Experimental Investigation of a Novel Single Cylinder Free Piston Expander-linear Generator

doi:10.3969/j.issn.1000-1093.2018.11.002

Abstract

Abstract: A single cylinder free piston expander-linear generator (FPE-LG) used for organic Rankine cycle (ORC) waste heat recovery system is developed to improve the energy efficiency of the internal combustion engines. FPE-LG can operate continuously and stably under the condition of high driven pressure, which indicates that the working principle of single cylinder FPE-LG is feasible. The effects of driven pressure and external load resistance on the output characteristics of single cylinder FPE-LG are investigated through experiment. The experimental test results show that the power output of FPE-LG exhibits a regular sinusoidal fluctuation, and the peak power output can reach 58.7 W when the driven pressure is 0.6 MPa and the external load resistance is 50 Ω. The increase in driven pressure can increase the RMS voltage and peak current significantly. However, it has little effect on the power-electric conversion efficiency of FPE-LG. When the external load resistance is less than 60 Ω, the power-electric conversion efficiency η of FPE-LG increases from 13.4% to 24.7% with the increase in external load resistance. When the external load resistance is 60 Ω, actual expansion work (AEW), W_AEW, of the single cylinder FPE-LG is the largest and the power-electric conversion efficiency is the best. The continuous increase in the external load resistance value has little effect on W_AEW and η. Key

Key words: freepistonexpander-lineargenerator, singlecylinder, wasteheatrecovery, power-electricconversionefficiency, performanceexperiment

CLC Number:

TK115

TIAN Ya-ming, ZHANG Hong-guang, LI Jian, ZHAO Teng-long, WANG Yan. Experimental Investigation of a Novel Single Cylinder Free Piston Expander-linear Generator[J]. Acta Armamentarii, 2018, 39(11): 2092-2099.

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第39卷第11期
2018 年11月兵工学报ACTA
ARMAMENTARIIVol.39No.11Nov. 2018