MAE+112SecondExam2008

# MAE+112SecondExam2008 - MAE 112 SECOND EXAM Do all three...

• Notes
• 1
• 100% (9) 9 out of 9 people found this document helpful

This preview shows page 1. Sign up to view the full content.

MAE 112 SECOND EXAM March 11, 2008 Do all three problems in eighty minutes. Open books and notes. Calculator allowed. I. Consider a turboprop engine that flies at a Mach number of 0.45 with ambient conditions at 298 K and one atmosphere of pressure. The air capture area is 0.25 square meter. The propeller is aft (downstream) of the engine. There are two turbine stages with different rotational speeds; the first one drives the compressor while the other drives the propeller. The turbine exit pressure is practically one atmosphere. Consider a combustor exit temperature of 1450 K and a mass mixture ratio μ = 30. Neglect air bleeding for cooling. The specific heat of combustion products equals 0.30 cal/gm o K. a) What is the pressure entering the compressor? Assume a polytropic diffuser efficiency equal to 0. 97. b) Assume a pressure ratio of 15 across the compressor. If the polytropic compressor efficiency is 0.96, what is the power requirement of the compressor?
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern