Conformance Checklist.xlsx
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- Solicitation number
- N001676172020
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| File | Type | Posted |
|---|---|---|
| Request For Information .docx | DOCX document | |
| Performance Work Statement .doc | DOC document |
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CHECKLIST
| Naval Surface Warfare Center Carderock Division (NSWCCD) |
| Boundary Layer Wind Tunnel Compliance Checklist |
| When responding to the Request for Information (RFI), use the attached specifications sheet to complete the checklist of key requirements listed below. |
This list is not all inclusive, nor are the descriptions intended to be exhaustive. Refer to the attached specifications for more complete information.
| Boundary Layer Wind Tunnel Performance Requirements | Specification Section | Modification Required? | Describe Modification | Additional Comment/Feedback |
| Technical Requirements | 3 | |||
| A blower configured to supply air to the downstream sections of the wind tunnel | 3.1 | |||
| The blower will utilize 480 VAC or less, 3-phase 60 Hz power not to exceed 180 Amps. | 3.1.1 | |||
| The blower will provide sufficient flow rate to achieve a freestream speed of 40 meters per second in the measurement section of the test section. | 3.1.2 | |||
| Guarding will be incorporated to safely restrict the accidental ingestion of objects with a cross-sectional area larger than four (4) inches squared. | 3.1.3 | |||
| The blower and the foundation for the blower will be designed and installed in such a way as to facilitate the rapid removal and repositioning of the blower assembly by means of standard hand tools and a pallet jack with a four (4) to seven (7) inch lifting range and a 5000 pound capacity. The blower assembly should be able to be accessed by the pallet jack on both the left and right side of the downstream direction. | 3.1.4 | |||
| Mechanical components of the blower assembly will be isolated from the foundation of the assembly by means of machine vibration dampening pads capable of withstanding any forces generated by the motor or blower. | 3.1.5 | |||
| Any wiring for any sensors or systems that cross the threshold between the blower section and the settling chamber will be made with connectors that can be disconnected with relative ease. | 3.1.6 | |||
| A sensor will be incorporated into the blower assembly to capture the angular velocity of the blower for use with the control interface. | 3.1.7 | |||
| A settling chamber upstream of the test section to provide uniform low-turbulence airflow to the test section | 3.2 | |||
| The settling chamber will be attached to the blower assembly by means of a semi-flexible rubberized connection that reduces ridged paths for vibration propagation. | 3.2.1 | |||
| 3.2.2. The settling chamber will include at least one removable honeycomb screen for breaking up large-scale turbulence from the blower. The honeycomb screen shall have hexagonal elements that have a stream wise length that is seven to ten times longer than the width of the hexagonal element. The honeycomb hexagonal element widths shall be less than ten (10) millimeters. | 3.2.2 | |||
| The settling chamber will include up to six (6) removable fine-mesh screens downstream of the honey comb screen to break up remaining small-scale turbulent flow. The diameter of the wires in the fine-mesh screens shall be less than 0.3 millimeters. The standard mesh size and order (from upstream to downstream) for the screens will be: 24, 24, 24, 32, 46, and 56. Each screen will be housed in frames to allow the ease of access to the screens for maintenance procedures. The spacing between each screen will be no less than 8 centimeters. The most downstream fine-mesh screen shall be 0.2 diameters of the settling chamber upstream of the nozzle that accelerates flow into the test section. | 3.2.3 | |||
| The settling chamber will provide a spatially averaged free stream turbulence intensity, (the fluctuating root-mean-square axial velocity component normalized by the time-mean, free stream axial velocity), less than 0.5% to the test section for an operational range of 3-40 meters per second. | 3.2.4 | |||
| The settling chamber will include a tapered three dimensional contraction by reducing the cross-sectional area in both width and height downstream of the last fine-mesh screen. | 3.2.5 | |||
| A test section to develop and measure boundary layer flow along the floor of the tunnel. | 3.3 | |||
| The test section will be exactly three (3) feet wide, 1.5 feet tall, and at least 12 feet long with the last three (3) feet designated as the measurement section. | 3.3.1 | |||
| The design of the test section will allow the boundary layer to mature along the floor of the tunnel. | 3.3.2 | |||
