Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Heaters and measuring instruments decided for purchase and use in experimentation.
Thermocouples for heating instruments
Electric Heaters for heater.
Simulation ready to be verified by experimentation.
Decided to buy premade honeycomb core sandwiches as opposed to making it ourselves to save time since making it ourselves requires overnight high temperature curing.
New assumptions:
No adhesives are used (heat transfer is just due to the aluminum core and aluminum skins). Adhesives are still present to keep the aluminum core and skin together, however, we will not have to test for suitable adhesives as we assume the final product will not use adhesives.
Accomplishments from Previous Week
Decided on thermocouples and electric heaters.
Found buyers for thermocouples, electric heaters, and aluminum core sandwiches
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Have materials ordered for fabrication.
Order thermocouple wire from OMEGA (<$50 expense) after getting sponsor approval on Thursday - Alex
Have an experiment procedure designed (Also includes on deciding a factor of safety in terms of pneumatic air temperature)
Continue to modify the simulation to represent the complexity in heat transfer due to perforated skin and the aluminum honeycomb core.
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
If possible, assume that the air in the honeycomb core and the perforated skin in conductivity via air. Assume that the air is the same temperature as the surrounding skin (March 31, 2017 via email with Jerry)
Modified simulation to include parallel thermal resistance between the aluminum and conduction in air within the honeycomb core and the perforated skin
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
None (see last week for most recent comments)
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
None (see last week for most recent comments)
Risks and Areas of Concern
Shipping time of suppliers.
Due to the many constraints of this project, we are left to looking into mainly different materials if changing thicknesses, cell sizes, and perforations do not yield sufficient results. Most manufactures of honeycomb cores produce either composites or aluminum. Our sponsors want a full metal design, so looking into different materials may also be limited.
Many manufacturers only sell set cell sizes and thicknesses for aluminum honeycomb cores (especially premade aluminum sandwiches). Though purchasing different kinds of aluminum skins are easier, variables such as thecell size or thickness of the honeycomb cores may prove difficult due to the different products of manufacturers. Thus, we need to find multiple manufacturers in order to supply different cell sizes and thicknesses. However, different manufacturers use different aluminum which may also cause a problem. As a result, we need to design an experiment that can model the effect of cell size and thickness on heat transfer in order to account for the lack in varying cell sizes and thicknesses of honeycomb cores that manufacturers provide.
Resources or Information Required but not Available
Autoclave for high-temperature epoxy curing may be necessary for different heights or cell sizes in honeycomb structure
Convective Heat Transfer Coefficient of hot side.
Schedule
Have materials ordered for fabrication.
Have an experiment procedure designed.
Continue to modify the simulation to represent the complexity in heat transfer due to perforated skin and the aluminum honeycomb core.
Continue to look into different manufacturers via calls and emails and make a list of costs and type of aluminum honeycomb core sandwiches.
Budget (list amount spent and amount remaining)
None Spent
Remaining:
Progress on Report and Webpage
Report exists. Webpage exists.