Abstract
In this paper, the friction characteristics of a novel Linear Joule Engine Generator operating on dry friction mechanism is presented. A numerical model of the friction forces is represented through the development of a dry friction force model integrated into a mass-spring-damper system with viscous damping and spring constant to emulate compressor and expander operating pressures. Experimental results from a Linear Joule Engine Generator prototype are compared with the numerical simulation results predicted by the proposed friction model and other reported friction models identified from the wider engineering literature. Finally, the relationship between electric generator load and friction power of Linear Joule Engine Generator is established.
Highlights
The Linear-Joule Engine Generator (LJEG) combines the principles of Reciprocating Joule Cycle Engines (RJE) and Free-Piston Linear Electric Generators (FPLEG)
The results showed that thermal efficiency is proportional to operating pressure ratio and peak temperature
The results showed that friction force from piston ring – cylinder liner interface can be higher in Free Piston Engine (FPE) than in crankshaft engines
Summary
The Linear-Joule Engine Generator (LJEG) combines the principles of Reciprocating Joule Cycle Engines (RJE) and Free-Piston Linear Electric Generators (FPLEG). There has been growing research interest on reciprocating Joule cycle engines for combined heat and power (CHP) and microscale electric power generation applications. Bell and Partridge [5], constructed a thermodynamic model of a reciprocating Joule cycle engine incorporating external combustor, with traditional crankshaft mechanism. Researchers from the authors’ group [6] considered a reciprocating Joule cycle engine for CHP application with crankshaft mechanism and a recuperator. The results showed that thermal efficiency is proportional to operating pressure ratio and peak temperature. A similar study [7] by researchers in France explored a static model of Joule engine with an external heat source for CHP application, a peak temperature of 650 °C and a pressure ratio of 6.0 were achieved at a thermal efficiency of 37.6%. A study on a dynamic model of open Joule cycle low-speed two-stroke engine for micro co-generation systems, Applied Energy 237 (2019) 49–59
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