SITIS Archives - Topic Details
Program:  SBIR
Topic Num:  AF071-263 (AirForce)
Title:  Feedback Flow Control for a Three-Dimensional Turret
Research & Technical Areas:  Air Platform, Materials/Processes

  Objective:  Demonstrate feedback control and aerodynamic flow control for control of the wake behind a three-dimensional (3D) turret.
  Description:  The integration of aerodynamic flow control with feedback control has resulted in improved flow characteristics for several U.S. Air Force applications with two-dimensional (2D) geometries. One particular application of interest to the Air Force is the control of turbulent flow around a 3-D turret affixed to a solid wall at speeds ranging from compressible subsonic to high subsonic. The 3-D nature of this configuration makes the application of current feedback flow control methods extremely challenging. For adaptive optics configurations, it is expected that increasing the frequency and reducing the size of turbulent structures in the wake, and thereby reducing the maximum level of the energy spectrum of the flow, will result in reduced aero-optic degradation as an electromagnetic beam passes through the turbulent flow near the turret. The integration of feedback control improves robustness to changing flow conditions, e.g., Mach and Reynolds numbers and incoming flow direction. An essential element is a model that represents the dynamics of the input/output relationships with feedback control operating. As it is envisioned that the application will ultimately be mounted on an air vehicle, sensor and actuator locations are typically limited to the boundary of the turret and/or the solid wall in the vicinity of the turret. Off-boundary measurements considered for uses other than for the optimization of actuator and sensor locations, determination of actuator effectiveness in the laboratory or simulation, and model development must be amenable to application on an air vehicle as the goal is wake control in flight as well as in the laboratory. Laboratory demonstrations show that active flow control can be used with feedback control for a variety of potential applications. For example, feedback flow control has been used to extend the usable range of angles of attack for a 2-D airfoil, to suppress vortex shedding on a 2-D circular cylinder, and lower acoustic tones in a subsonic cavity. However, application to 3-D geometries remains a challenge because experimental results clearly demonstrate that 3-D effects play a large role in wake flows. Successful demonstration of flow control for the turret wake necessitates a dynamic model of the input/output relationships that is accurate when feedback control is operating, actuators and sensors suitable for use in flight, and a control law designed using the dynamical model that can be implemented in real-time applications.

  PHASE I: Define a concept for experimental demonstration of the integration of feedback control and aerodynamic flow control for a 3-D turret configuration, including actuators and sensors. Develop prototypes of the model and control law.
  
  PHASE II: Demonstrate experimentally an aerodynamic flow control methodology that reduces the maximum level of the energy spectrum of the flow past a 3-D turret.

  DUAL USE COMMERCIALIZATION: Military application: High payoff military applications include directed energy, laser designation and tracking, laser communication, and high-resolution imagery. Commercial application: Examples of potential commercial applications include laser communication and high resolution imagery.

  References:  1. Ausseur, J.M., Pinier, J.T., Glauser, M.N., Higuchi, H., and Carlson, H., “Controller Development for Closed-Loop Feedback Control of Flows,” AIAA Paper 2005-5264, presented at the 35th AIAA Fluid Dynamics Conference, Toronto, Ontario, Canada, June 2005. 2. Siegel, S., Cohen, K., and McLaughlin, T., “Feedback Control of a Circular Cylinder Wake in a Water Tunnel Experiment,” AIAA Paper 2004-0580, presented at the 42nd AIAA Aerospace Sciences Meeting, Reno, Nevada, January, 2004. 3. Caraballo, E., Yuan, X., Little, J., Debiasi, M., Yan, P., Serrani, A., Myatt, J.H., and Samimy M., “Feedback Control of Cavity Flow Using Experimental Based Reduced Order Model,” AIAA Paper 2005-5269, presented at the 35th AIAA Fluid Dynamics Conference, Toronto, Ontario, Canada, June 2005. 4. Gordeyev, S., Hayden, T.E., and Jumper, E.J., “Aero-Optical and Hot-Wire Measurements of the Flow Around the Hemispherical Turret With a Flat Window,” AIAA Paper 2004-2450, presented at the 35th AIAA Plasmadynamics and Lasers Conference, Portland, Ore., June-July 2004.

