Workbench. The bleed air insulator is best able to obstruct the inlet Un-start condition due to the shock train.

Isolator, Shock train, Bleed Air, un-start

"Computational analysis of Scramjet Isolator with effects of Bleed air", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 1, page no.1947-1951, January 2019, Available :http://www.jetir.org/papers/JETIRDY06309.pdf

"Computational analysis of Scramjet Isolator with effects of Bleed air", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 1, page no. pp1947-1951, January 2019, Available at : http://www.jetir.org/papers/JETIRDY06309.pdf