Test 3 Matlab

# Test 3 Matlab - AOE 4234 Test 3 Sossi Craig 904512344 Code...

This preview shows pages 1–3. Sign up to view the full content.

AOE 4234 November 20, 2009 Test 3 Sossi, Craig 904512344 Code Output: **Calculated Values for Various Mach Numbers** -------------------------------------------------------------------------- Parameter M = 1.6 M = 1.75 M = 2.0 M = 2.25 M = 2.5 -------------------------------------------------------------------------- P02/P0a 0.9239 0.9565 0.9567 0.9069 0.8257 ndiff 0.9340 0.9668 0.9717 0.9452 0.9041 T/Ma 1.4323 1.4015 1.3378 1.2593 1.1631 TSFC 0.0149 0.0143 0.0132 0.0119 0.0102 Mc 0.2448 0.3074 0.4276 0.5665 0.7209 T 0.3506 0.4308 0.5721 0.7134 0.8384 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 0.8 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 1 P02/P0a vs. Mach Number Mach Number P02/P0a In the above plot, it can be seen that the pressure ratio increases to a critical mach number, then begins to decrease. From this plot it can be seen that there is an optimal free- stream Mach number that will return the highest pressure ratio across the induced shocks in the engine inlet. 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 0.8 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 1 Diffuser Efficiency vs. Mach Number Mach Number Diffuser Efficiency

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
AOE 4234 November 20, 2009 Test 3 Sossi, Craig 904512344 The above plot shows the diffuser efficiency as a function of Mach number. As with the pressure ratio plot, there is an optimum free-stream Mach number for the greatest diffuser efficiency. If the diffuser efficiency is high, the turbofan engine will thus be efficient. 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5 Specific Thrust vs. Mach Number Mach Number T/ma As the inlet Mach number increases, the specific thrust produced by the turbofan decreases. This is because as the inlet Mach number increases, the diffuser becomes less efficient, in turn making the turbofan engine less efficient. 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 0.01 0.0105 0.011 0.0115 0.012 0.0125 0.013 0.0135 0.014 0.0145 0.015 Thrust Specific Fuel Consumption vs. Mach Number Mach Number TSFC As the Mach number increases in the inlet, the turbofan engine becomes more efficient.
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