Keywords:  aerodynamic flow control, active flow control, feedback control, turret, optic

Additional Information, Corrections, References, etc:
I. Commercialization Achievement Index (CAI)

Subsection d of section 3.5 in the Program Solicitation for the DoD 2007.1 SBIR Solicitation (http://www.acq.osd.mil/osbp/sbir/solicitations/sbir071/index.htm)
states, "Firms with a CAI [Commercialization Achievement Index] at the 15th percentile or below may receive no more than half of the evaluation points available for commercial potential criteria (see Section 4.4)." Check the solicitation carefully for the complete discussion of the use of the CAI in proposal evaluation and ensure your commercialization data are accurate and current.

II. International Traffic in Arms Regulation (ITAR) Limitations

At the discretion of the contracting officer, a contract awarded under this topic may contain Air Force Materiel Command (AFMC) Federal Acquisition Regulation (FAR) clause 5352.227-9000, Export-Controlled Data Restrictions. The clause states:

As prescribed in [AFMC FAR] 5327.9002(a), insert the following clause, substantially as written, in Section I:
EXPORT-CONTROLLED DATA RESTRICTIONS (AFMC) (JUL 1997)
(a) For the purpose of this clause,
(1) Foreign person is any person who is not a citizen or national of the U.S. or lawfully admitted to the U.S. for permanent residence under the Immigration and Nationality Act, and includes foreign corporations, international organizations, and foreign governments;
(2) Foreign representative is anyone, regardless of nationality or citizenship, acting as an agent, representative, official, or employee of a foreign government, a foreign-owned or influenced firm, corporation or person;
(3) Foreign sources are those sources (vendors, subcontractors, and suppliers) owned and controlled by a foreign person; and

(b) The Contractor shall place a clause in subcontracts containing appropriate export control restrictions, set forth in this clause.

(c) Nothing in this clause waives any requirement imposed by any other U.S. Government agency with respect to employment of foreign nationals or export controlled data and information.

(d) Equipment and technical data generated or delivered under this contract are controlled by the International Traffic in Arms Regulation (ITAR), 22 CFR Sections 121 through 128. An export license is required before assigning any foreign source to perform work under this contract or before granting access to foreign persons to any equipment and
technical data generated or delivered during performance (see 22 CFR Section 125). The Contractor shall notify the Contracting Officer and obtain written approval of the Contracting Officer prior to assigning or granting access to any work, equipment, or technical data generated or delivered under this contract to foreign persons or their
representatives. The notification shall include the name and country of origin of the foreign person or representative, the specific work, equipment, or data to which the person will have access, and whether the foreign person is cleared to have access to technical data (DoD 5220.22-M, National Industrial Security Program Operating Manual
(NISPOM)).
(End of clause)

The text of this and other contracting clauses that may be used can be found at http://farsite.hill.af.mil

This may impact the ability of contractors and subcontractors to use employees who are not citizens or legal permanent residents of the United States of America to perform work under this contract.

III. Publication of Results

The contract will likely contain Defense Federal Acquisition Regulation (DFAR) clause 252.204-7000, Disclosure of Information. The clause states:

As prescribed in [DFAR] 204.404-70(a), use the following clause:

DISCLOSURE OF INFORMATION (DEC 1991)
(a) The Contractor shall not release to anyone outside the Contractor's organization any unclassified information, regardless of medium (e.g., film, tape, document), pertaining to any part of this contract or any program related to this contract, unless-
(1) The Contracting Officer has given prior written approval; or
(2) The information is otherwise in the public domain before the date of
release.

(b) Requests for approval shall identify the specific information to be released, the medium to be used, and the purpose for the release. The Contractor shall submit its request to the Contracting Officer at least 45 days before the proposed date for release.

(c) The Contractor agrees to include a similar requirement in each subcontract under this contract. Subcontractors shall submit requests for authorization to release through the prime contractor to the Contracting Officer.
(End of clause)

The text of this and other contracting clauses that may be used can be found at http://farsite.hill.af.mil

If included in a contract, this clause requires that the release of any data or other information, including unclassified data and information, must be approved by the U.S. Air Force before release. This includes conference papers, journal articles, and extended abstracts or other short documents submitted to conference planners. The clause applies to subcontractors. While the clause requires the contractor to submit the request 45 days prior to the proposed date for release, approval is often obtained in three weeks.

