Salami Rocket: Unterschied zwischen den Versionen
Amir (Diskussion | Beiträge) |
Amir (Diskussion | Beiträge) (→Parts) |
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| + | All parts directly participating in the combustion would have to sustain at least 51 bar (vapor pressure of N<sub>2</sub>0 at 20°C) but for reasons of safety i assume 200bar as the minimum. | ||
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* [http://en.wikipedia.org/wiki/Pressure_vessel Run Tank]: A light-weight container for the oxydizer capable of sustaining enough pressure | * [http://en.wikipedia.org/wiki/Pressure_vessel Run Tank]: A light-weight container for the oxydizer capable of sustaining enough pressure | ||
* Throttle Valve: A valve to allow precise regulation of the oxydizer flow from the run tank to the [http://en.wikipedia.org/wiki/Combustion_chamber combustion chamber]. | * Throttle Valve: A valve to allow precise regulation of the oxydizer flow from the run tank to the [http://en.wikipedia.org/wiki/Combustion_chamber combustion chamber]. | ||
Version vom 28. Juli 2009, 14:49 Uhr
WTF?
Nomen est omen. Salami rocket is about building a hybrid rocket with a gaseous oxydizer (N20) and salami as propellants.
Oxydizer
I chose N2O over O2 because although N2O carries a lot of conjectural inert nitrogen (64%) oxygen is much harder to handle (tank filling, storage & injection). Additionally the nitrogen, though not participating in combustion, raises the fuel erosion rate and cooles the nozzle enough to reuse it many times. Since the alternatives i found are quite expensive, i use the nitrous oxyde of whipped-cream chargers. By the way, never search for "Sahnespender" at google.
Fuel
Salami: High efficency hydrocarbon based fuel ;)
Simulation
Im using RockSim to simulate the flight stability of the rocket. The behaviour of the N20/ hybrid motor is simulated by an external model programmed in C++.
Parts
All parts directly participating in the combustion would have to sustain at least 51 bar (vapor pressure of N20 at 20°C) but for reasons of safety i assume 200bar as the minimum.
- Run Tank: A light-weight container for the oxydizer capable of sustaining enough pressure
- Throttle Valve: A valve to allow precise regulation of the oxydizer flow from the run tank to the combustion chamber.
- Injector: Aids in vaporizing the (still) liquid oxydizery.
- Combustion Chamber: Where the oxydizer/fuel mix burns. Additionally to pressure (same amount as for the run tank) it has to sustain heat.
- Nozzle: An opening that dramatically accelerates the hot gas escaping the combustion chamber.
- Ignitor: Preheating the fuel and initializing combustion.
- Body tube: Enhances airodynamic properties of the rocket and encapsulates the motor.
- Recovery System (parachute): Enables slow decent after burn-out for safety and reusability
- Tail camera: It's all about the nice view
- Altimeter: Measurement concludes the fate of the cat
- Electric beacon: Transmits a signal to ease finding the landing site.
- Filling system: Pipework to fill the run tank with nitrous oxyde from whipped cream chargers.
Run Tank
Smart Parts C02 aluminium tank for paintball guns with on/off valve.
- Capacity: 591ml (20 oz)
- Connector: 1,27cm (1/2")
- Max Pressure: 200bar
- Price: 45€
On/Off Valve
No separate valve needed since the proposed CO2 tank has it built-in.
Throttle valve
An adjustable throttle valve (Stasto VRB-030) intended for use in hydraulics.
- Connector: 1,27cm (1/2")
- Flow rate: 45 l/min
- Working pressure: 350 bar
- Price: 30€
Injector
Probably custom made or this one -> SKR-54UC
- Diameter: 54mm
- Price: 53 €
Combustion Chamber
C02 aluminium tank for paintball guns without on/off valve.
- Capacity: 591ml (20 oz)
- Connector: 1,27cm (1/2")
- Max Pressure: 200bar
- Price: 14€
Nozzle
SKR-54NZL graphite nozzle
- Diameter: 54mm
- Price: €35
Ignitor
None selected yet.
Shell
A nice design proposal by mactux. Exact specifications & blue prints yet to be made.
Recover System
None specified/selected yet.
