Experimental study on mechanical power generation from MEMS internal combustion engine

The Future of Energy Storage Systems

“…They simulated the miniaturization limits of a standard ICE with a rotation speed of 48000 rpm, a gap width of 10 um and a compression rate larger than 18 and they found a minimum size limit between 0.3 and 0.4 cc. This limit has already been passed by [62] which has developed a microfabricated standard ICE of 5mmOE3mmOE1mm in dimension (0.015 cc) supplied by a mixture of Hydrogen and Oxygen, able to generate a mechanical power of 29.1mW. However, the tests of this silicon engine were performed at 3 rpm and it has shown a compression ratio around 1.4.…”

Estimation of parasitic losses in a proposed mesoscale resonant engine: Experiment and model

“…16,17 To reduce frictional losses at small scale, engines based on the free piston engine concept operating on a two stroke principle are being developed. 7,18,19 Because the piston motion is unconstrained, free piston engines have numerous advantages over traditional reciprocating engines like fuel flexibility, simpler design, and reduced frictional losses. 7,20 The low frictional losses and pure linear motion of the piston may allow the engine to operate with no or little lubrication and thus reduce exhaust emissions.…”

“…These features have encouraged researchers to develop them at small scales. 18,21 However, at small scales, the issues of poor sealing and leakage losses become significant. For instance, Suzuki et al have found that in their MEMS internal combustion engine 18% of the total chamber mass is discharged from the engine as crevice flow leakage resulting in significant power loss.…”

“…For instance, Suzuki et al have found that in their MEMS internal combustion engine 18% of the total chamber mass is discharged from the engine as crevice flow leakage resulting in significant power loss. 18 A numerical study by Sher et al showed that when an engine of 1 cc size, with a leakage gap of 20 lm, operated at 24 000 rpm, there was a mass loss of 58% from the chamber. 22 A scaled up version of the engine to 10 cc volume, with leakage gap of 20 lm, operated at 24 000 rpm and had a mass loss of 17% of the total mass in the chamber.…”

Effect of Thermal Boundary Conditions on Propagation of Non-Equidiffusive Flames in Pipes

“…8 shows the time evolution of the scaled burning rate, the scaled flame surface area and the flame tip velocity. As it can be seen inFig.…”