IV. Requirement to Acknowledge Financial Support by U.S. Air Force in Publications

The contract will likely contain DFAR clause 252.235-7010, Acknowledgment of Support and Disclaimer.

As prescribed in [DFAR] 235.071(c), use the following clause:

ACKNOWLEDGMENT OF SUPPORT AND DISCLAIMER (MAY 1995)
(a) The Contractor shall include an acknowledgment of the Government's support in the publication of any material based on or developed under this contract, stated in the following terms: This material is based upon work supported by the (name of contracting agency(ies)) under Contract No. (Contracting agency(ies) contract number(s)).

(b) All material, except scientific articles or papers published in scientific journals, must, in addition to any notices or disclaimers by the Contractor, also contain the following disclaimer: Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of
the (name of contracting agency(ies)).
(End of clause)

The text of this and other contracting clauses that may be used can be found at http://farsite.hill.af.mil

This clause precludes the release of data or other information without government approval by omitting reference to support by the U.S. Air Force.

V. Disclaimer

Nothing in the additional information can supersede, abrogate, or alter the solicitation. Should anything in the additional information conflict with the solicitation, the formal solicitation takes precedence.
VI. PLEASE NOTE that the Air Force SBIR 07.1 Proposal Submission Instructions state, "Phase I proposals have a 20 page-limit (excluding the cost proposal and Company Commercialization Report)." Although the DoD instructions state the limit is 25 pages, proposals for Air Force topics will need to follow the guidelines under the AF submission instructions.


VII. PLEASE NOTE that the Air Force SBIR 07.1 Proposal Submission Instructions state, "The Phase I award winners must accomplish the majority of their primary research during the first six months of the contract. Each Air Force organization may request Phase II proposals prior to the completion of the first six months of the contract based upon an evaluation of the contractor's technical progress and review by the Air Force Technical point of contact utilizing the criteria in section 4.3 of the DoD solicitation."
I. Commercialization Achievement Index (CAI)

Subsection d of section 3.5 in the Program Solicitation for the DoD 2007.1 SBIR Solicitation (http://www.acq.osd.mil/osbp/sbir/solicitations/sbir071/index.htm)
states, "Firms with a CAI [Commercialization Achievement Index] at the 15th percentile or below may receive no more than half of the evaluation points available for commercial potential criteria (see Section 4.4)." Check the solicitation carefully for the complete discussion of the use of the CAI in proposal evaluation and ensure your commercialization data are accurate and current.

II. International Traffic in Arms Regulation (ITAR) Limitations

At the discretion of the contracting officer, a contract awarded under this topic may contain Air Force Materiel Command (AFMC) Federal Acquisition Regulation (FAR) clause 5352.227-9000, Export-Controlled Data Restrictions. The clause states:

As prescribed in [AFMC FAR] 5327.9002(a), insert the following clause, substantially as written, in Section I:
EXPORT-CONTROLLED DATA RESTRICTIONS (AFMC) (JUL 1997)
(a) For the purpose of this clause,
(1) Foreign person is any person who is not a citizen or national of the U.S. or lawfully admitted to the U.S. for permanent residence under the Immigration and Nationality Act, and includes foreign corporations, international organizations, and foreign governments;
(2) Foreign representative is anyone, regardless of nationality or citizenship, acting as an agent, representative, official, or employee of a foreign government, a foreign-owned or influenced firm, corporation or person;
(3) Foreign sources are those sources (vendors, subcontractors, and suppliers) owned and controlled by a foreign person; and

(b) The Contractor shall place a clause in subcontracts containing appropriate export control restrictions, set forth in this clause.

(c) Nothing in this clause waives any requirement imposed by any other U.S. Government agency with respect to employment of foreign nationals or export controlled data and information.

