Instantaneous de-icing of freezer ice via ultrasonic actuation

Jose Palacios; Edward Smith; Joseph Rose; Roger Royer

doi:10.2514/1.J050143

Instantaneous de-icing of freezer ice via ultrasonic actuation

Jose Palacios, Edward Smith, Joseph Rose, Roger Royer

Research output: Contribution to journal › Article › peer-review

85 Scopus citations

Abstract

A low-power, nonthermal, ultrasonic de-icing system is introduced as a potential de-icing system for helicopter rotor blades. In this research effort, ultrasonic actuators excite isotropic plates and airfoil-shaped structures that are representative of helicopter leading-edge protection caps. The system generates delaminating ultrasonic transverse shear stresses at the interface of accreted ice, debonding thin ice layers (less than 3 mm thick) as they form on the isotropic host structure.Afinite element model of the proposed actuator and the isotropic structures with accreted ice guides the selection of the actuator prototypes. Several actuator-isotropic plate structures are fabricated and tested under freezer ice conditions. Test results demonstrate that radial resonance disk actuators (28-32 kHz) create ultrasonic transverse shear stresses capable of instantaneously delaminating ice layers. The finite element modeling predicts the delamination patterns of the accreted ice layers. Models also predict (within 15%) the required input voltage to promote instantaneous ice debonding. At environment temperatures of -20°C, the system delaminates 2.5-mm-thick ice layers with power input densities as low as 0:07 W=cm ² (0:5 W=in:²).

Original language	English (US)
Pages (from-to)	1158-1167
Number of pages	10
Journal	AIAA journal
Volume	49
Issue number	6
DOIs	https://doi.org/10.2514/1.J050143
State	Published - Jun 2011

All Science Journal Classification (ASJC) codes

Aerospace Engineering

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10.2514/1.J050143

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title = "Instantaneous de-icing of freezer ice via ultrasonic actuation",

abstract = "A low-power, nonthermal, ultrasonic de-icing system is introduced as a potential de-icing system for helicopter rotor blades. In this research effort, ultrasonic actuators excite isotropic plates and airfoil-shaped structures that are representative of helicopter leading-edge protection caps. The system generates delaminating ultrasonic transverse shear stresses at the interface of accreted ice, debonding thin ice layers (less than 3 mm thick) as they form on the isotropic host structure.Afinite element model of the proposed actuator and the isotropic structures with accreted ice guides the selection of the actuator prototypes. Several actuator-isotropic plate structures are fabricated and tested under freezer ice conditions. Test results demonstrate that radial resonance disk actuators (28-32 kHz) create ultrasonic transverse shear stresses capable of instantaneously delaminating ice layers. The finite element modeling predicts the delamination patterns of the accreted ice layers. Models also predict (within 15%) the required input voltage to promote instantaneous ice debonding. At environment temperatures of -20°C, the system delaminates 2.5-mm-thick ice layers with power input densities as low as 0:07 W=cm 2 (0:5 W=in:2).",

author = "Jose Palacios and Edward Smith and Joseph Rose and Roger Royer",

note = "Funding Information: The authors would like to thank Bell Helicopters, a Textron Company, and the U.S. Army for sponsoring this research. This research is partially funded by the Government under agreement no. W911W6-06-2-0008 and by FBS Worldwide, Inc. Thanks to Aviation Applied Technology Directorate Phase I Small Business Innovation Research contract no. W911W6-08-C-0019. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the U.S. Government.",

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N2 - A low-power, nonthermal, ultrasonic de-icing system is introduced as a potential de-icing system for helicopter rotor blades. In this research effort, ultrasonic actuators excite isotropic plates and airfoil-shaped structures that are representative of helicopter leading-edge protection caps. The system generates delaminating ultrasonic transverse shear stresses at the interface of accreted ice, debonding thin ice layers (less than 3 mm thick) as they form on the isotropic host structure.Afinite element model of the proposed actuator and the isotropic structures with accreted ice guides the selection of the actuator prototypes. Several actuator-isotropic plate structures are fabricated and tested under freezer ice conditions. Test results demonstrate that radial resonance disk actuators (28-32 kHz) create ultrasonic transverse shear stresses capable of instantaneously delaminating ice layers. The finite element modeling predicts the delamination patterns of the accreted ice layers. Models also predict (within 15%) the required input voltage to promote instantaneous ice debonding. At environment temperatures of -20°C, the system delaminates 2.5-mm-thick ice layers with power input densities as low as 0:07 W=cm 2 (0:5 W=in:2).

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Instantaneous de-icing of freezer ice via ultrasonic actuation

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