Development And Key Technology Research Of Small Stirling Triboelectric Generator System

The Stirling engine has the advantages of simple structure,stable operation,and the same theoretical thermodynamic efficiency as the Carnot cycle.It has broad application prospects for recovering small distributed low-level thermal energy,and is widely used in the comprehensive utilization of energy,reducing pollution emissions,sustainable development and many other aspects.Aiming at the characteristics of low-frequency power generation,low power,and linear motion of the free piston Stirling engine,this paper proposes a design scheme of coupling a free piston Stirling engine and a Triboelectric linear generator and the feasibility of this scheme was verified through experiments.The volume power density of the model engine in this paper reaches 30.53 W/m~3.The Bistable Triboelectric Linear Generator reached a peak volume power density of 877.8m W/m~3 at an excitation frequency of 6.1 HZ.The volume power density of the model engine proposed in this paper is increased by 34.78 times at a normal operating frequency of 50HZ.It can be seen from the output volume power density characteristics that the model engine designed in this paper has better power generation performance than traditional Triboelectric Linear Generator in low-frequency and low-power applications.After verifying the feasibility of the design scheme of the model machine,a small free piston Stirling engine is designed and processed in this paper to better couple the Triboelectric linear generator.Some of its key components such as regenerator,cooling cycle device,power output device are designed and processed,and finally complete assembly for start-up experiments.In view of the problem that the traditional sensor testing does not meet the experimental plan,this article uses a non-contact visual testing method to test the operation of the Stirling engine through stereo vision.This paper proposes a multi-camera calibration method capable of calibrating the intrinsic and extrinsic parameters of four cameras using only a single captured image per camera.The method proposed in this paper simplifies the calibration process and greatly enhances the rapidity and robustness of calibration.The non-contact visual testing method is used to track the feature points to quickly obtain the three-dimensional motion information of the Stirling engine piston.