This paper presents the design and simulation of a resonating free liquid-piston compressor (FLPC) equipped with a separated combustion chamber. The FLPC is a proposed device that utilizes combustion of a hydrocarbon fuel to compress air into a high-pressure supply tank, thus potentially serving as a portable power supply candidate for untethered pneumatic systems of human-scale power. The ener...

A one-dimensional hybrid numerical model is presented of a shallow-water flume with an incorporated piston paddle. The hybrid model is based on the improved Boussinesq equations by Madsen and Sørensen (1992) and the nonlinear shallow water equations. It is suitable for breaking and non-breaking waves and requires only two adjustable parameters: a friction coefficient and a wave breaking paramet...

This paper is devoted to study the effects of pressure drop in heat exchangers on the dynamics of a free piston Stirling engine. First, the dynamic equations governing the pistons as well as the gas pressure equations for hot and cold spaces of the engine are extracted. Then, by substituting the obtained pressure equations into the dynamic relationships the final nonlinear dynamic equations gov...

In this paper a full transient 3-D CFD model of a complete single piston compressor system along with dynamic inlet and outlet port flip valves is presented. The model includes the motion of the cam driven piston, and also predicts the motion of the dynamic flip valves. All activities related to model creation, simulation and postprocessing were performed within the simulation software Simerics...

This paper proposes a nonlinear observer for an electropneumatic clutch actuator. Parameter estimation of the clutch load characteristic and friction are also treated through adaptation. Estimates of piston velocity, chamber pressures and dynamic friction state are made based on piston position measurement only. Persistence of excitation conditions for convergence of the estimation error are de...

The Rolls-Royce Merlin engines were a series of 12 cylinder, 60° "V", 27 litre, liquid cooled piston aircraft engines built during World War II by Rolls-Royce, and under licence in the United States by Packard. They are widely considered to be among the most successful aero engines produced during World War II, and perhaps the finest piston engines ever built for aviation. Merlins are highly so...

This paper presents a reciprocating air microcompressor with a piston diameter of 1 mm. A microcompressor construction is proposed aiming at simple fabrication with lots of space for installing inlet and outlet ports. The inlet port of the microcompressor does not have a moving valve, while the outlet port is equipped with a miniature reed valve. The compression process was numerically modelled...