A hybrid rocket engine is a device that is used to propel an object, generally a rocket, to a user specified point in the atmosphere. The engine can achieve this by converting the chemical energy of the propellants into thermal energy, and ultimately converting that into mechanical energy that imparts a change in momentum on the rocket. The hybrid engine differs from other engines because of the fact it uses a liquid oxidizer, with a separate solid fuel. Separating the fuels makes it inherently safer to store and operate than a traditional liquid or solid motor. The purpose of this project is to build a custom hybrid engine test stand for RIT Launch Initiative to launch a rocket to 30,000 feet at the 2019 Intercollegiate Rocketry and Engineering Competition (IREC). The test stand must be built to withstand the pressure and thrust of the rocket, as well as the cold and hot fire tests that the rocket must go through in order to be launch ready. It must be safe to handle, reusable, high performing, environmentally friendly, and comply with all IREC and government regulations. By year's end, the engine must be ready for tests like the static hot hire test, cold flow test, proof pressure test and system leak test in the bunker on RIT’s campus.
Team Vision for Detailed Design Phase
During this phase, the team further developed the subsystems that had been discussed previously and managed to provide adequate design details for building and assembly.
In particular, the team focused on:
- Final Structures Analysis
- Detailed Mechanical Integration and Assembly
- Integration and Implementation of the DAQ system
- Wiring Diagrams for the Sensors to DAQ System Assembly
- A high level bill of materials
- Confirmed funding levels
- A plan of action for next semester
Detailed Design Power Point
Mechanical System Updates
- The full CAD model is near completion
- The clamp assembly is complete. The ID has been adjusted after remeasuring the OD plus rounds have been added to account for the combustion chamber integration. The silicone rubber has been added as well to ensure clamping force is achieved.
- The carriage-rail assembly is complete. The base plate from the I-beams has been added to this assembly for ease of bolt application. The carriage plate has been made narrower so that it can be machined in the CNC machine so that the rails can be as parallel as possible.
- The tank support assembly will be the same used a last year. This is implemented into the final design, however the location and orientation needs to be finalized. Also the location of the mass flow rate sensor to ensure compression and good reading needs to be completed still.
- Thickness of the Load Adapter was increased in order increase the factor of safety obtained through ANSYS.
- Static Structural Finite Element Analysis of individual components on the test stand due to thrust vectoring is complete.
Electrical and DAQ Systems Updates
- The NI-cDAQ system will be in the bunker, and encased in a bud box. This will prevent any damage to the device, and is cheap to implement.
- USB to Ethernet converters will be used to extend the data line at least 200 feet from the bunker. Either that or a 50ft adapter will be used, and the laptop for acquisition will be right outside of the bunker.
- A mini computer might need to be purchased, and this would be a max of $200. This would require the purchasing of an external hard drive, as well as a monitor, key board, mouse, and HDMI cable with USB splitters.
- My DAQ system will have a continuous for loop running at a low signal, and will only initiate once a high signal is received from John’s mission control. This will be the “Hand Shake” between our two systems.
- Wires, and BX Cable Cost has been accounted for in the BOM. BX cable will be used to encase the smaller wires from each sensor.
- DAQ hardware has 8GB of RAM internally that can be programmed to store all of the data, much faster than a computer. This can and will provide adequate storage of data.
- Data will be instantly exported to an Excel file on the computer, and will be done so through LabView.
- Sampling rate will be at 1000 Hz. This is set by me in the LabView software. This would be a software timed generation, which is the best way to ensure that the sensors are receiving a signal and working properly.
- Details explaining this can be seen in the DAQ System subsections below
Mechanical Systems Layout for Assembly
Mechanical Systems ANSYS Simulation
Electrical and Data Acquisition System Simulations and Layout for Assembly
DAQ System Hardware and Sensors
Bill of Material (BOM)
Plans for next phase
Individual Completed Goals and New Goals
|Team Member Name||Detailed Design 3 Week Goals||Next Semester Goals|