| The design of the test section will include a means by which to adjust the stream-wise pressure gradient along the entire length of the test section. | 3.3.3 | |||
| There will be static pressure taps will be installed along the entire length of the test section along one wall at six (6) inch intervals. | 3.3.4 | |||
| The test section will include removable panels located along the floor of the test section to facilitate future modifications for additional sensors. | 3.3.5 | |||
| The design will include optical windows spanning the entirety of the measurement section on both walls of the tunnel. | 3.3.6 | |||
| An exhaust section designed to redirect the exit flow from the test section. | 3.4 | |||
| The exhaust section will include a 90 degree bend with turning vanes to redirect the flow upward. | 3.4.1 | |||
| The exhaust section will have an outlet diffuser maintaining a cone angle of less than 4 degrees to achieve pressure recovery and reduce power demand from the blower. | 3.4.2 | |||
| The exhaust section will include a thermocouple and a humidity sensor just downstream of the measurement section noted in Section 3.3.1. | 3.4.3 | |||
| An interface to control, display, and record the operation of the wind tunnel system. | 3.5 | |||
| The interface will be able to control the blower by means of a standalone, closed-loop feedback system that accepts inputs from the user, an included pitot static probe, a thermocouple, and a humidity sensor. The interface can also utilize an open-loop control mode which can set the blower angular velocity thru the interface as well as by an analog signal input (0 to 10 volts) or digital signal input (0 to 5 volts sampling at 10 kHz). | 3.5.1 | |||
| The display will show the currently commanded air speed, the actual air speed determined by the pitot static probe, and the angular velocity of the motor. | 3.5.2 | |||
| 3.5.3. The interface will allow the user to start and stop the tunnel and input the desired operating air speed and blower angular velocity depending on which mode of operation is desired (see Section 3.5.1). | 3.5.3 | |||
| The readings from the pitot static probe, thermocouple, humidity sensor, and the static pressure taps will be accessible through the interface. | 3.5.4 | |||
| The calibration settings for the thermocouple and humidity sensor as well as a means to zero out the pressure readings from the pitot static probe, static ring, and static pressure taps will be accessible through the system. All calibration settings will be editable from the interface. | 3.5.5 | |||
| The interface will include a log that will record the operating date and time, commanded speed, actual speed, blower angular velocity, temperature, humidity, and the pressure values of the pitot static probe and static pressure taps. A separate log will be included that records the total run time for each operating day as well as any maintenance notes that are entered for that day. The user will be able to display the total run time for the life of the wind tunnel as well as the run time and any maintenance notes between two selectable dates. | 3.5.6 | |||
| Analog outputs will be included for the blower angular velocity, temperature, humidity, pitot static probe, and actual air speed on scale of 0 to 10 volts. | 3.5.7 | |||
| The units displayed by the interface, recorded by the logging feature, and used for the output and input signals will follow the international system of units. | 3.5.8 | |||
| The software and hardware will be open-source and will be comprised of commercial off the shelf items readily available and will be accessible remotely via an Ethernet connection. | 3.5.9 | |||
| Safety interlocks will be included in the design of the tunnel. | 3.6 | |||
| There will be a mechanical emergency stop switch to de-energize the motor within reach of the control interface regardless of the state of the control interface. | 3.6.1 | |||
| 3.6.2. There will be a three (3) pole keyed switch that has three settings: 1) prevent the un-authorized energizing of the blower motor and lock out the control interface (without key), 2) allow the authorized user to navigate the control interface and view the settings and logs for the system while keeping the motor de-energized (with key), and 3) allow the authorized user the ability to energize the motor and operate the tunnel (with key). | 3.6.2 | |||
| The wind tunnel will not exceed 33 feet in length, six (6) feet in width, and seven (7) feet in height at any point. | 3.7 | |||
| Deliverables | 5 | |||
| Documentation | 5.1 | |||
| The contractor shall provide two sets of hard copies and one set of digital manuals detailing procedures for installation and removal, maintenance, operation, and accident prevention. | 5.1.1 | |||
