RW
R.F.A. Wassenaar
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Due to numerous disadvantages exhibited by hybrid rocket motors (HRMs) as a propulsive technology, adoption has not been wide-spread outside of amateurs and student rocketry teams. However, in recent years, additive manufacturing has revitalised this propulsive technology. This thesis aims to use this technology to overcome some of the disadvantages exhibited with HRMs.
By choosing regressive burn profile port geometries, shifting of the mixture ratio can be minimised, meaning parameters such as specific impulse to be more constant and – in the future – be engineered to operate at its peak efficiency. A multi-port geometry was also chosen to overcome HRMs' slower regression rate.
A practical investigation was carried out to determine the extent these changes affect the performance of HRMs compared to simulations, especially in the domain of the mixture ratio. The results show this technology to have potential, however certain testing limitations need to be overcome before a definitive conclusion can be drawn. ...
By choosing regressive burn profile port geometries, shifting of the mixture ratio can be minimised, meaning parameters such as specific impulse to be more constant and – in the future – be engineered to operate at its peak efficiency. A multi-port geometry was also chosen to overcome HRMs' slower regression rate.
A practical investigation was carried out to determine the extent these changes affect the performance of HRMs compared to simulations, especially in the domain of the mixture ratio. The results show this technology to have potential, however certain testing limitations need to be overcome before a definitive conclusion can be drawn. ...
Due to numerous disadvantages exhibited by hybrid rocket motors (HRMs) as a propulsive technology, adoption has not been wide-spread outside of amateurs and student rocketry teams. However, in recent years, additive manufacturing has revitalised this propulsive technology. This thesis aims to use this technology to overcome some of the disadvantages exhibited with HRMs.
By choosing regressive burn profile port geometries, shifting of the mixture ratio can be minimised, meaning parameters such as specific impulse to be more constant and – in the future – be engineered to operate at its peak efficiency. A multi-port geometry was also chosen to overcome HRMs' slower regression rate.
A practical investigation was carried out to determine the extent these changes affect the performance of HRMs compared to simulations, especially in the domain of the mixture ratio. The results show this technology to have potential, however certain testing limitations need to be overcome before a definitive conclusion can be drawn.
By choosing regressive burn profile port geometries, shifting of the mixture ratio can be minimised, meaning parameters such as specific impulse to be more constant and – in the future – be engineered to operate at its peak efficiency. A multi-port geometry was also chosen to overcome HRMs' slower regression rate.
A practical investigation was carried out to determine the extent these changes affect the performance of HRMs compared to simulations, especially in the domain of the mixture ratio. The results show this technology to have potential, however certain testing limitations need to be overcome before a definitive conclusion can be drawn.
Bachelor thesis
(2020)
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Y. Jannette Walen, T. Janz, L. Peschke, M. Rehbein, N. Voß, D.C. Saadeldin, C.P. Tranquille, M.M.M. D'Heer, L.C.J. Haagh, R.F.A. Wassenaar, M.C. Naeije, F.K. Leverone, J. Sinke, Henk Cruijssen
Assembly, Integration and Verification (AIV) in space makes launching geosynchronous satellites faster and significantly cheaper in the long term. A space-tug is launched into space to perform AIV there. It assembles a standardised satellite consisting of several modules. The modules are designed in such a way that the required subsystems for a communication satellite are incorporated in the modules. Examples of these modules are a propulsion module, a solar array module and a computer module. Due to the standardised modules, testing time and costs can be reduced significantly. This ensures a delivery time of maximum one year, which is the time from order until operations in space. The modules are efficiently packed and connected to external beams in the launch vehicle, to make sure that two satellites can be launched simultaneously. The external beams take up the extreme loads that occur during launch. This decreases the dry mass of the satellite, as the modules do not need as much structural mass. The subsystem design and structural analysis result in a drymass of 1847 kg per satellite. Next to the two satellites, a refuelling tank is added in the launch vehicle to refuel the tug. The tug requires 2921 kg of fuel to transfer the two satellites and go back to its initial state. Due to the modularity of the satellites, the lifetime of the satellites can be increased. Regarding the economic feasibility of the mission, a full return on investment is expected after 15 years of operations in base case scenario.
...
Assembly, Integration and Verification (AIV) in space makes launching geosynchronous satellites faster and significantly cheaper in the long term. A space-tug is launched into space to perform AIV there. It assembles a standardised satellite consisting of several modules. The modules are designed in such a way that the required subsystems for a communication satellite are incorporated in the modules. Examples of these modules are a propulsion module, a solar array module and a computer module. Due to the standardised modules, testing time and costs can be reduced significantly. This ensures a delivery time of maximum one year, which is the time from order until operations in space. The modules are efficiently packed and connected to external beams in the launch vehicle, to make sure that two satellites can be launched simultaneously. The external beams take up the extreme loads that occur during launch. This decreases the dry mass of the satellite, as the modules do not need as much structural mass. The subsystem design and structural analysis result in a drymass of 1847 kg per satellite. Next to the two satellites, a refuelling tank is added in the launch vehicle to refuel the tug. The tug requires 2921 kg of fuel to transfer the two satellites and go back to its initial state. Due to the modularity of the satellites, the lifetime of the satellites can be increased. Regarding the economic feasibility of the mission, a full return on investment is expected after 15 years of operations in base case scenario.