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Chris Strauss3-20-08

AerothermodynamicsSemester Recap

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Sizing Codes Initial Sizing Code

– Used Excel and dimensions from Vanguard and Purdue Hybrid Rocket to linearly scale project rocket based on payload mass

– Problem arose when small payload masses yielded unreasonably small launch vehicles (ex. 200g payload total vehicle length of 0.5112 m)

– Decided to make new sizing code based on fuel volume

Sizing Based on Fuel Volume– Used Excel and fuel density and total fuel burned for to

calculate total fuel volume for multiple fuels– Sized vehicle using arbitrary diameter to calculate height of

each stage– Work discontinued in favor of MAT code for sizing

Aerothermodynamics

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CFD Fluent

– Worked with Brian Budzinski and Jayme Zott to make a Fluent model of Vanguard to test modeling method

– Created half of Vanguard in Catia and loaded that shape into GAMBIT for grid construction

– Helped with initial grid construction until Fluent team reduced to single person

CMARC– Worked with Liaquat Iqbal to create a CMARC model of

the rocket to run faster CFD cases– CMARC discontinued after it was discovered that the

results are only valid up to Mach 0.9

Aerothermodynamics

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Backup Slides-Other Work Monte-Carlo Standard Deviations

– Created method for calculating the Standard deviation of CD

– Method used a randomizer to generate values of angle of attack

– Angles of attack then fed into CD code (created by Jayme Zott) to obtain CD values

– Values then entered into Excel where standard deviation was calculated using standard deviation function (Excel calculations by Brian Budzinski)

– Results: Standard Deviation for CD is 13.29%

Aerothermodynamics

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Backup Slides- Sizing Code Tables Initial Sizing Code Table of Results

450R

Payload Mass 1 (kg): 0.2Payload Mass 2 (kg): 1Payload Mass 3 (kg): 5

PM 1 PM 2 PM 3Overall Length (m, scale 1): 0.48298 2.4149 12.0745Overall Length (m, scale 2) 0.5112 2.556 12.78

First Stage Length (m): 0.25268 1.2634 6.317First Stage Diameter (m, scale 1): 0.02836 0.1418 0.709First Stage Diameter (m, scale 2): 0.6953 0.7357 0.9377

Second Stage Length (m): 0.11404 0.5702 2.851Second Stage diameter (m, scale 1): 0.02034 0.1017 0.5085Second Stage Diameter (m, scale 2): 0.38582 0.4271 0.6335

Third Stage Length (m): 0.05532 0.2766 1.383Third Stage Diameter (m, scale 1): 0.01158 0.0579 0.2895Third Stage Diameter (m, scale 2): 0.11524 0.1502 0.325

Table Created by Chris Strauss

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Backup Slides-CFD Models to be used for GAMBIT griding of project rocket

•Initial models of project rocket

•Model would have been used to simulate each stage of flight in Fluent

Models Created by Chris Strauss

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Backup Slides-CFD CMARC Model

•Model of aircraft launched rocket initially conceived

•Model was flexible enough so that multiple configurations could be made quickly

•Model was scrapped after it was discovered CMARC results are only valid to Mach 0.9

Model Created by Chris Strauss

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References Wade, M., “Vanguard”, 1997-2007.

[http://www.astronautix.com/lvs/vanguard.htm]

Tsohas, J., “AAE 450 Spacecraft Design Spring 2008: Guest Lecture Space Launch Vehicle Design”, 2008

“The Vanguard Report”, The Martin Company, Engineering Report No. 11022, April 1960