| The contractor shall provide two sets of hard copies and one set of digital standards detailing the fabrication drawings used to machine and assemble the system. | 5.1.2 | |||
| The contractor shall provide the Safety Data Sheets associated with any hazardous materials incorporated into the design of the system and used to maintain the system. | 5.1.3 | |||
| The contractor shall provide Digital CADD files used to design the tunnel along with calculations used to assess the performance of the tunnel prior to fabrication and after any alterations. | 5.1.4 | |||
| Where applicable, the contractor shall provide all manuals and calibration records related to commercial off the shelf items incorporated into the tunnel design. | 5.1.5 | |||
| The contractor shall provide a report of operational test results as outlined in Section 6.3 no later than 30 days after completing the test. | 5.1.6 | |||
| The contractor shall provide copies of software and code used to operate the wind tunnel utilizing the control method outlined in Section 3.5. | 5.1.7 | |||
| Warranties | 5.2 | |||
| The blower and motor shall be warranted as free of defects in workmanship and materials for a period of 36 months from the date of manufacture. | 5.2.1 | |||
| Sensors, sensor drivers, and control electronics shall be NIST certified where applicable and warranted as free of defects in workmanship and materials for a period of 24 months from the date of manufacture. | 5.2.2 | |||
| 5.2.3. Software maintenance and support will be included by the contractor for five (5) years following the commissioning of the tunnel. | 5.2.3 | |||
| The Government will perform acceptance testing not to exceed requirements stated in this PWS which will take up to 60 days to complete. If the system fails acceptance testing the contractor shall be provided the results of the acceptance testing and is required to repair the issues at the contractor’s expense. | 5.2.4 | |||
| Installation and Commissioning | 6.0 | |||
| The contractor shall be responsible for delivery, installation, and commissioning of the wind tunnel system. The contractor shall provide notice to the Government technical point of contact and to the project manager at least 60 days prior to delivery. The contractor shall provide equipment and personnel to unload and position the systems for installation. The Government will be responsible for all utility hookups required to install and operate the system. | 6.1 | |||
| Following installation, the contractor shall inspect the system for overall alignment, fit-up, structural integrity, and the proper operation of adjustable settings and safety systems. The Government will witness these checks and will require the contractor to correct any deficiencies before the system can be operated. | 6.2 | |||
| 6.3 The contractor shall perform operational testing with Government overview to demonstrate that the system meets all the requirements outlined in Section 3.0. The operational testing will be performed at 20 speeds chosen by the technical point of contact between 3 and 40 meters per second in a configuration void of any test articles and must be able to demonstrate steady readings within 1% of the testing speed. Additional runs will be conducted at five (5) speeds chosen by the technical point of contact and will be used to verify that the area-averaged freestream axial velocity turbulence intensity at the inlet of the test section is less than one half percent. An additional five (5) runs will be used to verify the stream-wise pressure gradient and the control surfaces that alter that gradient. | 6.3 | |||
| Training | 7 | |||
| The contractor shall provide training on how to operate and maintain the system safely. This training shall not exceed one (1) full day and will be provided to a maximum of four (4) Government participants at NSWCCD. | 7.1 | |||
| Spare Parts | 8.0 | |||
| The contractor shall provide spare parts to included one (1) 56 fine-mesh screen assembly, one (1) 24 mesh screen assembly, two (2) empty screen assemblies, one (1) honeycomb assembly, two (2) test section floor panels, two (2) test section window panels, and one (1) operating interface complete with software. These parts will be built to facilitate easy repair to the wind tunnel and housed in a dedicated protective container provided and configured by the contractor. | 8.1 | |||
| Security Requirements | 9.0 | |||
| All work products will be designated UNCLASSIFIED. The contractor shall seek permission from the Government before sharing design and fabrication information with any sub-contractors or any third party. | 9.1 |
| Key | |
| Column D | Yes |
| No |
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