9th Intercollegiate Rocket Engineering Competition

Critical Design ReviewSPACE CONCORDIA ROCKETRY DIVIS ION

FEB 13 TH, 2014

Competition Overview•Intercollegiate Rocket Engineering Competition (IREC)

◦ June 26th-28th, 2014

◦ Green River, Utah

◦ International schools

•Last year’s winners• Basic: Polytéchnique (2nd win)

• Advanced: New Mexico Institute of Mining and Technology

Hybrid Motor RocketCustomized HTPB-N2O Hybrid Motor capable of reaching 10,000 ft.

Chamber Pressure 400 psi (Iterated 300 to 450 psi)

Altitude 10,000 ft.

Specific Impulse (Isp) 200 (Iterated till 260)

Burn time, Tb 10 sec

Average Thrust 1000 N

Booster ratio 3.32

Initial Fixed values

Ballistics Values_____________________________________________________________________________________________________________________________________________________________________________________________________________________________

Mass flow rate 0.4846 Kg/s

Mass of Propellant 3.243 Kg (HTPB)

Chamber temperature, Tc 2031 K

Characteristics Exhaust velocity, C* 1361 m/s

Exhaust Velocity, C 1963 m/s

Pressure at exit 15.267 psi

Burning rate 3.1 mm/s

O/F ratio 2.1

Grain DesignGrain length 524.21 mm

Inner diameter 34.6 mm

Outer diameter 94 mm

Burn Area 0.057 m2

Port Area 0.00094 m2

Web thickness 30.99 mm

Density (HTPB) 930 Kg/m3

Motor Dimensions______________________________________________________________________________________________________________________________________________________________________________________________________________________________

Motor Dimensions 630 mm X 98 mm

Thrust Chamber 585.77 mm X 1.27 mmX 98 mm

Casing thickness 1.27 mm (0.05 in AL 6060-T6)

Thrust Chamber Material AL 6061-T6

Designed Pressure 800 psi

Liquid N2O Injector__________________________________________________________________________________________________________________________________________________________________________________________________

Material 17-4 Stainless Steel

Dimensions 26 mm OD X 4 mm thick)

Orifices type Short tube ( 5 holes X 2 mm dia.)

Discharge Coefficient 0.86

Bulkhead

Dimensions 94 mm dia. X 0.635 mm thick (AL alloy)

Nozzle parameters__________________________________________________________________________________________________________________________________________________________________________________________________

Inlet Diameter 32.2 mm

Throat Diameter 21.9 ~ 22 mm

Exit Diameter 43.92 mm ~ 44 mm

Converging Half Angle 22`

Diverging Half Angle 12`

Expansion Ratio 4.095

Nozzle Analysis__________________________________________________________________________________________________________________________________________________________________________________________________

Flow Simulation