EML4304C Test 2A Fall 2010

EML4304C Test 2A Fall 2010 - EML 4304C Test 2 – Fall 2010

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EML 4304C Test 2 – Fall 2010 Name_______________________ 1 I am graduating in ______________ (Spring, Summer, or Fall) of ______________ (2010, 2011). "On my honor, I have neither given nor received unauthorized aid in doing this assignment." Signature __________________________ 1. Butane gas and 250% theoretical air, both at 25 °C, enter a steady-flow combustor. The products of combustion exit at 900 K. (For the molecular weight of nitrogen, use 28.16. For the properties of nitrogen, assume pure nitrogen.) 1a) Write the chemical equation for the stoichiometric reaction between air and butane. 1b) Write the chemical equation for the reaction between 250% theoretical air and butane. 1c) What is the air-fuel ratio on a mole basis for the 250% air reaction? 1d) What is the air-fuel ratio on a mass basis for the 250% air reaction?
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EML 4304C Test 2 – Fall 2010 Name_______________________ 2 1e) What is the heat transfer from the combustor per kmol of butane burned for the 250% air reaction?
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Unformatted text preview: EML 4304C Test 2 – Fall 2010 Name_______________________ 3 2. Air enters a converging-diverging nozzle with low velocity at 2.0 MPa (absolute) and 140 °C. The exit area of the nozzle is 3.15 times the throat area. 2a) What is the design Mach number of this nozzle? 2b) What is the temperature of the air at the throat? EML 4304C Test 2 – Fall 2010 Name_______________________ 4 3. Air enters a converging-diverging nozzle with low velocity at 2.0 MPa (absolute) and 140 °C. The design Mach number of this nozzle is 2.57 . 3a) If the flow is isentropic, what is the velocity of the flow at the exit? 3b) What must the back pressure be to produce a normal shock at the exit plane of the nozzle? 3c) If there is a normal shock at the exit plane of the nozzle, what is the velocity of the flow just downstream of the shock?...
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This note was uploaded on 09/05/2011 for the course EML 4304C taught by Professor Abbitt during the Summer '09 term at University of Florida.

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EML4304C Test 2A Fall 2010 - EML 4304C Test 2 – Fall 2010

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