Investigation on hot fluid based actuation of SMA spring and their application for the development of heat engine

Verma, Akhil; Anand, K.; Hari, V. M.; Nath, T. Ranga; Palani, I. A.

doi:10.1063/1.5058259

Cited by 4 publications

(4 citation statements)

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“…When the springs pass through the hot water, they contract, and when they come out of the water, they will be cooled by cold air and extend, thus rotate the engine. Also, Verma et al designed a NiTi SMA crank offset center heat engine [87] for the purpose of using exhaust gas from the vehicle as a heat source. The engine is shown in figure 15.…”

Section: Crank Enginementioning

confidence: 99%

“…Usually, cold air is used for cooling. Verma et al used this method to drive their SMA crank heat engine [87]. Exhaust hot gas from the vehicle was used for heating while the surrounding cold air was used for cooling, as in Browne et al engine [26].…”

Section: (A) Hot Water and Cold Watermentioning

confidence: 99%

“…According to this research, factors like heating and cooling rate, and SMA wire size, determines the final output power. Verma et al presented a crank NiTi SMA heat engine that was able to generate 0.3 W of power at an engine speed of 165 rpm using vehicle exhaust gas as a heat source [87]. When hot water was used in the second experiment as a source of heat, the engine performance was reduced with the highest speed of 46 rpm.…”

Section: Efficiency and Thermodynamics Thermal Recovery Of The Sma He...mentioning

confidence: 99%

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A review on Nitinol shape memory alloy heat engines

Abubakar

Wang

2020

Smart Mater. Struct.

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Nitinol (NiTi) shape memory alloy (SMA) heat engine is a very promising candidate application of SMA since its invention, but yet to be put as commercial due to its low efficiency and performance. In this paper, a review of different types of NiTi SMA heat engine is presented. The review is done based on the following headings: conceptual design, constitutive driving model, the performance of the engine, and engine limitations. Factors like temperature, cooling rate, size of NiTi SMA element, and the stretch ratio of NiTi SMA spring were identified as determinants of final output power and efficiency of SMA heat engines. It is found that a crankshaft NiTi SMA heat engine produced the highest power output value of 4 watt, an unsynchronized pulley NiTi SMA heat engine with 11.3% of engine efficiency has the highest engine performance so far recorded. Some engine's drawbacks like an improper driving model, drag loss, backsliding were identified as the major problem affecting the engine performance, and which, if solved, will increase the overall performance and efficiency for future development toward its commercialization.

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Section: Crank Enginementioning

confidence: 99%

Section: (A) Hot Water and Cold Watermentioning

confidence: 99%

Section: Efficiency and Thermodynamics Thermal Recovery Of The Sma He...mentioning

confidence: 99%

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A review on Nitinol shape memory alloy heat engines

Abubakar

Wang

2020

Smart Mater. Struct.

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“…In the axis-center crank engine (Iwanaga et al, 1988; Zhu et al, 2001b), there are two crankshafts, and the SMA elements are connected to the crankshaft at different positions along the shaft. In the offset-center crank engine (Tobushi et al, 2000; Verma et al, 2018), the engine has a flywheel with several SMA wire loops connected to the spokes of the offset wheel-hub. The eccentricity of the hub causes the SMA wire to stretch more on one side of the wheel than the other side.…”

Section: Introductionmentioning

confidence: 99%

Differential equation model of shape memory alloy spring and its application in heat engines

Wang

2022

Journal of Intelligent Material Systems and Structures

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In order to use low-grade thermal sources more efficiently, different types of Shape Memory Alloy (SMA) heat engines have been proposed and studied, but the lack of a robust constitutive model is still an open issue. In the current paper, the SMA spring model is constructed by combining the mechanical spring theory and the SMA differential equation model. This model can describe the characteristics of SMA springs well, so it is used for SMA heat engine modeling. The state of the SMA heat engine under different loads is calculated, and the output of the SMA heat engine can also be calculated and compared with its experimental value. The calculated rotation speed and output power of the SMA heat engine are in good agreement with the experimental values, which illustrates the superiority of the proposed model and provides a method for the simulation, design, and optimization of the SMA heat engine.

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