(d) Equipment and technical data generated or delivered under this contract are controlled by the International Traffic in Arms Regulation (ITAR), 22 CFR Sections 121 through 128. An export license is required before assigning any foreign source to perform work under this contract or before granting access to foreign persons to any equipment and
technical data generated or delivered during performance (see 22 CFR Section 125). The Contractor shall notify the Contracting Officer and obtain written approval of the Contracting Officer prior to assigning or granting access to any work, equipment, or technical data generated or delivered under this contract to foreign persons or their
representatives. The notification shall include the name and country of origin of the foreign person or representative, the specific work, equipment, or data to which the person will have access, and whether the foreign person is cleared to have access to technical data (DoD 5220.22-M, National Industrial Security Program Operating Manual
(NISPOM)).
(End of clause)

The text of this and other contracting clauses that may be used can be found at http://farsite.hill.af.mil

This may impact the ability of contractors and subcontractors to use employees who are not citizens or legal permanent residents of the United States of America to perform work under this contract.

III. Publication of Results

The contract will likely contain Defense Federal Acquisition Regulation (DFAR) clause 252.204-7000, Disclosure of Information. The clause states:

As prescribed in [DFAR] 204.404-70(a), use the following clause:

DISCLOSURE OF INFORMATION (DEC 1991)
(a) The Contractor shall not release to anyone outside the Contractor's organization any unclassified information, regardless of medium (e.g., film, tape, document), pertaining to any part of this contract or any program related to this contract, unless-
(1) The Contracting Officer has given prior written approval; or
(2) The information is otherwise in the public domain before the date of
release.

(b) Requests for approval shall identify the specific information to be released, the medium to be used, and the purpose for the release. The Contractor shall submit its request to the Contracting Officer at least 45 days before the proposed date for release.

(c) The Contractor agrees to include a similar requirement in each subcontract under this contract. Subcontractors shall submit requests for authorization to release through the prime contractor to the Contracting Officer.
(End of clause)

The text of this and other contracting clauses that may be used can be found at http://farsite.hill.af.mil

If included in a contract, this clause requires that the release of any data or other information, including unclassified data and information, must be approved by the U.S. Air Force before release. This includes conference papers, journal articles, and extended abstracts or other short documents submitted to conference planners. The clause applies to subcontractors. While the clause requires the contractor to submit the request 45 days prior to the proposed date for release, approval is often obtained in three weeks.

IV. Requirement to Acknowledge Financial Support by U.S. Air Force in Publications

The contract will likely contain DFAR clause 252.235-7010, Acknowledgment of Support and Disclaimer.

As prescribed in [DFAR] 235.071(c), use the following clause:

ACKNOWLEDGMENT OF SUPPORT AND DISCLAIMER (MAY 1995)
(a) The Contractor shall include an acknowledgment of the Government's support in the publication of any material based on or developed under this contract, stated in the following terms: This material is based upon work supported by the (name of contracting agency(ies)) under Contract No. (Contracting agency(ies) contract number(s)).

(b) All material, except scientific articles or papers published in scientific journals, must, in addition to any notices or disclaimers by the Contractor, also contain the following disclaimer: Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of
the (name of contracting agency(ies)).
(End of clause)

The text of this and other contracting clauses that may be used can be found at http://farsite.hill.af.mil

This clause precludes the release of data or other information without government approval by omitting reference to support by the U.S. Air Force.

V. Disclaimer

Nothing in the additional information can supersede, abrogate, or alter the solicitation. Should anything in the additional information conflict with the solicitation, the formal solicitation takes precedence.
VI. PLEASE NOTE that the Air Force SBIR 07.1 Proposal Submission Instructions state, "Phase I proposals have a 20 page-limit (excluding the cost proposal and Company Commercialization Report)." Although the DoD instructions state the limit is 25 pages, proposals for Air Force topics will need to follow the guidelines under the AF submission instructions.


VII. PLEASE NOTE that the Air Force SBIR 07.1 Proposal Submission Instructions state, "The Phase I award winners must accomplish the majority of their primary research during the first six months of the contract. Each Air Force organization may request Phase II proposals prior to the completion of the first six months of the contract based upon an evaluation of the contractor's technical progress and review by the Air Force Technical point of contact utilizing the criteria in section 4.3 of the DoD solicitation."

Questions and Answers:

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