Plant leaf-mimetic smart wind turbine blades by 4D printing

Momeni, Farhang; Sabzpoushan, Seyedali; Valizadeh, Reza; Morad, Mohammad Reza; Liu, Xun; Ni, Jun

doi:10.1016/j.renene.2018.05.095

Cited by 72 publications

(43 citation statements)

References 73 publications

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“…The deformation of thermo-responsive materials is mainly driven by one of two mechanisms: the shape memory effect (SME) [63] or the shape change effect (SCE) [64]. Materials based on the SME are called shape memory materials (SMM) which can be further divided into shape memory alloys (SMA), shape memory polymers (SMP), shape memory hybrids (SMH), shape memory ceramics (SMC) and shape memory gels (SMG) [33]. SMPs are the most favored by researchers for their ease of printability.…”

Section: Thermo-responsivementioning

confidence: 99%

Developments in 4D-printing: a review on current smart materials, technologies, and applications

Zhang

Demir

2019

International Journal of Smart and Nano Materials

263

127

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Recent advances in additive manufacturing (AM), commonly known as three-dimensional (3D)-printing, have allowed researchers to create complex shapes previously impossible using traditional fabrication methods. A research branch that originated from 3D-printing called four-dimensional (4D)-printing involves printing with smart materials that can respond to external stimuli. 4Dprinting permits the creation of on-demand dynamically controllable shapes by integrating the dimension of time. Recent achievements in synthetic smart materials, novel printers, deformation mechanism, and mathematical modeling have greatly expanded the feasibility of 4D-printing. In this paper, progress in the 4Dprinting field is reviewed with a focus on its practical applications. We discuss smart materials developed using 4D-printing with explanations of their morphing mechanisms. Additionally, case studies are presented on self-constructing structures, medical devices, and soft robotics. We conclude with challenges and future opportunities in the field of 4D-printing.

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Section: Thermo-responsivementioning

confidence: 99%

Developments in 4D-printing: a review on current smart materials, technologies, and applications

Zhang

Demir

2019

International Journal of Smart and Nano Materials

263

127

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“…Alternatively, the bending can be characterized by the deflection of the post into the xy plane. This measure is useful for designing posts that could simultaneously guide and sustain fluid flow in a microchamber, in analogy with effective wind blades (35) that are bent and subtly twisted to optimize air flow. Using this second metric, the post with the vertically oriented director on the bottom (case 1; Fig.…”

Section: Posts Encompassing Two Distinct Director Orientationsmentioning

confidence: 99%

Twist again: Dynamically and reversibly controllable chirality in liquid crystalline elastomer microposts

Waters

Yao

et al. 2020

Sci. Adv.

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Photoresponsive liquid crystalline elastomers (LCEs) constitute ideal actuators for soft robots because their lightinduced macroscopic shape changes can be harnessed to perform specific articulated motions. Conventional LCEs, however, do not typically exhibit complex modes of bending and twisting necessary to perform sophisticated maneuvers. Here, we model LCE microposts encompassing side-chain mesogens oriented along a magnetically programmed nematic director, and azobenzene cross-linkers, which determine the deformations of illuminated posts. On altering the nematic director orientation from vertical to horizontal, the post's bending respectively changes from light-seeking to light-avoiding. Moreover, both modeling and subsequent experiments show that with the director tilted at 45°, the initially achiral post reversibly twists into a right-or left-handed chiral structure, controlled by the angle of incident light. We exploit this photoinduced chirality to design "chimera" posts (encompassing two regions with distinct director orientations) that exhibit simultaneous bending and twisting, mimicking motions exhibited by the human musculoskeletal system.

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“…The fresh airfoil geometry and wind turbine blade approach was implemented Small changes on small wind turbine blades operating at less than 500,000 Reynolds, blade parameters such as pitch angle, chord and twist distribution were also discussed .The 4D printing method has proved a fresh paradigm for the design and manufacture of wind turbine blades. [11][12]. Airfoil SG 6043 has been chosen in their research.…”

Section: E Small Wind Turbine Rotor Bladesmentioning

confidence: 99%

Design and Fabrication of Small Horizontal axis wind Turbine Rotors at Low Reynolds Number

Chaudhary*¹,

Subramanian²

2019

IJITEE

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This research paper presents a design and fabrication of 100 Watt small horizontal axis wind turbine with 0.24 m and 0.35 m rotor radius and tip speed ratio varies from 2 to 10 was designed and development for operated at low wind speed with Low Reynolds number. In this paper, a new airfoil profile was designed and developed, it's denoted by MK115. The numerical and experimental analysis for 6 airfoils using Xfoil software was conducted with a view to evaluating the lift-to-drag ratio and angle of attack by means of the SD7024, SG6043, NACA2412, S1210, E213, and New Airfoil (MK115) tested. In simulation, new MK115 airfoil was the most convenient airfoil to start high energy production for low-wind applications, on the Reynolds number 25000, 50000, 75000, and 100000 in improved airfoil (MK115) Lmax of 0.92, 1.25, 1.69, 1.67 at Re=25k, 50k, 75k and 100k for an angle of attack is equal to 10 0 .A maximum lift to drag ratio (Cl/Cd) of 7,16,50,63 at Re=25k, 50k, 75k and 100k for New airfoil (MK115) at angle of attack (α) =4 0 , 4 0 , 8 0 , 8 0 . SG6043, NACA2412, E214, SD7034, S1210 and MK115 (New airfoil) have the Maximum C p =0.37, 0.36, 0.4, 0.39, 0.44, and 0.44 at tip speed ratio (λ) =6 for Reynolds number is equal to 100000. MK115, Maximum Torque obtained 0.9744 Nm, 1.389 Nm and 2.4866 Nm at blade angle =0, 15 and 30 degrees respectively. Power coefficient (Cp) =0.51, 0.5, 0.46, and 0.4 at Rotor shaft angle=0 0 , 5 0 , 10 0 , and 15 0 respectively for the new airfoil results. tests an Open type wind tunnel. An Xfoil analysis to obtain further data on the flow characteristics was also conducted. (MK115) airfoil have C

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Plant leaf-mimetic smart wind turbine blades by 4D printing

Cited by 72 publications

References 73 publications

Developments in 4D-printing: a review on current smart materials, technologies, and applications

Developments in 4D-printing: a review on current smart materials, technologies, and applications

Twist again: Dynamically and reversibly controllable chirality in liquid crystalline elastomer microposts

Design and Fabrication of Small Horizontal axis wind Turbine Rotors at Low Reynolds Number

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