Steam Engine Project Part 3

As research and development has progressed the ideal configuration of the flash steam engine has evolved. Although my primary focus has been based on the Four Cycle Steam Engine (Otto Steam Engine). Direct Injection is the preferred method used to run these types of engines. The DI valve that’s used in the applications features a variable lift mechanism, this is necessary in order to throttle such engines.

Initially very high pressure and or supercritical steam/water was injected into the engines. This did in fact work, but is not considered user friendly. High pressures are still used for the injected water, such as 2000psi hydrostatic pressure, derived from a pump, this is needed to maintain high rpm engine speed, the injected water does not contain super-critical energies, but is heated somewhat, such as to 400°f.

As development has progressed, a so-called hydrostatic water injection system is preferred, vs. supercritical water/steam injection. All of the original problems still apply, such as limited heating surface area of the piston cylinder area and latent heat barriers of the injected water. These problems are addressed using the aspiration and compression of the low pressure exhaust steam back into the engine. this happens during its intake stroke and at full compression stroke, this is the ideal time to release the injected water such as 2-15 degrees ATDC. Compressed full piston volume of dry/superheated steam is ideal for the water injection point into the mass. The superheated steam is needed to perform useful work in the engine cylinder according the Heat of rejection theory. (like a thermal battery)

Heat of rejection discovered a parameter that is a steam conservative function, not regenerative. (this is not a Rankine cycle steam engine, (4 cycle steam). A densification factor was observed from the compression stroke of the engine. This is inherent to the four-cycle steam-engine configuration. So the 4-cycle engine can aspire air and or steam and compress it as the engines are run.

With this mechanism it is very easy to pull exhaust steam thru a super-heater on its way back to the intake port of the engine. Remember this is not a closed cycle, some of the exhaust steam escapes to a condenser that is open to atmosphere, however 99.5 percent of the water is recovered by the cycle. Engine aspiration will draw as much live/saturated steam as needed to achieve conservation from an equalizer chamber or part of the exhaust manifold. This is not a direct closed cycle concept. Regeneration would be the case, if all the exhaust steam was heating a feed water circuit and this is not happening in the situation, however regeneration may be applied with the remaining steam to be condensed if desired. The exhaust steam that’s conserved by the process, remains steam and is not condensed. This is the important thing to realize. Alternately, the aspired steam is superheated by the external combustion chamber.

Classifying the engine as an Otto Cycle Steam Engine or a Flash Steam Engine, this is because the injected water is intended to flash into steam, in the cylinder, as a result of several inherent mechanisms the engine system employs, this injected water comes into direct contact with superheated steam compressed inside the engine cylinder, where the injected water meets steam, and may do so with high frequency intervals continuously overtime. This is possible because upon every intake stroke a fresh supply of superheated steam is provided for (intake stroke) that repeated interval, enabling flashsteam power-pulse to occur once every 720° of crankshaft rotation for its required duration, generally 95° crank rotation, depending on the expansion factor( volumetric eff of the piston cyl) or cutoff adjustments of the injected water.

<last update/06/17/13>

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