Method and system for locating critical flow feature indicators in three dimensional flow regimes
First Claim
1. A method for locating two dimensional critical flow features on a surface of a three dimensional body immersed in a fluid stream, the method comprising:
- applying a hot film sensor array on the surface of the body, the hot film sensor array comprising a plurality of hot film sensor elements disposable over at least a portion of the body surface in two dimensions with respect to the body surface, each sensor element being connected to an associated anemometer circuit to provide an output voltage;
obtaining output voltage data for each hot film sensor element with the body immersed in the fluid stream under a set of flow conditions; and
processing the hot film sensor element output voltage data to locate at least one two dimensional critical flow feature on the body surface.
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Abstract
A method for locating two dimensional critical flow features on a surface of a three dimensional body immersed in a fluid stream is presented. The method comprises applying a hot film sensor array on the surface of the body. The hot film sensor array comprises a plurality of hot film sensor elements disposable in a two dimensional array over at least a portion of the body surface. Each sensor element is connected to an associated anemometer circuit to provide an output voltage. The method further comprises obtaining output voltage data for each hot film sensor element with the body immersed in the fluid stream under a set of flow conditions and processing the hot film sensor element output voltage data to locate at least one two dimensional critical flow feature on the body surface.
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Citations
44 Claims
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1. A method for locating two dimensional critical flow features on a surface of a three dimensional body immersed in a fluid stream, the method comprising:
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applying a hot film sensor array on the surface of the body, the hot film sensor array comprising a plurality of hot film sensor elements disposable over at least a portion of the body surface in two dimensions with respect to the body surface, each sensor element being connected to an associated anemometer circuit to provide an output voltage;
obtaining output voltage data for each hot film sensor element with the body immersed in the fluid stream under a set of flow conditions; and
processing the hot film sensor element output voltage data to locate at least one two dimensional critical flow feature on the body surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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11. A method according to 10 wherein the action of determining whether the flow bifurcation line is an attachment line or a separation line includes:
comparing voltage data for hot film sensor elements on one side of the flow bifurcation line with the voltage data for hot film sensor elements on the opposite side of the flow bifurcation line.
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24. An automated system for locating two-dimensional critical flow features on a surface of a three dimensional body immersed in a fluid stream, the system comprising:
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a hot film sensor arrangement comprising a plurality of hot film sensor elements appliable over at least a portion of the body surface in two dimensions with respect to the body surface;
an anemometer circuit arrangement having a plurality of anemometer circuits, each anemometer circuit being in communication with an associated hot film sensor element and being configured to provide a sensor signal corresponding to heat transfer from the associated hot film sensor to the fluid stream; and
a data processing system in communication with the anemometer arrangement, the data processing system including a signal receiving portion in communication with the anemometer arrangement, the signal receiving portion being adapted for receiving and processing sensor signals from the anemometer circuits and a critical flow feature mapping portion in communication with the signal receiving portion, the critical flow feature mapping portion being adapted for processing the sensor signals to determine the location of at least one critical flow feature line on the body surface. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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33. An automated system for locating two-dimensional critical flow features on a surface of a three dimensional body immersed in a fluid stream, the system comprising:
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a hot film sensor arrangement comprising a plurality of hot film sensor elements appliable over at least a portion of the body surface in two dimensions with respect to the body surface;
sensor data acquisition means for obtaining output voltage data for each hot film sensor element with the body immersed in the fluid stream under a set of flow conditions; and
sensor data processor means for processing the hot film sensor element output voltage data to locate at least one critical flow feature line on the body surface. - View Dependent Claims (34, 35, 36, 37, 38, 40, 41, 42, 43, 44)
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39. An automated system according to 38 wherein the means for determining whether the flow bifurcation line is an attachment line or a separation line is adapted to compare voltage data for hot film sensor elements on one side of the flow bifurcation line with the voltage data for hot film sensor elements on the opposite side of the flow bifurcation line.
Specification